Coated polyolefinic films having low adhesion to the welding bars
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United States of America Patent
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Aug 20, 1985
Grant Date -
N/A
app pub date -
Apr 25, 1983
filing date -
Apr 26, 1982
priority date (Note) -
Expired
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Abstract
Films comprising alpha-olefin polymers, such as polypropylene consisting essentially of recurring propylene units and having a substantial crystalline polypropylene content, and in particular isotactic polypropylene, are rendered poorly adhesive to the welding bars of automatic and semi-automatic machines conventionally used for the manufacture of containers, envelopes, bags, vessels and, in general, other manufactured articles useful in the packaging industry, by coating the films by a mixture of a copolymer of a vinyl ester with an unsaturated acid, a terpolymer of an alkyl acrylate, an alkyl-methacrylate and an unsaturated acid and a cross-linking amine.
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