Process for preparing modified polyphenylene sulfide resins

Details Process for preparing modified polyphenylene sulfide resins Process for preparing modified polyphenylene sulfide resins

C - Chemistry, Metallurgy

08

G

C08G 75/02 (2006.01) C08J 3/24 (2006.01) C08L 81/02 (2006.01) C08L 101/00 (2006.01)

Patent

CA 2071098

ABSTRACT OF THE DISCLOSURE: Melt viscosity of polyphenylene sulfide materials highly susceptible to curing reaction is increased at a moderate rate that is convenient for attaining a desirably increased melt viscosity at a precisely estimated time in the course of curing process. The curing process is carried out by heating the curing-susceptible polyphenylene sulfide material at about 190 - 270°C in a non-oxidizing, inert gas. The process is monitored by measuring the weight loss percentage of the material upon heating at intervals during the process. When a weight loss upon heating at 330°C for 30 minutes has dropped to a level of not greater than 0.4 wt.%, the curing process may be completed to give a cured PPS having a use-fully increased melt viscosity.

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