Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1997-07-09
1999-03-30
Dawson, Robert A.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
428461, 428 359, 428 353, 4283197, 428327, 428334, 428910, B32B 502
Patent
active
058886400
ABSTRACT:
A metallized uniaxially heat-shrinkable, biaxially oriented, multilayer film having a polypropylene-containing core layer comprising at least 70 wt. % of said multilayer film and at least one polyolefin-containing skin layer adjacent said core layer is prepared by biaxially orienting a coextrudate and thereafter orienting said coextrudate by stretching 10 to 40% in the machine direction. The core layer contains isotactic polypropylene and a modifier which reduces the crystallinity of the polypropylene by increasing chain imperfections or reducing isotacticity of the polypropylene-containing core. Such modifiers can be selected from the group consisting of atactic polypropylene, syndiotactic polypropylene, ethylene-propylene copolymer, propylene-butene-1 copolymer, ethylene-propylene-butene-1 terpolymer, and linear low density polyethylene. The skin layer can be high density polyethylene or ethylene-propylene-butene-1 terpolymer. A metallized layer, such as aluminum, is deposited on the corona treated skin layer.
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Marotta David Michael
Szkapi Walter W.
Williams David Randall
Cuomo Lori F.
Dawson Robert A.
Lu-Rutt Caixia
Mobil Oil Corporation
Santini Dennis P.
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