Polyarylene sulfide and its production method
AssigneeToray Industries, Inc.
InventorsShunsuke Horiuchi, Koji Yamauchi
Life of this patent
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Abstract
A polyarylene sulfide has a narrow molecular weight distribution and a high molecular weight and high purity which is industrially useful, wherein the polyarylene sulfide has a weight average molecular weight of 10,000 or more, and weight loss when heated, ΔWr=(W1−W2)/W1 × 100≦0.18(%) (wherein ΔWr is weight loss ratio (%), W1 is sample weight when arrived at 100° C. and W2 is sample weight when arrived at 330° C.). Its production method includes a polyarylene sulfide prepolymer which contains a cyclic polyarylene sulfide at least 50 wt % or more, and of which weight average molecular weight is less than 10,000 is heated to be converted to a high polymer of which weight average molecular weight is 10,000 or more.
Claims24
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:
- ΔWr=(W1−W2)/W1×100≦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.
A method of producing polyarylene sulfide comprising:
- providing a polyarylene sulfide prepolymer having a weight average molecular weight less than 10,000 and which contains at least 50 wt % or more of a cyclic polyarylene sulfide;
- and
- heating the prepolymer in the absence of a catalyst to be converted to a polymer of which weight average molecular weight is 10,000 or more.
A method of producing polyarylene sulfide comprising:
- providing a polyarylene sulfide prepolymer having a weight average molecular weight less than 10,000 and which contains at least 50 wt % or more of a cyclic polyarylene sulfide;
- and
- heating the prepolymers to be, converted to a polymer of which weight average molecular weight is 10,000 or more,
- wherein an obtained polyarylene sulfide has 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:
- ΔWr=(W1−W2)/W1×100≦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.
A method of producing polyarylene sulfide comprising:
- providing a polyarylene sulfide prepolymer having a weight average molecular weight less than 10,000 and which contains at least 50wt % or more of a cyclic polyarylene sulfide;
- and
- heating the prepolymers in the absence of a catalyst to be converted to a polymer of which weight average molecular weight is 10,000 or more,
- wherein an obtained polyarylene sulfide has 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:
- ΔWr=(W1−W2)/W1×100≦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).
Dependencies are inferred from the claim text.