Process for producing poly(arylene sulfide)

Details Process for producing poly(arylene sulfide) Process for producing poly(arylene sulfide)

1997-02-11

1998-11-24

Marquis, Melvyn I.

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

Synthetic resins

From sulfur-containing reactant

C08G 7514

Patent

active

058408304

ABSTRACT:
The invention provides a process for producing a poly(arylene sulfide) comprising a dehydration step of heating and dehydrating a mixture containing an organic amide solvent (a), an alkali metal sulfide and water to control a water content in the mixture and a subsequent polymerization step of subjecting the alkali metal sulfide and a dihalo-aromatic compound to a polymerization reaction in the organic amide solvent (a), wherein hydrogen sulfide vaporized off during the dehydration step is absorbed in another organic amide solvent (b) outside a system in which the dehydration step is carried out, thereby recovering it, and the hydrogen sulfide thus recovered is reused in the polymerization reaction as a raw material for the alkali metal sulfide. The production process of the invention can solve various problems attendant upon the vaporization of hydrogen sulfide and provide a poly(arylene sulfide) which undergoes little variation in melt viscosity and has stable quality.

REFERENCES:
patent: 3354129 (1967-11-01), Edmonds, Jr. et al.
patent: 3783138 (1974-01-01), Miles et al.
patent: 3919177 (1975-11-01), Campbell
patent: 4371671 (1983-02-01), Anderson
patent: 4575387 (1986-03-01), Larue et al.

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