Process for Producing Broader Molecular Weight Distribution Polymers with a Reverse Comonomer Distribution and Low Levels of Long Chain Branches

The present invention provides a polymerization process which is conducted by contacting an olefin monomer and at least one olefin comonomer in the presence of hydrogen and a metallocene-based catalyst composition. Polymers produced from the polymerization process are also provided, and these polymers have a reverse comonomer distribution, low levels of long chain branches, and a ratio of Mw/Mn from about 3 to about 6.

Borohydride Metallocene Complex of a Lanthanide, Catalytic System Including Said Complex, Polymerization Method Using Same and Ethylene/Butadiene Copolymer Obtained Using Said Method

Borohydride metallocene complex of lanthanide, preparation process, catalytic system incorporating borohydride metallocene complex, process for copolymerization of olefins employing catalytic system. The complex corresponds to one or other of formulae A and B: where, in A, two ligands Cp 1 , Cp 2 , each composed of a cyclopentadienyl group, are connected to the lanthanide Ln, such as Nd, and where, in B, a ligand molecule, composed of two cyclopentadienyl groups Cp 1 , Cp 2 connected to one another via a bridge P of formula MR 1 R 2 , M is an element from group IVa, and R 1 and R 2 , which are identical or different, represent an alkyl group comprising from 1 to 20 carbon atoms, is connected to the lanthanide Ln, L is alkali metal, N is molecule of a complexing solvent, x is integral or non-integral number≧0, p is integer≧than 1 and y is integer≧0.

Method for producing copolymer

This invention relates to a method for producing a copolymer of a conjugated diene compound and an unconjugated olefin other than the conjugated diene compound having a high cis-1,4 bond content of a conjugated diene compound portion, and more particularly to a method for producing a copolymer characterized by comprising a step of polymerizing a conjugated diene compound and an unconjugated olefin other than the conjugated diene compound in the presence of a polymerization catalyst composition including at least one complex selected from a metallocene complex represented by the following general formula (I): (wherein M is a lanthanoid element, scandium, or yttrium, and Cp R is independently a non-substituted or substituted indenyl, and R a -R f are independently an alkyl group having a carbon number of 1-3 or a hydrogen atom, and L is a neutral Lewis base, and w is an integer of 0-3) and so on.

Halogen Substituted Heteroatom-Containing Metallocene Compounds for Olefin Polymerization

Halogen substituted metallocene compounds are described and comprise one or more monocyclic or polycyclic ligands that are pi-bonded to the metal atom and include at least one halogen substituent directly bonded to an sp 2 carbon atom at a bondable ring position of the ligand, wherein the or at least one ligand has one or more ring heteroatoms in its cyclic structure. When combined with a suitable activator, these compounds show activity in the polymerization of olefins, such as ethylene and propylene.

Polyolefins Prepared from a Metallocene and a New Single Site Catalyst Components in a Single Reactor

The present invention discloses a catalyst system based on a metallocene catalyst component and a new single site catalyst component for the production in a single reactor of improved polyolefins having a bimodal molecular weight distribution.

Catalysts

The present invention relates to novel metallocene catalysts of formula I, which is defined herein. The present invention also provides processes for making these catalysts and their use in olefin polymerisation reactions.

Modified phosphinimine catalysts for olefin polymerization

Olefin polymerization is carried out with a supported phosphinimine catalyst which has been treated with a long chain substituted amine compound.

High Activity Catalyst Compositions Containing Silicon-Bridged Metallocenes with Bulky Substituents

The present invention discloses catalyst compositions employing silicon-bridged metallocene compounds with bulky substituents. Methods for making these silicon-bridged metallocene compounds and for using such compounds in catalyst compositions for the polymerization of olefins also are provided.

Semi continuous process for the synthesis of a catalyst for use in the manufacture of polyolefins

A semi-continuous process and system thereof, for the synthesis of a narrow particle size distribution Zeigler Natta procatalyst for use in the manufacture of polyolefins. The process comprises: (a) mixing a reaction mixture containing a titanium compound; (b) charging a first reactor with said reaction mixture; (c) removing excess reactants from said first reactor as a filtrate; (d) feeding said filtrate to at least one further reactor; and continuously removing excess reactants from said at least further reactor.

Polymerization Process for Producing Bimodal Polymers

Catalyst compositions comprising a first metallocene compound, a second metallocene compound, an activator-support, and an organoaluminum compound are provided. An improved method for preparing cyclopentadienyl complexes used to produce polyolefins is also provided.

Ethylene-based terpolymer having high elasticity and preparation method thereof

The present invention relates to an ethylene-based terpolymer having high elasticity and a preparation method thereof, and more particularly, to a highly elastic, ethylene-based terpolymer, which comprises a specific molar ratio of a ethylene unit, a C 6-12 α-olefin unit and at least one functional unit selected from the group consisting of divinylbenzene and para-methylstyrene and to a method of preparing the highly elastic, ethylene-based terpolymer using a metallocene catalyst.

Method for producing a water-absorbent resin

A method for producing a water-absorbent resin having a further reduced odor as compared with a water-absorbent resin obtained by a conventional method as well as a water-absorbent resin produced by the same method, by maintaining the addition rate V from the pouring nozzle for the aqueous solution of the water-soluble ethylenically unsaturated monomer in a polymerization reaction tank not more than 0.30 [min −1 ], in the first stage polymerization step which is within the step of the conventional method upon performing multi-stages such as two or more stages of reversed-phase suspension polymerizations in a method for producing a water-absorbent resin, and thereby by being able to reduce the amount of the petroleum hydrocarbon dispersion medium remaining in the above water-absorbent resin.

Ti catalyst systems comprising substituted cyclopentadienyl, amidine and diene ligand

The invention relates to a catalyst system for the polymerization of olefins comprising a metal complex of formula CyLMD and an activating cocatalyst, wherein M is titanium, Cy is a cyclopentadienyl-type ligand, D is a diene, L is an amidinate-containing ligand of formula (1), wherein the amidinate-containing ligand is covalently bonded to the titanium via the imine nitrogen atom, Sub 1 is a substituent, which comprises a group 14 atom through which Sub 1 is bonded to the imine carbon atom, Sub 2 is a substituent, which comprises a nitrogen atom, through which Sub 2 is bonded to the imine carbon atom, and Cy is a mono- or polysubstituted cyclopentadienyl-type ligand, wherein the one or more substituents of Cy are selected from the group consisting of halogen, hydrocarbyl, silyl and germyl residues, optionally substituted with one or more halogen, amido, phosphido, alkoxy, or aryloxy residues. The invention further relates to a process for the preparation of a polymer comprising at least one aliphatic or aromatic hydrocarbyl C 2-20 olefin wherein the at least one aliphatic or aromatic olefin is contacted with the catalyst system of the present invention.

Method for preparing polypropylene using transition metal compound containing thiophene-fused cyclopentadienyl ligand

The present invention relates to a preparation method for polypropylene that comprises polymerizing a propylene monomer in the presence of a catalyst comprising a novel transition metal compound. Using the novel transition metal compound as a catalyst, the preparation method for polypropylene according to the present invention can not only acquire high catalytic activity for polymerization to achieve high efficiency of the process but allow it to easily control the fine-structure characteristics of the polymer, thereby providing polypropylene having desired properties with ease.

Process for olefin polymerisation using group 4 metallocene as catalysts

A process for the preparation of a random propylene copolymer comprising polymerising propylene and at least one C2-10 alpha olefin (especially ethylene) in the presence of a catalyst; wherein said catalyst comprises: (i) a complex of formula (I): wherein M is zirconium or hafnium; each X is a sigma ligand; L is a divalent bridge selected from —R′ 2 C—, —R′ 2 C—CR′ 2 —, —R′ 2 Si—, —R′ 2 Si—SiR 2 —, —R′ 2 Ge—, wherein each R′ is independently a hydrogen atom, C1-C20-hydrocarbyl, tri(C1-C20-alkyl)silyl, C6-C20-aryl, C7-C20-arylalkyl or C7-C20-alkylaryl; each R 1 is a C4-C20 hydrocarbyl radical branched at the β-atom to the cyclopentadienyl ring, optionally containing one or more heteroatoms belonging to groups 14-16, or is a C3-C20 hydrocarbyl radical branched at the β-atom to the cyclopentadienyl ring where the β-atom is an Si-atom; n is 0-3; each R 18 is the same or different and may be a C1-C20 hydrocarbyl radical optionally containing one or more heteroatoms belonging to groups 14-16; each R 4 is a hydrogen atom or a C1-6-hydrocarbyl radical; each W is a 5 or 6 membered aryl or heteroaryl ring wherein each atom of said ring is optionally substituted with an R 5 group; each R 5 is the same or different and is a C1-C20 hydrocarbyl radical optionally containing one or more heteroatoms belonging to groups 14-16; and optionally two adjacent R 5 groups taken together can form a further mono or multicyclic ring condensed to W optionally substituted by one or two groups R 5 ; and (ii) a cocatalyst comprising an organometallic compound of a Group 13 metal.

Cyclopenta[b]Fluorenyl Transition Metal Compound, Catalyst Composition Containing the Same, and Method of Preparing Ethylene Homopolymer or Copolymer of Ethylene and alpha-Olefin Using the Same

The present invention relates to a new transition metal compound based on cyclopenta[b]fluorenyl group, a transition metal catalyst composition containing the same and having high catalytic activity for preparing an ethylene homopolymer or a copolymer of ethylene and one α-olefin, a method of preparing an ethylene homopolymer or a copolymer of ethylene and α-olefin using the same, and the prepared ethylene homopolymer or the copolymer of ethylene and α-olefin.

Neodymium-catalyzed polybutadienes

The invention relates to a high-molecular-weight, linear, neodymium-catalysed polybutadiene having a high proportion, >95%, of cis-1,4 units having a low proportion, <1%, of 1,2-vinyl content, and also having a small molar-mass-polydispersity index (MPI), characterized in that Mooney viscosity (ML 1+4 100° C.) of the polybutadiene is from 70 to 90 and The molar-mass-polydispersity index of the polybutadiene is smaller than 10.

Advanced transition metal catalytic systems in terms of comonomer incorporations and methods for preparing ethylene homopolymers or copolymers of ethylene and alpha-olefins using the same

Provided is a homogeneous catalytic system for use in preparing an ethylene homopolymer or a copolymer of ethylene and α-olefin, and more particularly a Group 4 transition metal compound in which a cyclopentadienyl derivative 3,4-positions of which are substituted with alkyls and an electron-donating substituent are crosslinked around a Group 4 transition metal. Also provided is a method of preparing an ethylene homopolymer or a copolymer of ethylene and α-olefin, having high molecular weight, under high-temperature solution polymerization conditions using the catalytic system including such a transition metal compound and a co-catalyst composed of an aluminum compound, a boron compound or a mixture thereof. The catalyst according to present invention has high thermal stability and enables the incorporation of α-olefin, and is thus effective in preparing an ethylene homopolymer or a copolymer of ethylene and α-olefin, having various properties, in industrial polymerization processes.

Polyethylene and Process for Production Thereof

This invention relates to a process for polymerizing olefins in which the amount of trimethylaluminum in a methylalumoxane solution is adjusted to be from 1 to 25 mol %, prior to use as an activator, where the mol % trimethylaluminum is determined by 1 H NMR of the solution prior to combination with any support. This invention also relates to a process for polymerizing olefins in which the amount of an unknown species present in a methylalumoxane solution is adjusted to be from 0.10 to 0.65 integration units prior to use as an activator, where the amount of the unknown species is determined by the 1 H NMR spectra of the solution performed prior to combination with any support. Preferably, the methylalumoxane solution is present in a catalyst system also comprising a metallocene transition metal compound.

Expanded polypropylene resin particles, and polypropylene resin in-mold-expanded molding

Polypropylene resin expanded particles comprising: a polypropylene resin as a base material resin, the propylene resin having at least two melting peaks on a DSC curve for a second temperature rise measured at a heating rate of 10 g/min with use of a heat flux differential scanning calorimeter (DSC), the at least two melting peaks including (i) a lowest temperature melting peak of not lower than 100° C. and not higher than 130° C. and (ii) a highest temperature melting peak of not lower than 140° C. and not higher than 160° C., the propylene resin having a resin DSC ratio change rate of 0.5%/° C. to 3.0%/° C., the expanded particles having two melting peaks in a DSC measurement made at a first temperature rise at the heating rate of 10 g/min, the two melting peaks including, (i) on a lower temperature side, a melting peak temperature of not lower than 100° C. and not higher than 130° C. and, (ii) on a higher temperature side, a melting peak temperature of not lower than 140° C. and not higher than 160° C. allow an in-mold foaming molded product to be produced of expanded particles that (i) have only a small change in expanded particle DSC ratio, the change corresponding to a change in foaming temperature, (ii) allow production of an in-mold foaming molded product at a very low mold heating steam pressure, (iii) exhibit low distortion, low shrinkage, and a wide range of heating conditions for molding, even if the mold heating steam pressure is increased, (iv) indicate a satisfactory moldability even in a case where the expanded particles are molded with use of, for example, a mold having a complicated shape, a large mold, and (v) keep its properties such as compressive strength, without being impaired largely, in a case where the polypropylene resin expanded particles are used to prepare an in-mold foaming molded product.

Method and apparatus for discharging a polymer from a gas-phase reactor

Process for discharging polyolefin particles from a gas-phase polymerization reactor of a pressure from 1.0 MPa to 10 MPa to a discharge vessel of a pressure from 0.1 MPa to 1.0 MPa wherein the discharging is carried out discontinuously through at least two discharge lines in which the polyolefin particles are transported horizontally or upwards, process for polymerizing olefins at temperatures of from 30° C. to 160° C. and pressures of from 1.0 MPa to 10 MPa in the presence of a polymerization catalyst in a gas-phase polymerization reactor comprising discharging the obtained polyolefin particles from the gas-phase polymerization reactor by the process for discharging polyolefin particles and apparatus for polymerizing olefins in the gas-phase comprising a polymerization reactor, a discharge vessel and at least two pipes connecting the polymerization reactor and the discharge vessel for discharging polyolefin particles, wherein the discharge lines are constructed in a way that the polyolefin particles conveyed from the polymerization reactor to the discharge vessel are transported horizontally or upwards.

Blue luminescent compounds

There is provided a compound having Formula I In the formula: R 1-4 are the same or different and are H, D, alkyl, silyl, aryl, deuterated alkyl, deuterated silyl, deuterated aryl, or an electron-withdrawing group; R 5 is H, D, alkyl, aryl, deuterated alkyl, or deuterated aryl; and R 6 -R 9 are the same or different and are H, D, alkyl, silyl, aryl, deuterated alkyl, deuterated silyl, or deuterated aryl. At least one of R 1-4 is an electron-withdrawing group.

Chain transfer agent removal between polyolefin polymerization reactors

A system and method for polymerizing olefin in the presence of a chain transfer agent in a first reactor to form a first polyolefin, discharging from the first reactor a transfer slurry having the first polyolefin and the chain transfer agent, and processing the transfer slurry in a separator to remove chain transfer agent and to provide a fluff slurry having the first polyolefin and a lower content of chain transfer agent than in the transfer slurry. The system and method provide for feeding the fluff slurry to a second reactor, polymerizing olefin in the second reactor to form a second polyolefin, and discharging from the second reactor a slurry having the second polyolefin.

Cyclopenta[b]Fluorenyl Transition Metal Compound, Catalyst Composition Containing the Same, and Method of Preparing Ethylene Homopolymer or Copolymer of Ethylene and Alpha-Olefin Using the Same

The present invention relates to a new transition metal compound based on cyclopenta[b]fluorenyl group, a transition metal catalyst composition containing the same and having high catalytic activity for preparing an ethylene homopolymer or a copolymer of ethylene and one α-olefin, a method of preparing an ethylene homopolymer or a copolymer of ethylene and α-olefin using the same, and the prepared ethylene homopolymer or the copolymer of ethylene and α-olefin. This application is a divisional application of U.S. application Ser. No. 14/789,512, filed Jul. 1, 2015, which is a divisional application of U.S. application Ser. No. 13/881,098, filed Apr. 23, 2013, which is a United States national phase application under 35 U.S.C. § 371 of International Application No. PCT/KR2012/004511 filed Jun. 8, 2012, and claims priority under 35 U.S.C. § 119(a)-(d) to Korean Patent Application Nos. 10-2012-0059441 filed on Jun. 1, 2012, and 10-2011-0055719, filed on Jun. 9, 2011 in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference in their entirety.The present invention relates to a new transition metal compound based on cyclopenta[b]fluorenyl group, a transition metal catalyst composition containing the same and having high catalytic activity for preparing an ethylene homopolymer or a copolymer of ethylene and one α-olefin, a method of preparing an ethylene homopolymer or a copolymer of ethylene and α-olefin using the same, and the prepared ethylene homopolymer or the copolymer of ethylene and α-olefin. More particularly, the present invention relates to a transition metal compound that is advantageous in obtaining high-efficiency and high-molecular weight ethylene-based polymers by having a structure where a Group 4 transition metal in the Periodic Table of Elements as a core metal is linked with a cyclopenta[b]fluorenyl group that has a rigid plane structure even though it is not in a hetero ring; has abundant electrons widely ...

Systems and Methods for Real-Time Catalyst Particle Size Control in a Polymerization Reactor

Polymerization reactor systems providing real-time control of the average particle size of catalyst system components are disclosed. Methods for operating such polymerization reactor systems also are described.

Method for manufacturing acrylic acid-based polymer and use for same

The present invention relates to a production method for efficiently obtaining an acrylic acid-based polymer having a narrow molecular mass distribution and a low molecular mass, without using a large amount of chain transfer agent. A method for continuously producing an acrylic acid-based polymer obtained by continuously polymerizing a monomer having acrylic acid as an essential component, characterized in that a liquid feed pump applies a mechanical load of 0.5 to 2.5 kJ/L to the liquid discharged from the outlet of a reactor. An acrylic acid-based polymer having fewer high-molecular-mass components, excellent dispersion and other properties, and a low molecular mass is thereby obtained.

Co-precipitation reactor and method of manufacturing positive electrode active material precursor for secondary battery using the same

A co-precipitation reactor for manufacturing a positive electrode active material precursor for a secondary battery, the co-precipitation reactor including a reaction chamber having a plurality of suppliers configured to direct a reaction material and a pH adjusting material into the reaction chamber, a stirrer configured to be disposed in the reaction chamber, a drive motor configured to rotate the stirrer, a stirring shaft configured to receive power from the drive motor and rotate the stirrer, a first heater configured to heat an outside of the reaction chamber to heat the reaction material and the pH adjusting material, and a second heater configured to heat an inside of the reaction chamber to heat the reaction material and the pH adjusting material.

Catalysts

The present invention relates to novel metallocene catalysts of formula I, which is defined herein. The present invention also provides processes for making these catalysts and their use in olefin polymerisation reactions.

Method for producing methacrylic-based polymer

There is provided a method capable of producing a methacrylic-based polymer excellent in pyrolysis resistance and excellent in fabricability in a high productivity. The method for producing a methacrylic-based polymer includes the following steps (1) and (2): step (1) of using a complete mixing reactor (A) to thereby obtain the first syrup, including specific steps; step (2) of using a reaction apparatus (D) including a plug flow mixer (B) and a plug flow reactor (C) to thereby obtain the second syrup, including specific steps.

Neodymium-catalyzed polybutadienes

The invention relates to a high-molecular-weight, linear, neodymium-catalysed polybutadiene having a high proportion, >95%, of cis-1,4 units having a low proportion, <1%, of 1,2-vinyl content, and also having a small molar-mass-polydispersity index (MPI), characterized in that Mooney viscosity (ML 1+4 100° C.) of the polybutadiene is from 70 to 90 and The molar-mass-polydispersity index of the polybutadiene is smaller than 10.

Preparation method of superabsorbent polymer

Provided is a method of preparing a superabsorbent polymer. According to the method of preparing the superabsorbent polymer of the present invention, provided is a superabsorbent polymer having improved physical properties, in which the superabsorbent polymer has improved absorption rate and liquid permeability without reduction in centrifuge retention capacity or absorbency under load.

Process for transitioning between incompatible polymerization catalysts

This invention relates to a process for transitioning between polymerization catalyst systems which are incompatible with each other. Particularly, the invention relates to a process for transitioning from an olefin polymerization reaction utilizing a traditional Ziegler-Natta catalyst system to an olefin polymerization reaction utilizing a metallocene catalyst system.

Catalyst delivery method and catalyst feeder

The present invention relates to an improved catalyst delivery method for introducing a supported bulky ligand metallocene-type catalyst system to a reactor for polymerizing one or more olefin(s). In particular, the invention provides for a method of introducing a supported metallocene-type catalyst system into a polymerization reactor by and in the presence of a carrier solution of an antistatic agent and a liquid diluent. Also, the invention is directed toward a catalyst feeder for use in a polymerization process.

Gas olefin polymerization process

The present invention relates to a continuous gas phase process comprising polymerizing one or more hydrocarbon monomer(s) in a fluidized bed reactor in the presence of catalyst system or polymerization catalyst and a condensable fluid for a period of at least 12 hours where the bed temperature is less than the Critical Temperature and the dew point temperature of the gas composition in the reactor is within 25 °C of the bed temperature.

Process for transitioning between incompatible polymerization catalysts

This invention relates to a process for transitioning between polymerization catalyst systems which are incompatible with each other. Particularly, the invention relates to a process for transitioning from an olefin polymerization reaction utilizing a traditional Ziegler-Natta catalyst system to a metallocene-olefin polymerization reaction.

Process for transitioning between incompatible polymerization catalysts

This invention relates to a process for transitioning between polymerization catalyst systems which are incompatible with each other. Particularly, the invention relates to a process for transitioning from an olefin polymerization reaction utilizing a traditional Ziegler-Natta catalyst system to an olefin polymerization reaction utilizing a metallocene catalyst system.

Process for transitioning between incompatible polymerization catalysts

Processo para transição entre catalisadores de polimerização incompatíveis

Process for transitioning between incompatible polymerization catalysts

1. A process for transitioning from a polymerization reaction catalyzed by a first catalyst to one catalyzed by a second catalyst comprising a metallocene catalyst, wherein said first and second catalysts are incompatible, said process comprising the steps of: a) discontinuing the introduction of the first catalyst into a reactor; b) introducing into and dispersing throughout the reactor a deactivating agent in an amount greater than about 1 molar equivalent, based on the total gram atom metal of the first catalyst in the reactor; c) purging the reactor; and d) introducing the second catalyst into the reactor in the absence of any scavenger. 2. A process for converting a continuous olefin polymerization reaction catalyzed by a first catalyst that is Ziegler-Natta-type catalyst comprising a transition metal halide and an organometallic compound of Groups 1, 2 or 3, to a continuous olefin polymerization reaction catalyzed by a second catalyst that is a metallocene-type catalyst comprising a metallocene component and an activator, said process for converting comprising the steps of: a) discontinuing the introduction of the first catalyst into a reactor; b) introducing into and dispersing throughout the reactor a deactivating agent in an amount greater than about 1 molar equivalent based on the total gram atom metal of the first catalyst in the reactor; c) purging the reactor of any remaining deactivating agent; and d) introducing the second catalyst into the reactor in the absence of any scavenger. 3. The process of Claim 1 wherein the first catalyst comprises a traditional Ziegler-Natta catalyst. 4. The process of any preceding Claim wherein the amount of deactivating agent is greater than about 2 molar equivalent, based on the total gram atom metal of the first catalyst in the reactor. 5. The process of any preceding Claim wherein said polymerization reaction is a gas phase process. 6. The process of any preceding Claim wherein the scavenger is an organometallic ...

METHOD FOR TRANSITION BETWEEN INCOMPATIBLE CATALYSTS

Process for transitioning between incompatible polymerization catalysts

Method for transferring between incompatible polymerization catalysts

Process for transitioning between incompatible polymerization catalysts

본 발명은 서로 비혼화성인 중합촉매 시스템간의 전환방법에 관한 것이다. 특히, 본 발명은 통상적인 지글러-나타 촉매 시스템을 사용하는 올레핀 중합반응으로부터 메탈로센 촉매 시스템을 사용하는 올레핀 중합반응으로의 전환방법에 관한 것이다. The present invention relates to a method for conversion between polymerization catalyst systems which are incompatible with each other. In particular, the present invention relates to a method for converting an olefin polymerization reaction using a conventional Ziegler-Natta catalyst system to an olefin polymerization reaction using a metallocene catalyst system.

不相容的聚合催化剂之间的转换方法

本发明涉及一种彼此不相容的聚合催化剂体系之间的转换方法。特别是，本发明涉及一种使用传统的齐格勒—纳塔催化剂体系的烯烃聚合反应转换到使用金属茂催化剂体系的烯烃聚合反应的方法。

TRANSITION AND CONVERSION PROCESS BETWEEN CATALYZED POLYMERIZATION REACTIONS BY INCOMPATIBLE CATALYSTS BETWEEN

Esta invención se refiere a un proceso para hacer una transición entre reacciones de polimerización catalizadas por catalizadores incompatibles entresí. Particularmente, la invención se refiere a un proceso para hacer la transición deun a reacción de polimerización de olefina que utiliza un sistemacatalizador Ziegler-Natta tradicional a una reacción de polimerización de olefina que utiliza un sistema catalizador de metaloceno. This invention relates to a process for making a transition between polymerization reactions catalyzed by intersy incompatible catalysts. In particular, the invention relates to a process for transitioning from an olefin polymerization reaction using a traditional Ziegler-Natta catalyst system to an olefin polymerization reaction using a metallocene catalyst system.

Process for transitioning between incompatible polymerization catalysts

Process for transitioning between incompatible polymerization catalysts.

A method of catalyst transitions in olefin polymerizations

A method for transitioning between two different catalysts in olefin polymerizations, a first catalyst and a second catalyst, comprising the steps of: discontinuing the feed of the first catalyst into the polymerization reactor; and introducing the second catalyst into the reactor; wherein the transition is performed between a chromium-based catalyst and a metallocene catalyst.

PROCESS FOR STARTING A GASEOUS OLEFIN POLYMERIZATION

The subject-matter of the present invention is thus a process for starting up a gas phase olefin polymerisation reaction carried out using a Ziegler-Natta type catalyst based on a transition metal in a fluidized-bed reactor, through which passes a reaction gas mixture comprising the olefin, an inert gas, hydrogen and optionally at least one comonomer and which operates under conditions of temperature and pressure which make it possible to start up the polymerization, characterized in that the partial pressure of the olefin and the rate of introduction of catalyst into the reactor are increased whilst maintaining the ratios of the partial pressures of the olefin to the hydrogen and to the optional comonomer or comonomers substantially constant.

Start-up polymerization process

Method for transitioning from a catalyst to an incompatible catalyst in a gas-phase reactor

The present invention is a process for transitioning from a first polymerization catalyst system to a second polymerization catalyst system incompatible with the first polymerization catalyst system in a gas-phase reactor. The novel process comprises conducting a first polymerization reaction using a first polymerization catalyst system; stopping the first polymerization reaction; removing the contents of the first polymerization reaction from the reactor while maintaining a substantially closed system; then, in the substantially closed system, introducing a substantially contaminant free seedbed into the reactor; introducing a second feed system and a second catalyst system into the reactor; and conducting a second polymerization reaction.

Processes for transitioning between metallocene and ziegler-natta polymerization catalysts

Processes for transitioning among polymerization catalyst systems, preferably catalyst systems that are incompatible with each other. In particular, the processes relate to transitioning from olefin polymerizations utilizing metallocene catalyst systems to olefin polymerizations utilizing traditional Ziegler-Natta catalyst systems.

Mixed catalyst system

This invention relates to a process to polymerize olefins comprising reacting olefins with a combined catalyst system comprising a hydrogen generating olefin polymerization catalyst and from 10 ppm to 10 weight % of at least one hydrogen consuming olefin polymerization catalyst system, based upon the weight of the total catalyst present, not including any activators or supports.

Start up methods for multiple catalyst systems

This invention relates to a method to introduce multiple catalysts into a gas or slurry phase reactor comprising: (a) introducing one or more olefins and a first catalyst and an activator into the reactor and allowing the olefins to polymerize, (b) obtaining a polyolefin, (c) introducing a second catalyst and an optional activator into the first catalyst/activator composition and thereafter introducing the combination into the reactor and allowing the olefins to polymerize. This invention further relates to a method to introduce multiple catalysts into a gas or slurry phase reactor comprising: (a) introducing one or more olefins, a first catalyst and an activator, and a second catalyst and an optional activator into the reactor, wherein the all the catalysts and activators are combined together prior to being introduced into the reactor.

Transition strategy for the production of sticky polymers

The invention relates to a process for transitioning from polymerizing sticky polymer to polymerize another sticky polymer in gas phase fluidization bed production to decrease transition time, reduce off-grade material, and/or prevent operational difficulty.

Method for transitioning between Ziegler-Natta and metallocene catalysts in a bulk loop reactor for the production of polypropylene

The present invention relates to propylene polymerization process in a bulk loop reactor, and particularly to propylene polymerization process for polymerizing commercial quantities of polypropylene in a bulk loop reactor by sequentially introducing Ziegler-Natta and metallocene catalyst systems into the bulk loop reactor. In one embodiment, separate catalyst mixing systems are used to introduce a quantity of metallocene catalyst and Ziegler-Natta catalyst into the bulk loop reactor. The frequency rate at which the quantity of metallocene catalyst is introduced into the bulk loop reactor may be higher than the frequency rate at which the quantity of Ziegler-Natta catalyst is introduced. In another embodiment, a method of polymerizing propylene in a bulk loop reactor is provided which includes contacting a quantity of supported metallocene catalyst with a first quantity of scavenger, such as TEAL and or TIBAL, prior to injecting the supported metallocene catalyst into the bulk loop reactor and contacting a quantity of Ziegler-Natta catalyst system with a second quantity of scavenger prior to injecting the Ziegler-Natta catalyst system into the bulk loop reactor, wherein the second quantity of scavenger is greater that the first quantity of scavenger. In another embodiment, a method of contacting a flow of metallocene with a flow of propylene is provided. This method includes directing the flow of metallocene towards a junction, directing the flow of propylene towards the junction and maintaining a portion of the flow of metallocene separate from a portion of the flow propylene within a portion of the junction downstream of the flow of propylene into the junction. In another embodiment, a method of introducing a quantity of antifouling agent into a catalyst mixing system is provided. In this embodiment a portion of the antifouling agent is introduced at or downstream of a point of contact of a stream of propylene with a stream of catalyst. The antifouling agent may be ...

Processes for transitioning between Ziegler-Natta and alumoxane-based single-site polymerization catalysts

Processes for transitioning among polymerization catalyst systems, preferably catalyst systems that are incompatible with each other. In particular, the processes relate to transitioning among olefin polymerization reactions utilizing Ziegler-Natta catalyst systems, metallocene catalyst systems and other MAO-based single site catalyst systems.

Processes for transitioning between various polymerization catalysts

This invention relates to processes for transitioning among polymerization catalyst systems, preferably catalyst systems, which are incompatible with each other. Particularly, the invention relates to processes for transitioning among olefin polymerization reactions utilizing Ziegler-Natta catalyst systems, metallocene catalyst systems and chromium-based catalyst systems.

Process for transitioning between incompatible catalysts using a substantially contaminant free seedbed

The present invention is a process for transitioning from a first polymerization reaction to a second polymerization reaction incompatible with the first polymerization reaction in a gas-phase reactor. The novel process comprises conducting multiple polymerization reactions, capturing and storing a substantially contaminant-free polymerization product from each multiple polymerization reaction for use as a selected substantially contaminant-free seedbed in a second polymerization, wherein the polymerization product from each multiple polymerization reaction is rendered substantially contaminant-free by stripping or venting reactants and contaminants and is maintained as substantially contaminant-free by storage under an inert atmosphere.

Process for transitioning between Ziegler-Natta-based and chromium-based catalysts

Embodiments of our invention relate to processes for transitioning among polymerization catalyst systems including processes for transitioning among olefin polymerization reactions using Ziegler-Natta catalysts systems and chromium-based catalyst systems. Among embodiments contemplated are a method of transitioning from a first catalyst to a second catalyst in an olefin polymerization reactor, comprising: adding to the reactor a deactivating agent (DA) selected from one of carbon monoxide, carbon dioxide, or combinations thereof; adding to the reactor a cocatalyst adsorbing agent (CAA), comprising an inorganic oxide selected from one of silica, alumina or combinations thereof; wherein the first catalyst comprises at least one conventional Ziegler-Natta catalyst, and a cocatalyst, wherein the second catalyst comprises at least one chromium-based catalyst, wherein the reactor is a gas-phase, fluidized bed reactor, and wherein the CAA is substantially free of transition metals. In another embodiment a method of transitioning from a first catalyst to a second catalyst in an olefin polymerization reactor is contemplated, comprising: adding a transition aid agent (TAA) wherein the TAA is selected from one of alkoxylated amines, alkoxylated amides, or combinations thereof, wherein the first catalyst comprises at least one Ziegler-Natta catalyst comprising the catalyst, a cocatalyst and optionally a support, and the second catalyst comprises at least one chromium-based catalyst.

A process for transitioning between ziegler natta system and metallocene catalyst system

본 발명은 서로 비혼화성인 중합 촉매 시스템 간의 전환 방법에 관한 것으로서, 보다 상세하게는 통상적인 지글러 나타 촉매 시스템을 사용하는 올레핀 중합반응에서 메탈로센 촉매 시스템을 사용하는 올레핀 중합반응으로 전환시키는 방법에 관한 것이다. 본 발명에 따르면, 다양한 중합 반응에 대해 비활성화제를 최소의 양으로 사용하므로써, 비혼화성 촉매계 간의 전환공정의 시간을 단축하고, 신규로 도입되는 촉매의 중합반응 진행이 용이하게 일어나도록 해줄 뿐만 아니라, 시트 발생 등과 같은 문제를 예방하는 효과를 나타낸다. The present invention relates to a process for converting between immiscible polymerization catalyst systems, and more particularly to a process for converting an olefin polymerization reaction using a conventional Ziegler-Natta catalyst system to an olefin polymerization reaction using a metallocene catalyst system. It is about. According to the present invention, by using a deactivator in a minimum amount for various polymerization reactions, not only shortens the time of the conversion process between immiscible catalyst systems, but also facilitates the progress of polymerization of newly introduced catalysts, It is effective in preventing problems such as sheet generation. 비활성화제, 전환, 지글러 나타, 메탈로센, 올레핀, 비혼성화 촉매 Deactivator, Conversion, Ziegler-Natta, Metallocene, Olefin, Unhybridized Catalyst

The use of hydrogen scavenging catalysts to control polymer molecular weight and hydrogen levels in a polymerization reactor

The present invention provides dual catalyst systems containing a metallocene catalyst and a hydrogen scavenging catalyst, and polymerization processes employing these dual catalyst systems. Due to a reduction in hydrogen levels in the polymerization processes, olefin polymers produced from these polymerization processes may have a higher molecular weight, a lower melt index, and higher levels of unsaturation.

Process for transitioning between incompatible polymerization catalysts

This invention relates to a process for transitioning between incompatible polymerization catalyst systems. Particularly, the invention relates to a process for transitioning from an olefin polymerization reaction utilizing a traditional Ziegler-Natta catalyst system to a metallocene-olefin polymerization reaction.

Method of catalyst transitions in olefin polymerizations

A method for transitioning between two different catalysts in olefin polymerizations, a first catalyst and a second catalyst, comprising the steps of: discontinuing the feed of the first catalyst into the polymerization reactor, and introducing the second catalyst into the reactor, wherein the transition is performed between a chromium-based catalyst and a metallocene catalyst.

Start-up polymerization process

The subject-matter of the present invention is thus a process for starting up a gas phase olefin polymerisation reaction carried out using a Ziegler-Natta type catalyst based on a transition metal in a fluidized-bed reactor, through which passes a reaction gas mixture comprising the olefin, an inert gas, hydrogen and optionally at least one comonomer and which operates under conditions of temperature and pressure which make it possible to start up the polymerization, characterized in that the partial pressure of the olefin and the rate of introduction of catalyst into the reactor are increased whilst maintaining the ratios of the partial pressures of the olefin to the hydrogen and to the optional comonomer or comonomers substantially constant.

Start-up polymerization process

Start-up polymerization process

The subject-matter of the present invention is thus a process for starting up a gas phase olefin polymerisation reaction carried out using a Ziegler-Natta type catalyst based on a transition metal in a fluidized-bed reactor, through which passes a reaction gas mixture comprising the olefin, an inert gas, hydrogen and optionally at least one comonomer and which operates under conditions of temperature and pressure which make it possible to start up the polymerization, characterized in that the partial pressure of the olefin and the rate of introduction of catalyst into the reactor are increased whilst maintaining the ratios of the partial pressures of the olefin to the hydrogen and to the optional comonomer or comonomers substantially constant.

Method for transitioning from a catalyst to an incompatible catalyst in a gas-phase reactor

The present invention is a process for transitioning from a first polymerization catalyst system to a second polymerization catalyst system incompatible with the first polymerization catalyst system in a gas-phase reactor. The novel process comprises conducting a first polymerization reaction using a first polymerization catalyst system; stopping the first polymerization reaction; removing the contents of the first polymerization reaction from the reactor while maintaining a substantially closed system; then, in the substantially closed system, introducing a substantially contaminant free seedbed into the reactor; introducing a second feed system and a second catalyst system into the reactor; and conducting a second polymerization reaction.

在气相反应器中将催化剂转换成不相容催化剂的方法

本发明涉及在气相反应器中将第一聚合催化剂体系转换成第二聚合催化剂体系的方法，所述第二聚合催化剂体系与第一聚合催化剂体系是不相容的。该新方法包括下述步骤：进行利用第一聚合催化剂体系的第一聚合反应；停止第一聚合反应；在保持基本上是封闭的系统的同进，取出反应器中第一聚合反应的内容物；然后，在这个基本上是封闭的系统中，向反应器中引入基本上不含杂质的种子床；向反应器中引入第二进料体系和第二催化剂体系；并且进行第二聚合反应。

Processes for transitioning between metallocene and ziegler-natta polymerization catalysts

Processes for transitioning among polymerization catalyst systems, preferably catalyst systems that are incompatible with each other. In particular, the processes relate to transitioning from olefin polymerizations utilizing metallocene catalyst systems to olefin polymerizations utilizing traditional Ziegler-Natta catalyst systems.

Process for transitioning between incompatible polymerization catalysts

This invention relates to a process for transitioning between polymerization catalyst systems which are incompatible with each other. Particularly, the invention relates to a process for transitioning from an olefin polymerization reaction utilizing a traditional Ziegler-Natta catalyst system to an olefin polymerization reaction utilizing a metallocene catalyst system.

Способ взаимного перехода несовместимых катализаторов полимеризации

В заявке описан способ перехода между полимеризационными каталитическими системами, которые не совместимы друг с другом. В частности, в заявке описан способ перехода от реакции полимеризации олефина с использованием традиционной каталитической системы Циглера-Натта к реакции полимеризации олефина с использованием металлоценовой каталитической системы.Международная заявка была опубликована вместе с отчетом о международном поиске.

Process for transitioning between incompatible polymerization catalysts

This invention relates to a process for transitioning between polymerization catalyst systems which are incompatible with each other. Particularly, the invention relates to a process for transitioning from an olefin polymerization reaction utilizing a traditional Ziegler-Natta catalyst system to an olefin polymerization reaction utilizing a metallocene catalyst system.

不相容的聚合催化剂之间的转换方法

本发明涉及一种彼此不相容的聚合催化剂体系之间的转换方法。特别是,本发明涉及一种使用传统的齐格勒－纳塔催化剂体系的烯烃聚合反应转换到使用金属茂催化剂体系的烯烃聚合反应的方法。

비혼화성 중합 촉매간의 전이방법

본 발명은 서로 비혼화성인 중합촉매 시스템간의 전이방법에 관한 것이다. 특히, 본 발명은 전통적인 지글러-나타 촉매 시스템을 사용하는 올레핀 중합반응으로부터 메탈로센 촉매 시스템을 사용하는 올레핀 중합반응으로의 전환방법에 관한 것이다.

METHOD FOR TRANSITION BETWEEN INCOMPATIBLE CATALYSTS

非相溶性重合触媒間を移行する方法

(57)【要約】 本発明は、互いに非相溶性である重合触媒系間を移行する方法に関する。特に、本発明は、伝統的なチーグラ・ナッタ触媒系を用いるオレフィン重合反応から、メタロセン触媒系を用いるオレフィン重合反応へ移行する方法に関する。

Polymerization process

Processes for transitioning between chrome-based and mixed polymerization catalysts

A process of transitioning from a first polymerization reaction conducted in the presence of a mixed catalyst system to a second polymerization reaction conducted in the presence of a chrome-based catalyst system is disclosed, the polymerization reactions being conducted in one embodiment in a polymerization zone of a gas phase fluidized bed reactor which contains a fluidized bed of polymer particles by the essentially continuous passage of monomer gases through the polymerization zone, comprising: a) discontinuing the introduction of the mixed catalyst system into the reactor; b) maintaining polymerization conditions in the reactor and permitting polymerization to continue for a period of time to allow the components of the mixed catalyst system present in the reactor to produce additional polymer particles; c) introducing a deactivating agent into the fluidized bed in an amount sufficient to deactivate the mixed catalyst system; d) establishing optimal conditions within the reactor for the chrome-based catalyst system; and e) introducing the chrome-based catalyst system into the reactor characterized in that the amount of polymer particles in the fluidized bed is substantially maintained in the polymerization zone during the transition steps.

Process for polymerizing a monomer charge

Process of polymerizing a monomer charge including ethylene by (1) drying an inorganic oxide having surface hydroxyl groups to form a support that is substantially free of adsorbed water, (2) reacting the surface hydroxyl groups of the support with at least a substantially stoichiometric amount of at least one organometallic compound corresponding to the formula R x MR' y R" z , wherein M is a metal of Group III of the periodic table, R is an alkyl group containing 1 to 12 carbon atoms, R' and R" are independently selected from the group consisting of H, Cl, and alkyl and alkoxy groups containing 1 to 12 carbon atoms, x has a value of 1 to 3, and y and z both represent values of 0 to 2, the sum of which is not greater than 3-x, (3) reacting the thus-treated support with at least about 0.001 mol, per mol of organometallic compound, of at least one vanadium compound corresponding to a formula selected from (RO) n VOX 3-n and (RO) m VX 4-m , in which formulas R represents a C 1 -C 18 monovalent hydrocarbon radical that is free of aliphatic unsaturation, X is Cl or Br, n has a value of 0 to 3, and m has a value of 0 to 4, (4) reacting the product of step 3 with at least about 0.1 mol, per mol of organometallic compound, of an alcohol containing 1 to 18 carbon atoms, (5) feeding the product into a gas-phase reaction zone, (6) feeding a trialkylaluminum into the gas-phase reaction zone in order to form a bed comprising the product and the trialkylaluminum, (7) fluidizing the bed with a gas mixture including ethylene, hydrogen and chloroform, (8) removing particulate polymerized substantially ethylene particles from the reaction zone, and (9) recycling unreacted gas mixture from the top of the reaction zone to the bottom of the reaction zone.

Use of alkylaluminum compounds and hydroxyl-containing compounds to initiate polymerization of ethylene with chromium oxide catalysts

A method for smoothly and reliably initiating polymerization of ethylene with a supported chromium oxide catalyst, with smaller amounts of catalyst and in substantially shorter periods of time then heretofore required, by adding an alkylaluminum compound and ahydroxyl-containing compound to the reactor of a polymerization reaction system prior to the commencement of polymerization and subjecting said alkylaluminum compound and hydroxyl-containing compound to suitable conditions of temperature and pressure for a time sufficient for said alkylaluminum compound to react completely with the moisture present in said reactor and said hydroxyl-containing compound.

Highly active catalyst composition for polymerizing alpha-olefins

There is disclosed a highly active catalyst composition for polymerizing alpha-olefins prepared by treating a support with an organomagnesium composition and contracting the thus formed solid support, containing magnesium, in a liquid medium with a transition metal compound, e.g., a tetravalent titanium compound. This catalyst is particularly useful for the production of linear low density polyethylene polymers. Also disclosed are methods of preparing polymers with the catalyst composition and the resulting polymers.

Catalyst delivery method, a catalyst feeder and their use in a polymerization process

The present invention relates to an improved catalyst delivery method for introducing a supported bulky ligand metallocene-type catalyst system to a reactor for polymerizing one or more olefin(s). In particular, the invention provides for a method of introducing a supported metallocene-type catalyst system into a polymerization reactor by and in the presence of a carrier solution of an antistatic agent and a liquid diluent. Also, the invention is directed toward a catalyst feeder for use in a polymerization process.

método para transferir um sistema de catalisador, processo para a polimerização de olefinas e monÈmeros em um reator, bem como composição de catalisador de polimerização e alimentador de catalisador.

Catalyst delivery method and catalyst feeder

Catalyst delivery method and catalyst feeder

CATALYST ADDING METHOD AND CATALYST ADDING DEVICE

Catalyst delivery method and catalyst feeder

The present invention relates to an improved catalyst delivery method for introducing a supported bulky ligand metallocene-type catalyst system to a reactor for polymerizing one or more olefin(s). In particular, the invention provides for a method of introducing a supported metallocene-type catalyst system into a polymerization reactor by and in the presence of a carrier solution of an antistatic agent and a liquid diluent. Also, the invention is directed toward a catalyst feed er for use in a polymerization process.

METHOD OF CATALYST SUPPLY AND CATALYST FEEDER.

Un método para suministrar un sistema catalítico tipo metaloceno de ligando voluminoso soportado a un reactor de polimerización en fase gas o en suspensión que utiliza una disolución vehículo que comprende un agente antiestático y un diluyente líquido, en el que la disolución vehículo sirve para hacer fluir el sistema catalítico tipo metaloceno de ligando voluminoso soportado dentro del reactor, y en el que la disolución vehículo contiene en el intervalo de 0, 01 a por ciento en peso del agente antiestático basado en el peso total de la disolución vehículo. A method for supplying a metallocene voluminous ligand-type catalyst system supported to a gas or suspension phase polymerization reactor using a vehicle solution comprising an antistatic agent and a liquid diluent, in which the vehicle solution serves to flow the metallocene type system of bulky ligand supported within the reactor, and in which the vehicle solution contains in the range of 0.01 to percent by weight of the antistatic agent based on the total weight of the vehicle solution.

Polymerization process

The present invention relates to a catalyst composition of an activator, a catalyst compound and a support in a liquid. The catalyst composition of the invention is utilized as prepared, in the liquid, in a process for polymerizing olefin(s), preferably a slurry polymerization process.

Process for the gas-phase (co-) polymerisation of olefins in a fluidised bed reactor

The present invention relates to a process for the gas-phase (co-)polymerisation of olefins in a fluidised bed reactor wherein fouling is prevented and/or flowability of polymer is improved thanks to the use of a process aid additive.

Olefin polymerization process

A process for olefin polymerization in a reaction vessel, said process comprising polymerizing at least one α-olefin in a polymerization stage employing a catalyst feed comprising 1) a first catalyst composition having at least two active catalytic sites capable of producing a first set of polymer components; 2) a second catalyst composition having at least two active catalytic sites capable of giving essentially the same set of polymer components as produced by the catalyst in feed (1) under the same polymerization conditions but these components in a different ratio to those produced by the catalyst composition of feed (1); wherein the amounts of catalyst compositions (1 and 2) fed into the reaction vessel are independently controlled.

Method for operating a gas phase polymerization reactor

Disclosed herein is a method of operating a polymerization reactor for a polymerization reaction comprising modifying a recycle gas composition to increase the heat capacity of the recycle gas wherein the recycle gas composition is modified by reducing or eliminating the nitrogen concentration in the recycle gas. In an embodiment, the nitrogen concentration is reduced or eliminated by reducing or eliminating one or more nitrogen input sources to the polymerization reactor and replacing the nitrogen with an alternate inert fluid (a gas or liquid that is inert to the catalyst and reactants). The alternate inert fluid has a higher heat capacity and a higher molecular weight than nitrogen. In an embodiment, the nitrogen utilized to convey a catalyst into the polymerization reactor is replaced with an alternate inert fluid. In an embodiment, the alternate inert fluid is ethane, propane, isobutane, or combinations thereof.

Activating supports

Activating supports may be suitably prepared by the following procedure (a) providing a porous mineral oxide support material, (b) treating the support with a phosphorus-containing compound, (c) treating the support from step (b) with an organometallic compound, (d) heating the functionalized support from step (c) under an inert gas and then under an atmosphere comprising oxygen, (e) fluorinating the support with a fluorinating agent, and (f) recovering an activating support. The activating supports are suitable used in combination with single site catalysts for the polymerization of olefins. The supports are most preferably used in combination with metallocene complexes. The preparative route for the activating supports provides for supported polymerization catalyst systems having excellent activities.

Polymerization process using a metallocene catalyst system

Provided is a process for polymerizing olefins in the presence of a metallocene catalyst compound having at least one fluoride or fluorine containing leaving group. More particularly, the present invention is directed to a process and catalyst composition having improved reactor performance, reducing or eliminating the need for anti-fouling additives to the catalyst composition and/or the reactor. In one embodiment, the invention is a process of polymerizing olefins comprising contacting ethylene and at least one comonomer with a supported catalyst system comprising a metallocene catalyst compound, the metallocene catalyst compound comprising at least one fluoride ion or fluorine containing leaving group; and wherein the supported catalyst system comprises an inorganic oxide support having an average particle size of from 35 μm or less and a pore volume of from 1 to 2 cm 3 /g. The polymer product resulting therefrom is, in one embodiment, a copolymer having a density in the range of from 0.910 g/cm 3 to 0.940 g/cm 3 ; a molecular weight distribution of from 1.8 to 4; and an I 2 of from 0.1 dg/min to 10 dg/min and is suitable for such articles as films.

Substituted group 4 metal complexes, catalysts and olefin polymerization process

본 발명은 하나 이상의 아릴기로 치환된 질소-함유 지방족 또는 지환족 잔기를 특징으로 하는, 구속 기하형의 4족 금속 착체, 이로부터 유도된 촉매 및 이 촉매를 사용한 중합 방법에 관한 것이다. The present invention relates to a constrained geometry Group 4 metal complex, a catalyst derived therefrom, and a polymerization process using the catalyst, characterized by nitrogen-containing aliphatic or alicyclic moieties substituted with one or more aryl groups.

Verfahren zur verabreichung von katalysatoren für popylenpolymerisation

Processes for transitioning between metallocene and Ziegler-Natta polymerization catalysts

Processes for transitioning among polymerization catalyst systems, preferably catalyst systems that are incompatible with each other. In particular, the processes relate to transitioning from olefin polymerizations utilizing metallocene catalyst systems to olefin polymerizations utilizing traditional Ziegler-Natta catalyst systems.

Dual metallocene catalyst for producing film resins with good machine direction (MD) elmendorf tear strength

This invention relates to catalyst compositions comprising a first metallocene compound, a second metallocene compound, at least one chemically-treated solid oxide, and at least one organoaluminum compound. This invention also relates to methods to prepare and use the catalyst compositions and new polyolefins. The compositions and methods disclosed herein provide ethylene polymers and copolymers with lower MI, increased melt strength, and good MD tear properties.

Random copolymers and formulations useful for thermoforming and blow molding applications