Process for preparation of polyphenylene-sulfide resins in the a

Details Process for preparation of polyphenylene-sulfide resins in the a Process for preparation of polyphenylene-sulfide resins in the a

1989-10-16

1991-12-10

Anderson, Harold D.

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

Synthetic resins

From sulfur-containing reactant

528387, 528487, 528492, C08G 7516

Patent

active

050719491

ABSTRACT:
Disclosed is a process for the preparation of polyphenylene-sulfide resins, wherein an aromatic polyhalide compound is reacted with an alkali metal sulfide, or hydrogen sulfide and an alkali metal base, or an alkali metal hydrosulfide and an alkali metal base in the presence of an amide polar solvent. A polyphenylene-sulfide resin having a cyclic oligomer content lower than 1.5% by weight, as determined according to the methylene chloride extraction method, is obtained by (a) carrying out the reaction in the absence a polymerization assistant, (b) using the amide polar solvent in an amount not larger than 400 g per mole of the aromatic polyhalide compound, and (c) subjecting the polymerization liquid obtained by the reaction to hot solid-liquid separation at a temperature at least 50.degree. C. but lower than the boiling point of the solvent used, and washing the separated solid with the solvent used for the reaction, which is heated at a temperature at least 50.degree. C. but lower than the boiling point of the solvent.

REFERENCES:
patent: 3800845 (1974-04-01), Scoggin
patent: 3956060 (1976-05-01), Scoggin
patent: 4025496 (1977-05-01), Anderson et al.
patent: 4415729 (1983-11-01), Scoggin et al.
patent: 4464507 (1984-08-01), Ostlinning et al.
patent: 4495332 (1985-01-01), Skiiki et al.
patent: 4524200 (1985-06-01), Sherk et al.
patent: 4595748 (1986-06-01), Ostlinning et al.
patent: 4631336 (1986-12-01), Idel et al.

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