Process for the production of polyester

Details Process for the production of polyester Process for the production of polyester

1985-11-19

1987-03-03

Phynes, Lucille M.

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

Synthetic resins

From carboxylic acid or derivative thereof

5283081, 5283083, 528483, 528501, C08G 6304, C08G 6322

Patent

active

046476504

ABSTRACT:
A process for the production of polyester is disclosed, comprising feeding an ester compound made mainly of terephthalic acid and ethylene glycol or an oligomer thereof to a final polymerization reactor, and then polymerizing it in the form of fine molten particles in an inert gas stream, wherein the ester compound has an intrinsic viscosity [.eta.] of not more than 0.4 dl/g and a carboxyl terminal group concentration [COOH] of not more than 90.times[eta]sup.-0.4 .mu.eq/g, and the fine particles have an average particle diameter of from 0.015 to 0.5 mm.

REFERENCES:
patent: 4161578 (1979-07-01), Herron
patent: 4205157 (1980-05-01), Duh
patent: 4289871 (1981-09-01), Rowan et al.
patent: 4360661 (1982-11-01), Horlbeck et al.
patent: 4374975 (1983-02-01), Duh
patent: 4387213 (1983-06-01), Horlbeck et al.
patent: 4532319 (1985-07-01), Wendling

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