Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1995-09-29
1997-02-11
Stemmer, Daniel
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
264119, 264130, 264258, 264338, 428220, 4284744, B29C 3920, B29C 4330, B32B 2708, B32B 2734
Patent
active
056017707
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.
REFERENCES:
patent: 3895988 (1975-07-01), Miller
patent: 4474845 (1984-10-01), Hagerman
patent: 4568505 (1986-02-01), Bollen
patent: 4959189 (1990-09-01), Rohrbacher
patent: 5126085 (1992-06-01), Thorp
Airtech International Inc.
Hall Jeffrey A.
Stemmer Daniel
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