Laminated olefinic polymer sheets for packaging
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United States of America Patent
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Jul 8, 1980
Grant Date -
N/A
app pub date -
Dec 19, 1977
filing date -
Dec 20, 1976
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There is disclosed a bonded sheet for packaging, having a thickness ranging from 20 to 200 microns, a low transmittance, a low permeability to gases and vapors, a high resistance to perforation, and high anti-static characteristics, said bonded sheet consisting essentially of two films prepared from substantially crystalline polyolefin polymers or mixtures thereof and, optionally, from an interposed adhesive layer, wherein at least one of the two films is a film oriented by the stretching of polypropylene essentially constituted by isotactic macromolecules and having a melt index between 0.5 and 5, and wherein at least one of the two films is coated, on the surface thereof which is in contact with the other film, with a metallized layer (preferably aluminum) having a resistivity between 1 and 5 Ohms. One of the two films may be a film, optionally oriented by stretching, prepared from a polymer selected from the class consisting of a polyethylene having a melt index of from 0.5 to 15, a polypropylene having a melt index of from 5 to 20, a crystalline propylene-ethylene copolymer containing from 0.1 to 15% by weight of ethylene and having a melt index of from 3 to 20, and mixtures thereof.
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