Process for the preparation of polyesters and copolyesters, the

Details Process for the preparation of polyesters and copolyesters, the Process for the preparation of polyesters and copolyesters, the

1996-06-27

1998-04-07

Mosley, Terressa M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528272, 2641761, 502150, 502164, C08G 6300

Patent

active

057366217

ABSTRACT:
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.

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patent: 4687811 (1987-08-01), Sasaki et al.
patent: 5296586 (1994-03-01), Burch et al.

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