Process for the production of high molecular weight polyester

Details Process for the production of high molecular weight polyester Process for the production of high molecular weight polyester

1982-02-02

1983-02-22

Phynes, Lucille M.

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

Synthetic resins

From carboxylic acid or derivative thereof

528309, 528483, 528502, 528503, 5283082, C08G 6370

Patent

active

043749755

ABSTRACT:
A process for the continuous production of high molecular weight polyethylene terephthalate wherein the crystallized prepolymer having an intrinsic viscosity of at least 0.3 is dried, preheated and polymerized in a single moving bed reaction zone. The method is characterized by an inert gas atmosphere and a reaction zone with a temperature gradiant ranging from about 170.degree. C. at the uppermost portion and a higher temperature of about 225.degree. C. at the lowermost portion.

REFERENCES:
patent: 3031433 (1962-04-01), Monroe
patent: 3405098 (1968-10-01), Heighton et al.
patent: 3718621 (1973-02-01), Wilson
patent: 3728309 (1973-04-01), Maxion
patent: 3746688 (1973-07-01), Berkau
patent: 4064112 (1977-12-01), Rothe et al.
patent: 4161578 (1979-07-01), Herron
patent: 4230819 (1980-10-01), Hauenstein et al.
patent: 4231991 (1980-11-01), Muller

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