Polyolefin films with a high resistance to sticking against welding bars having a top coating comprising a combination of an epoxy resin, an acrylic resin and nitrocellulose
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United States of America Patent
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Nov 4, 1980
Grant Date -
N/A
app pub date -
Oct 23, 1978
filing date -
Oct 24, 1977
priority date (Note) -
Expired
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Abstract
Films comprising alpha-olefin polymers, such as normally solid polypropylene consisting essentially of recurring propylene units and having a substantial crystalline polypropylene content, and in particular isotactic polypropylene, are rendered easily thermoweldable and/or impervious to gases and vapors, and also given improved resistance to sticking against the welding bars of automatic and semi-automatic machines conventionally used for the manufacture of containers, envelops, bags, vessels and, in general, other manufactured articles useful in the packaging industry, by coating the films with a first layer comprising a polyalkyleneimine and a second layer comprising a mixture of an epoxy resin, an acrylic or methacrylic polymer or copolymer, and nitrocellulose.
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