Fast-crystallizing polyester compositions

The present invention relates to fast-crystallizing polyester compositions comprising: (a) a thermoplastic polyester resin; (b) a nucleating agent of the formula: см. иллюстрацию в PDF-документе wherein: R is an alkali or alkaline-earth metal; m is 1, 2 or 3; n takes an average value within the range of 1 to 5; said nucleating agent being optionally admixed with the compound of formula (I) wherein R is a hydrogen atom, linear alkyl radial or branched alkyl radical each having from 1 to 6 carbon atoms; with the proviso that at least 50% mole of said nucleating agent is in the salt form. This nucleating additive raises the crystallization temperature upon cooling (Tcc) of the polyester so that crystallization occurs rapidly during molding.

Photochromatic and thermochromatic compounds and their application in polymeric materials

A description follows of photochromatic and thermochromatic compounds, belonging to the group of spiro-indoline-oxazines, and their application in polymeric materials.

Process for obtaining granular forms of additives for organic polymers

process for obtaining granular forms, from mixtures of powders of two or more additives for organic polymers, including extruding the mixture at a temperature of between about the melting point of the component with the lowest melting point and 140°C, with the condition that, when the mixture consists of two additives, these are not tetrakis [3-(3,5-di-t-butyl-4-hydroxyphenyl) propionyloxymethyl] methane, either in an amorphous or crystalline form, and an antiacid.

Process for the preparation of alkyl isocyanates

Multistep process for the preparation of alkyl mono and diisocyanates consisting in reacting the corresponding aliphatic amine or diamine with dimethylcarbonate and, substantially, in partially vaporizing and converting the urethane thus formed in an evaporator to subsequently terminate the cracking in a II° reactor, and finally subjecting the cracking product to fractional distillation at reduced pressure, recycling the unconverted part to the partial vaporization step.

Polyoxazolidines with a structure containing carbonate groups, procedure for their preparation and use

"POLYOXAZOLIDINES WITH A STRUCTURE CONTAINING CARBONATE GROUPS, PROCEDURE FOR THEIR PREPARATION AND USE" Abstract New polyoxazolidines can be defined with the general formula: (I)

Catalytic procedure for the preparation of organic carbonates

CATALYTIC PROCEDURE FOR THE PREPARATION OF ORGANIC CARBONATES. Abstract Catalytic procedure in gas phase for the preparation of a symmetrical or asymmetrical organic carbonate having the general formula (I): (I) wherein R and R', the same or different, represent a C1-C; alkyl radical, linear or branched, which includes reacting at least one alcohol having the general formula (II): R -OH or R' OH with carbon monoxide and oxygen in the presence of a catalyst composed of oxides, salts or complexes of cobalt.

Articoli ad elevato indice di rifrazione, composizioni liquide polimerizzabili e metodo per ottenerle