Polyarylene sulfide preparation in titanium reaction vessel with

Details Polyarylene sulfide preparation in titanium reaction vessel with Polyarylene sulfide preparation in titanium reaction vessel with

1987-07-31

1989-03-14

Anderson, Harold D.

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

Synthetic resins

Polymerizing in reactor of specified material, or in reactor...

528 86, 528206, 528226, 528388, C08G 7516

Patent

active

048125393

ABSTRACT:
Disclosed herein is a process for producing a medium- or high-molecular-weight polyarylene sulfide which comprises subjecting an alkali metal sulfide, a dihalo aromatic compound and optionally, small amount of tri- or higher polyhalo aromatic compound to dehalogenation and sulfidation reaction at a temperature of from 235.degree. to 280.degree. C. in the presence of a water in amount of from 0.5 to 5 mol per 1 kg of an aprotic organic polar solvent until the conversion of said dihalo aromatic compound reaches from 70 to 98 mol %, thereby forming a polyarylene sulfide prepolymer having a melt viscosity of from 5 to 300 poise (as measured at 310.degree. C. under a shear rate of 200 sec.sup.-1), adding water to the resultant reaction mixture containing the polyarylene sulfide prepolymer so that from 6 to 15 mol of water is present per 1 kg of said solvent, and then continuing the reaction at a temperature of from 240.degree.-290.degree. C., in which the reaction comprising said two steps is conducted for from 1 to 10 hours.

REFERENCES:
patent: 3354129 (1967-11-01), Edmonds et al.
patent: 3919177 (1975-11-01), Campbell
patent: 4116947 (1978-09-01), Edmonds et al.
patent: 4495332 (1985-01-01), Shiiki et al.
patent: 4645826 (1987-02-01), Iizuka et al.
patent: 4745167 (1988-05-01), Iizuka et al.

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