Production of granular poly(arylene sulfide) polymers containing

Details Production of granular poly(arylene sulfide) polymers containing Production of granular poly(arylene sulfide) polymers containing

1992-10-23

1994-12-20

Nutter, Nathan M.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528388, 528481, 528487, 528488, 528489, 528492, 528494, C08G 7516

Patent

active

053747097

ABSTRACT:
A method for removing oligomers and non-polymeric impurities from poly(arylene sulfide) polymers and producing the polymers in easily recoverable granular form is provided in which a poly(arylene sulfide) polymer associated with oligomers and non-polymeric impurities is contacted with a solvent, water, and optionally, a base, at a sufficient temperature to substantially dissolve the polymer, oligomers and impurities; then the solution is cooled to a temperature at which the poly(arylene sulfide) precipitates while oligomers and impurities remain in solution, then the precipitated polymer is separated from the solution containing the oligomers and impurities. A polymer product produced by this method is also disclosed.

REFERENCES:
patent: 4071509 (1978-01-01), Edmonds, Jr.
patent: 4748231 (1988-05-01), Nesheiwat
patent: 4769442 (1988-09-01), Iwasaki et al.
patent: 5098992 (1992-03-01), Nesheiwat
patent: 5128445 (1992-07-01), Scoggins et al.

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