Stock material or miscellaneous articles – Composite – Of addition polymer from unsaturated monomers
Patent
1979-03-28
1981-10-13
McCamish, Marion
Stock material or miscellaneous articles
Composite
Of addition polymer from unsaturated monomers
428516, 428517, 428519, 428521, 428910, B32B 2708
Patent
active
042948894
ABSTRACT:
A biaxially-stretched polypropylene composite film comprises a biaxially-stretched substrate film of a crystalline polypropylene and a monoaxially- or biaxially-stretched film of a resin composition bonded in laminated state to at least one surface of the substrate film, the resin composition comprising 96 to 50 percent (by weight) of a propylene copolymer (a), 3 to 30 percent of a polybutene-1 (b), and 1 to 20 percent of an ethylene-propylene-butene-1 random copolymer (c). The propylene copolymer (a) is an ethylene-propylene random copolymer (a.sub.1), an ethylene-propylene-butene-1 random copolymer (a.sub.2), or a mixture (a.sub.3) of at least two kinds of copolymers each of at least two monomers selected from ethylene, propylene, and butene-1. The resin composition comprising the components (a), (b) and (c) is also provided and is characterized by its capability of being heat sealed at low temperatures.
REFERENCES:
patent: 4117193 (1978-09-01), Tsuchiya
Adams Bruce L.
Burns Robert E.
Lobato Emmanuel J.
McCamish Marion
Mitsubishi Petrochemical Co. Ltd.
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