Process for the production of polyester

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

1985-11-19

1986-09-16

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

046123636

ABSTRACT:
A process for the production of polyester comprising at least 80% of an ethylene terephthalate repeating unit using as a starting material an ester compound made mainly of terephthalic acid and ethylene glycol or an oligomer thereof is disclosed. This process is characterized in that a prepolymer having an intrinsic viscosity 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 is fed to a final polymerization unit and polymerized in the form of a molten thin film having a thickness of from 0.005 to 0.15 mm.

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

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