Process for stabilizing the molecular weight of linear or option

Details Process for stabilizing the molecular weight of linear or option Process for stabilizing the molecular weight of linear or option

1992-03-02

1993-08-17

Anderson, Harold D.

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

Synthetic resins

From sulfur-containing reactant

528 86, 528226, 528271, 528486, 528487, C08G 7516

Patent

active

052370461

ABSTRACT:
The invention relates to a process for stabilizing the molecular weight of high molecular weight, optionally branched polyarylene sulfides prepared by reaction of aromatic dihalogen compounds and, optionally, aromatic trihalogen or tetrahalogen compounds and, optionally, polymer-chain-terminating monomers with alkali metal sulfides and/or alkali metal hydrogen sulfides at elevated temperature in aprotic polar solvents, characterized in that, after the desired molecular weight has been reached, alkali metal sulfides and/or alkali metal hydrogen sulfides present in excess are at least partly reacted with acids to form the alkali metal salts of the acids and hydrogen sulfide.

REFERENCES:
patent: 3783138 (1974-01-01), Miles et al.
patent: 4656231 (1987-04-01), Tieszen et al.
patent: 4877850 (1989-10-01), Geibel et al.
patent: 4920201 (1990-04-01), Jakob et al.

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