Production of branched polyesters

Details Production of branched polyesters Production of branched polyesters

1993-01-04

1995-02-28

Acquah, Samuel A.

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

Synthetic resins

From carboxylic acid or derivative thereof

528272, 5283082, 5283084, 5283085, 5283086, 528483, 528495, 528498, 528503, C08G 6316

Patent

active

053938631

ABSTRACT:
Disclosed is an improvement in a process for producing branched polyesters wherein a precursor polyester is first formed and subsequently the precursor polyester is formed into particles and further polymerized in the solid state, wherein the improvement comprises contacting the particles while at a temperature of about 140.degree. to about 2.degree. C. below the melting point of the polyester with the vapor of water or an organic compound having at least one OH group.

REFERENCES:
patent: 3953404 (1976-04-01), Borman
patent: 4064112 (1977-12-01), Rothe et al.
patent: 4591629 (1986-05-01), El-Ghatta et al.
patent: 5049647 (1991-06-01), Al-Ghatta
patent: 5145742 (1992-09-01), Yau
patent: 5149485 (1992-09-01), Belcher
Swiss Patent Application No. 655938, May 30, 1986 (abstract).
European Patent Application No. 0 389 948, Mar. 10, 1990.

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