Process for recovering thermoplastic resins using esters

Details Process for recovering thermoplastic resins using esters Process for recovering thermoplastic resins using esters

1992-05-12

1993-08-03

Michl, Paul R.

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

Synthetic resins

Process of treating scrap or waste product containing solid...

521 425, 521 46, 521 465, 521 47, C08J 1104

Patent

active

052329542

ABSTRACT:
This invention relates to a process for recovering an ester-soluble thermoplastic resin comprising the steps of (1) crushing a shaped thermoplastic resin, (2) contacting the crushed thermoplastic resin with an ester to form a mixture, and (3) recovering the thermoplastic resin from the mixture by removing the ester or precipitating the thermoplastic resin. This invention also relates to a process for removing ester-insoluble impurities from the thermoplastic resin. The process uses non-halogenated and hydrocarbon free solvents to recover thermoplastic resins. This invention provides a means to recover shaped thermoplastic resin without adversely affecting the thermoplastic resin, such as its molecular weight.

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Derwent Publication 89-077923/11 (DE 3741-777-C).

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