Opaque, laminated and stretched products, and method for making them
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United States of America Patent
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Nov 26, 1991
Grant Date -
N/A
app pub date -
Aug 15, 1990
filing date -
Aug 29, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Opaque laminated and stretched products having a total light transmittance of 50% or less are obtained by laminating at least one side of a layer obtained from a composition in which a crystalline polypropylene is blended with a cyclopentadiene type petroleum resin having a softening point of 160.degree. C. or higher, as measured by the ring-and-ball method, in an amount of 3 to 30% by weight based on the total weight of both, with a layer obtained from a crystalline propylene copolymer having a crystalline melting point lower than that of said crystalline polypropylene by 10.degree. C. or more, and, then, stretching the resulting laminate at a temperature lower than the crystalline melting point of the crystalline polypropylene and the softening point of the cyclopentadiene type petroleum resin and at a stretching ratio of 2 or higher in at least a uniaxial direction.
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