Process for the preparation of high molecular weight polyesters

Details Process for the preparation of high molecular weight polyesters Process for the preparation of high molecular weight polyesters

1994-03-08

1995-03-14

Acquah, Samuel A.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

528272, 528274, 528302, 528308, 5283081, 5283086, 528489, 522 60, 522 71, 26433111, B29B 700, B29C 4500, C08F 600

Patent

active

053975294

ABSTRACT:
A process for producing high molecular weight polyester is provided which allows the production of small quantities of very high molecular weight polyester in a commercially convenient manner, comprising:
polycondensing an aromatic dicarboxylic acid with a mixture of an alkanediol and an alkenediol in the presence of a catalyst and in the substatial absence of oxygen, up to a viscosity number in the range from 50 to 140 cm.sup.3 /g to obtain a polyester,
contacting said polyester with 0.001 to 8% by weight of an agent which forms free radicals and dissociates with a half-life of 5 seconds to 120 minutes at temperatures in the range from 130.degree. to 350.degree. C., and
reacting said polyester and said agent which forms free radicals to provide the high molecular weight polyester.

REFERENCES:
patent: 3714291 (1973-01-01), Rockey
patent: 4425287 (1984-01-01), Hesse et al.
patent: 4822665 (1989-04-01), Scholz et al.
patent: 5047455 (1991-09-01), Hesse et al.
patent: 5314729 (1994-05-01), Ikezoe et al.
Patent Abstracts of Japan, vol. 4, No. 54 (C-8)(536), Apr. 23, 1980, JP-A-55 25462, Feb. 23, 1980.

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