Process for produce a readily slidable film
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United States of America Patent
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Dec 19, 1995
Issued Date -
N/A
app pub date -
Dec 15, 1993
filing date -
Sep 14, 1989
priority date (Note) -
Expired
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Abstract
A process for the production readily slidable films which are stretched films. The process comprises (a) uniaxially stretching in a machine direction a pre-molded product comprising a composition of a styrene polymer having a high degree of syndiotactic configuration compounded with 0.001 to 1% by weight of inorganic filler particles with an average particle diameter of 0.01 to 3 .mu.m, or simultaneously, biaxially stretching the premolded product in the machine direction and the transverse direction and (b) subsequently uniaxially restretching the premolded product in the traverse direction or simultaneously, biaxially restretching the premolded product in the machine direction and the transverse to produce a film having a surface roughness Ra of 0.005 to 0.03 .mu.m, and a static friction coefficient .mu.s of 0.3 to 1.0. The readily slidable films have high heat resistance, mechanical strength and electrical insulating properties and are excellent in sliding properties and smoothness.
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