Solid state polymerization

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof

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Details

528274, 528483, 528490, 528493, 528494, 528497, C08G 6302

Patent

active

046440496

ABSTRACT:
High molecular weight polyester resins are sometimes produced from low molecular weight polyester prepolymers having the same composition by solid state polymerization. Polyester prepolymers are generally converted from the amorphous state to the crystalline state prior to solid state polymerization in order to raise their sticking temperature. This is done in order to keep the polyester prepolymer from sticking together as a solid mass in the solid state polymerization reactor. Such polyester prepolymers have traditionally been crystallized by heating them to elevated temperatures. It has been found that polyester prepolymers can be crystallized by exposing them to the vapors of certain volatile organic compounds. By utilizing such vapors to crystallize polyester prepolymers the need for a thermal crystallization step can be eliminated.
The present invention specifically relates to an improved process for solid state polymerizing a polyester prepolymer into a high molecular weight polyester resin comprising

REFERENCES:
patent: 3960817 (1976-06-01), Morawetz et al.
patent: 4064112 (1977-12-01), Rothe et al.
patent: 4379912 (1983-04-01), Lu
patent: 4434276 (1984-02-01), Horlbeck et al.
patent: 4532319 (1985-07-01), Wendling

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