Opaque, laminated and stretched products, and method for making

Details Opaque, laminated and stretched products, and method for making Opaque, laminated and stretched products, and method for making

1990-08-15

1991-11-26

Cashion, Jr., Merrell C.

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

428516, 428517, 428910, B32B 2708

Patent

active

050681559

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.

REFERENCES:
patent: 4293608 (1981-10-01), Isaka et al.
patent: 4921749 (1990-05-01), Bossaert et al.

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