Biaxially oriented paraphenylene sulfide block copolymer film an

Details Biaxially oriented paraphenylene sulfide block copolymer film an Biaxially oriented paraphenylene sulfide block copolymer film an

1986-12-22

1988-10-11

Thurlow, Jeffery

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

Synthetic resins

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

2642356, 2642358, 2642893, 26433111, 428419, 428704, 525537, 528388, B29C 4700, B29C 5512, B29C 5514, C08G 7514

Patent

active

047772280

ABSTRACT:
Disclosed herein is a biaxially oriented paraphenylene sulfide block copolymer film showing a heat shrinkage of 0-2.0% at 100.degree.-220.degree. C., comprising a paraphenylene sulfide block copolymer essentially composed of recurring units (A): ##STR1## and recurring units (B): ##STR2## the molar fraction of recurring units (A) being 0.50-0.98, and having a melt viscosity (.eta.*) of 1,000-15,000 poises as measured at 310.degree. C. and shear rate of 200 sec.sup.-1, a glass transition temperature (Tg) of 20.degree.-80.degree. C., a crystalline melting point (Tm) of 250.degree.-285.degree. C. and a crystallization index (Ci) of 15-45 (measured with the non-stretched heat-treated polymer film), and a process for producing the biaxially oriented paraphenylene sulfide block copolymer film.

REFERENCES:
patent: 3869433 (1975-03-01), Campbell
patent: 3869434 (1975-03-01), Campbell et al.
patent: 4286018 (1981-08-01), Asakura et al.
patent: 4370469 (1983-01-01), Deguchi et al.
patent: 4426479 (1984-01-01), Deguchi et al.
patent: 4501713 (1985-02-01), Wright
patent: 4629778 (1986-12-01), Sugie et al.

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