Reprecipitation of poly(arylene sulfide) to increase molecular w

Details Reprecipitation of poly(arylene sulfide) to increase molecular w Reprecipitation of poly(arylene sulfide) to increase molecular w

1986-11-21

1988-05-31

Anderson, Harold D.

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

Synthetic resins

Treating polymer containing material or treating a solid...

521 40, 528388, 528488, 528499, C08G 7514

Patent

active

047482311

ABSTRACT:
The molecular weight of linear and non-linear poly(arylene sulfide) PAS is increased by reprecipitation. The reprecipitation is accomplished by heating PAS to its dispersion temperature in a mixture of polar organic solvent, water, and alkali metal carboxylate until the PAS is dispersed in the mixture. Water is then added to cause a phase separation, then the total mixture is slowly cooled and a PAS of increased molecular weight is recovered. PAS slime, a waste product of some polymerization processes, can also be reprecipitated, as above, to recover useful particulate PAS that would normally be discarded.

REFERENCES:
patent: 3919177 (1975-01-01), Campbell
patent: 4071509 (1978-01-01), Edmonds, Jr.
patent: 4089847 (1978-05-01), Edmonds, Jr. et al.
patent: 4415729 (1983-11-01), Scoggins et al.
patent: 4524200 (1985-06-01), Sherk et al.

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