Solid state polymerization of polyester prepolymers

Details Solid state polymerization of polyester prepolymers Solid state polymerization of polyester prepolymers

1988-03-11

1989-10-24

Kight, John

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

Synthetic resins

From carboxylic acid or derivative thereof

5283081, 5283082, 5283085, 528483, 528502, 528503, C08G 6302

Patent

active

048763268

ABSTRACT:
High molecular weight polyester resins such as polyethylene terephthalate, are sometimes produced from low molecular weight polyester prepolymers having the same composition by solid state polymerization. The low molecular weight polyester prepolymers which are used in such solid state polymerizations are normally prepared by conventional melt polymerizations and are generally in the form of pellets or chips. It has been unexpectedly found that solid state polymerization rates can be greatly improved by utilizing polyester prepolymers which are in the form of porous pills. By utilizing polyester prepolymers that are in the form of porous pills, higher molecular weights can be achieved after shorter solid state polymerization times.

REFERENCES:
patent: 3586647 (1971-06-01), Kremer
patent: 4327205 (1982-04-01), Kato et al.
patent: 4374975 (1983-02-01), Duh

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