Process for preparing polyphenylene sulfide resins

Details Process for preparing polyphenylene sulfide resins Process for preparing polyphenylene sulfide resins

1992-05-14

1993-08-17

Marquis, Melvyn I.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528388, C08G 7514, C08L 8104

Patent

active

052370224

ABSTRACT:
Brittleness of polyphenylene sulfide resins is significantly reduced and contrariwise toughness thereof is remarkably enhanced by a two-stage process which comprises the steps of subjecting a polyphenylene sulfide resin as synthesized to a thermal treatment under an inert atmosphere at a temperature above 200.degree. C. so as to give a substantially linearly grown polyphenylene sulfide resin having an increased melt viscosity of not less than 800 poises, and then curing the substantially linear resin by heating it under an oxidative atmosphere at a temperature above 200.degree. C. so as to produce a polyphenylene sulfide resin having a still more increased melt viscosity of not less than 5,000 poises.

REFERENCES:
patent: 3524835 (1970-08-01), Edmonds, Jr. et al.
patent: 3562199 (1971-02-01), Hill, Jr. et al.
patent: 3717620 (1973-02-01), Rohlfing
patent: 3793256 (1974-02-01), Scoggin
patent: 3839301 (1974-10-01), Scoggins
patent: 4274993 (1981-06-01), Narisawa et al.
patent: 4370471 (1983-01-01), Salmon
patent: 4383080 (1983-05-01), Dupree
Journal of Applied Polymer Science, vol. 39, pp. 1399-1415.
Japanese Patent Public Disclosure, KOKAI, No. 3-41152.

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