Hoechst Aktiengesellschaft

Aventis Research & Technologies Gmbh & Co Kg

Aventis Research & Technology Gmbh & Co. Kg

Peter Simon

Karsten Blatter

Andreas Greiner

Andree Henze

Spherical colored polyester particles, process for their preparation, and their use for powder coatings

Ball-shaped polyester particles capable of crosslinking at low

Colored powdery coating mass

A process is described for the preparation of polyesters by polycondensation of dicarboxylic acid-diol precondensates (oligomers) at elevated temperature in a liquid heat transfer medium in the presence of customary polycondensation catalysts and, if appropriate, cocondensable modifying agents, wherein the liquid heat transfer medium is inert and free of aromatic structural groups and has a boiling point in the range from 200.degree. to 320.degree. C., wherein the weight ratio of dicarboxylic acid-diol precondensate (oligomers) employed to liquid heat transfer medium is in the range from 20:80 to 80:20 and wherein the polycondensation is carried out in the reaction mixture at 200.degree. to 320.degree. C. in the presence of a dispersion stabilizer. Furthermore, the polyesters and copolyester which can be prepared by the process and their use are described.

Process for the preparation of polyesters and copolyesters, the products

The invention relates to a process for preparing compounds of the formula (I) ##STR1## by pyrolysis, where n is the degree of polymerization and is.gtoreq.2. For this purposes compounds of the formula (II)

Process for preparing polymers of p-xylylene from p-xylylene diesters

Growing community of inventors

Eppstein, Germany

Peter Simon