Process for producing polyarylene sulfide

Details Process for producing polyarylene sulfide Process for producing polyarylene sulfide

2007-05-22

2007-05-22

Truong, Duc (Department: 1711)

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

Synthetic resins

From sulfur-containing reactant

C528S397000, C528S487000, C528S499000, C528S503000, C210S660000

Reexamination Certificate

active

10520620

ABSTRACT:
A process for producing polyarylene sulfide includes: steps of reacting an aromatic dihalide compound and an alkaline metal compound in a polar organic solvent for polymerization under heating and cooling a system including the reaction mixture to recover particulate polyarylene sulfide (PAS). The system after the reaction is gradually cooled at an average cooling speed of 0.2 to 1.0 deg. C./min. selectively in a temperature range of from 1 deg. C. below to 1 deg. C. above a maximum system-viscosity temperature. As a result, the process can be operated at a relatively short polymerization cycle and yet provides the product PAS particles with a high and stable bulk density as to exhibit good processability in the transportation and storage, and excellent transportability in a hopper or a screw of an extruder or a molding machine.

REFERENCES:
patent: 4794164 (1988-12-01), Iwasaki et al.
patent: 5037954 (1991-08-01), Nesheiwat et al.
patent: 5312894 (1994-05-01), Kawakami et al.
patent: 0 259 984 (1988-09-01), None
patent: 0 436 120 (1991-07-01), None
patent: 0 568 366 (1993-11-01), None
patent: 10-87831 (1998-04-01), None

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