Process for polymerization of polyester oligomers

Details Process for polymerization of polyester oligomers Process for polymerization of polyester oligomers

1995-12-21

1998-09-22

Acquah, Sammuel A.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528272, 528279, 528283, 528285, 528298, 5283086, 528491, 528492, 528503, 525437, 525444, C08F 2000

Patent

active

058114963

ABSTRACT:
This invention is directed to an improved process for producing a polyester oligomer. The process employs a pipeline reactor, having at least two stages, in which the degree of polymerization of an oligomeric feed material is raised from about 2-10 to about 2-40 and the ratio of carboxyl to hydroxyl end groups in the product is reduced. In a first stage of the process, a monomeric diol or polyol, such as ethylene glycol, is added to a melt of the oligomeric feed material. In a second stage of the process, the molecular weight of the oligomer is increased by removal of volatile reaction by-products, including water and polyol. The oligomer produced by the present invention may be used in making higher molecular weight polyesters.

REFERENCES:
patent: 3480587 (1969-11-01), Porter
patent: 3496146 (1970-02-01), Mellichamp, Jr.
patent: 3590072 (1971-06-01), Leybourne, III
patent: 4212963 (1980-07-01), Lehr et al.

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