Patent ID: 7750111

Claim:
A polyarylene sulfide having a weight average molecular weight of 10,000 or more, a polydispersity expressed as weight average molecular weight/number average molecular weight is 2.5 or less, weight loss when heated that satisfies the following equation: Δ Wr =( W 1− W 2)/ W 1×100≦0.18(%) (where Δ Wr is a weight loss ratio (%) and is determined from a sample weight (W2) at 330° C. and a sample weight (W1) at 100° C., when a thermogravimetric analysis is carried out from 50° C. to a predetermined temperature of 330° C. or more at a heating rate of 20° C/min in non-oxidizing atmosphere under ambient pressure) wherein the alkali metal content is 100 ppm or less.