High-heat-resistant, crystalline block copolymers and production

Details High-heat-resistant, crystalline block copolymers and production High-heat-resistant, crystalline block copolymers and production

1990-12-26

1993-09-28

Marquis, Melvyn I.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528150, C08L 8104

Patent

active

052487431

ABSTRACT:
Disclosed herein are a poly(arylene thioether) block copolymer alternately comprising (A) at least one poly(arylene thioetherketoneketone) block having predominant recurring units of the formula ##STR1## and (B) at least one poly(arylene thioether) block having predominant recurring units of the formula ##STR2## (a) the ratio of the total amount of the poly(arylene thioether) block (B) to the total amount of the poly(arylene thioetherketone) block (A) being within a range of 0.1-9 by weight, (B) the weight average molecular weight of the poly(arylene thioether) block (B) being at least 1,000, and (c) said block copolymer having a melt viscosity of 2-100,000 poises as measured at 380.degree. C. and a shear rate of 1,200/sec as well as a production process of the block copolymer.

REFERENCES:
patent: 3442857 (1969-05-01), Thornton
patent: 4772679 (1988-09-01), Fukawa et al.
patent: 4795799 (1989-01-01), Cleary

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