Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From sulfur-containing reactant
Patent
1986-01-06
1986-12-16
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From sulfur-containing reactant
26433111, C08G 7514
Patent
active
046297782
ABSTRACT:
A biaxially oriented crystalline poly(p-phenylene sulfide) film wherein said polymer contains at least 90 mole % of recurring units of the formula ##STR1## and has a melt viscosity of at least 0.12 dl/g and when said film is heat-treated at 270.degree. C. for 10 minutes under relaxation and then stretched at 23.degree. C. at a rate of 200%/min., its tensile strength, stress at 5% stretch and elongation show a percent retention of at least 60%, at least 80%, and 80 to 120%, respectively, based on these properties of the same film which has been stretched under said conditions without the heat-treatment; and a process for producing a crystalline poly(p-phenylene sulfide) film, which comprises heat-treating a biaxially oriented amorphous poly(p-phenylene sulfide) film at a temperature in the range of from 3.degree. C. above its melting point measured by a differential scanning calorimeter to 350.degree. C. at a constant length or under tension or in a moderate relaxed condition.
REFERENCES:
patent: 4286018 (1981-08-01), Asakura et al.
Kawamura Takashi
Kobata Fumihiro
Sugie Toshinori
Dainippon Ink and Chemicals Inc.
Marquis Melvyn I.
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