PLASMA SURFACE ACTIVATION METHOD AND RESULTING OBJECT

The invention relates to a method for depositing functional groups on a surface of an object, and to the object treated as such, by generating and maintaining a plasma, bringing the object surface close to or in a space between the plasma electrodes, an atmosphere being present between the two electrodes, and depositing a plurality of functional groups on at least part of the surface of the object, whereby the atmosphere between the two electrodes comprises a multi-functional hyperbranched compound which is a polymer based on ABtype monomers, or a derivative of such polymer, whereby m is at least 2, and A and B are two reactive functional groups selected such that group A is able to react at least m times with group B, and whereby the hyperbranched compound is having a degree of branching (DB) in the range of 10.0-99.9%. 1. A method for depositing functional groups on a surface of an object by generating and maintaining a plasma , said method comprising the steps of:a. bringing the object surface close to or in a space between a first and a second electrode, an atmosphere being present between the two electrodes,b. applying an alternating voltage to the first and the second electrode for generating and maintaining a plasma in the volumetric space between the two electrodes, the voltage alternating between a positive voltage for the first electrode and a zero voltage for the second electrode, and a zero voltage for the first electrode and a negative voltage for the second electrode, andc. depositing a plurality of functional groups on at least part of the surface of the object,{'sub': 'm', 'whereby the atmosphere between the two electrodes comprises a multi-functional hyperbranched compound which is selected from a polymer based on ABtype monomers, a derivative of such polymer, and mixtures thereof, whereby m is at least 2, and A and B are two reactive functional groups selected such that group A is able to react at least m times with group B, and whereby the ...

PROCESS FOR DEPOSITION AND CHARACTERIZATION OF A COATING

Provided herein are processes for depositing a plasma coating on a substrate and coated substrates obtained thereby. More particularly, processes for characterizing a plasma coating on a substrate are provided. The process for depositing a plasma coating includes the step of exposing the substrate to a plasma. The plasma includes at least one coating precursor and one fluorophore other than the coating precursor. 1. A process for characterizing a plasma coating on a substrate , whereby a fluorophore is incorporated in said plasma coating and wherein said plasma coating is characterized in-line by monitoring the fluorescence of said fluorophore.2. The process according to claim 1 , comprising the steps of:a) exposing said substrate to a non-thermal plasma or an afterglow region of said plasma, said plasma or afterglow comprising at least one coating precursor and one fluorophore other than said coating precursor, thereby obtaining a coated substrate wherein the coating of said coated substrate comprises said fluorophore;b) irradiating said coated substrate in-line with electromagnetic radiation suitable for exciting said fluorophore; andc) monitoring the light emitted from said fluorophore present in said coating in-line with the coating process so as to characterize said coating.3. The process according to claim 1 , wherein said process is a continuous process.4. The process according to claim 1 , wherein said coating precursor and fluorophore are comprised in a solution claim 1 , said solution being introduced into said plasma or said afterglow in the form of an aerosol together with a carrier gas.5. The process according to claim 3 , wherein said solution comprises said fluorophore in a concentration ranging between 10% and 100% of the concentration at saturation.6. The process according to claim 1 , wherein step c) comprises characterizing at least one property of said coating selected from the coating thickness and coating homogeneity.7. The process according to ...

Alpha-fluoroacrylic polymers for use in the manufacture of optical fibers with a polydispersity index 1.50 or below and a method of preparing them using molecular iodine as a chain transfer agent

Alpha-fluoroacrylic polymers with a polydispersity 1.50 or less and a method of producing them by radical polymerization. The polymers comprise more than 50% of units of the Formula -CXY-C(C=O-O-Z)F-, X, Y, Z = H, halogen, 1-20C hydrocarbon optionally substituted with one or more halogens and/or one or more of CN or OH or COOH or COOLi or COONa or COOK or COOR or NH2 or NHR or CO(NH2) or CO(NHR) or CO(NR2); R = 1-10C alkyl optionally substituted by one or more halogens; Z may also be an atom of an alkali metal . The method employs one or more ethylenically unsaturated monomers of which at least 50 wt.% are of the preceding formula and one or more halogenated compounds of Formula U1- U2, U1 = Br, I, Cl; U2 = H, sulfonyl SO2R', 1-40C hydrocarbon optionally substituted with one or more halogen and/or one or more of CN or OH or COOH or COOR' or NH2 or NHR' or NR'2 or CO(NH2) or CO(NHR') or CO(NR'2) or COR' or SiR3; R' = 1-10C alkyl . At least a proportion of each is introduced into a reactor in a first stage and the remainder in a second stage as the reaction progresses. An Independent claim is included for a method of making articles in a polymer material which employs one or more of the claimed polymers.

Release Liner

A method for producing a coating by atmospheric pressure plasma technology

The present invention is related to a method of coating a substrate, said method comprising the steps of: providing a substrate (1), producing an atmospheric pressure plasma discharge in the presence of a gas, at least partially exposing the substrate to said atmospheric pressure plasma discharge, introducing a liquid aerosol (6) of coating forming material into said atmospheric pressure plasma discharge, thereby forming a coating on the substrate, curing the substrate and coating, by exposing the substrate to ultraviolet light.

A method for stable hydrophilicity enhancement of a substrate by atmospheric pressure plasma deposition

The present invention is related to a method for applying a hydrophilic coating on a substrate, said method comprising the steps of : - providing a substrate (1), - producing an atmospheric pressure plasma discharge in the presence of a gas, - at least partially exposing the substrate to said atmospheric pressure plasma discharge, - introducing a liquid aerosol (6) or a vapour of coating forming material into said atmospheric pressure plasma discharge, thereby forming a coating on the substrate, characterized in that said coating forming material comprises a non-polymerizable acetate derivative. According to the preferred embodiment, said acetate derivative is ethyl acetate.

Trennschicht

Verfahren zur stabilen hydrophilie-verstärkung eines substrats mittels plasmaablagerung bei atmosphärischem druck