Process for controlling a particle size of polyarylene sulfide a

Details Process for controlling a particle size of polyarylene sulfide a Process for controlling a particle size of polyarylene sulfide a

1993-11-12

1995-12-12

Marquis, Melvyn I.

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

Synthetic resins

From sulfur-containing reactant

422138, 427180, C08G 7514

Patent

active

054750814

ABSTRACT:
A particle size of potyarylene sulfide obtained in polymerization is controlled by a process characterized in that a gaseous phase part of a reactor is cooled or heated after starting decreasing a temperature of a reaction system o an end of precipitation of polyarylene sulfide formed In an embodiment, a water content in the reaction system is 0.8 to 1.7 moles per mole of the alkali metal sulfide; the gaseous phase part of the reactor is cooled in a polymerization stage to thereby condense a part of a gaseous phase in the reactor and the condensed liquid is refluxed to a liquid phase in the reactor; and the gaseous phase part is only cooled after starting decreasing the temperature of the reaction system, whereby high molecular weight polyarylene sulfide suitable for powder coating is formed, which has a weight average molecular weight of at least 30,000 and an average particle size of 50 to 80 .mu.m, wherein particles of 40 to 150 .mu.m account for at least 90% by weight of the whole particles in a particle size distribution, and the amount of particles of 180 .mu.m or more is 0.5% by weight or less.

REFERENCES:
patent: 3919177 (1975-11-01), Campbell
patent: 4415729 (1983-11-01), Scoggins et al.
patent: 4645826 (1987-02-01), Iizuka et al.
patent: 5093469 (1992-03-01), Senga
patent: 5109110 (1992-04-01), Ogata et al.
patent: 5194580 (1993-03-01), Koyama et al.
patent: 5342920 (1994-08-01), Imai et al.
Japanese Patent Publ. No. 59-49232, 1984.
Japanese Patent Publ. No. 52-12240, Jan. 1977.

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