Method for producing sheet molding compounds utilizing a multilayered, multistructured, multipolymer release / barrier film
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United States of America Patent
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Feb 11, 1997
Grant Date -
N/A
app pub date -
Sep 29, 1995
filing date -
Sep 29, 1995
priority date (Note) -
Expired
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Abstract
A method for producing SMC where a multilayered, multistructured, multipolymer release/barrier film is used as a polymeric film. The multilayered, multistructured, multipolymer release/barrier film is preferably produced by multilayered cast extrusion process. The tensile strength of the multilayered, multistructured, multipolymer release/barrier film should not be less than 8000 psi when tested to ASTM D882. Preferably, the film should inhibit styrene transmission at a rate no less than 2.0.times.10.sup.-11 g. cm/cm.sup.2 -hr. as tested per ASTM F739-81 and a surface tension level not to exceed 30 dynes/cm when tested in accordance with ASTM D2578.
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