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AssigneeMoplefan S.p.A.
InventorsFosco Bordini, Luigi Mauri
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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.
Films of a polyolefin consisting essentially of isotactic macromolecules and carrying on at least one surface thereof a coating constituted by two layers, a first layer consisting of an alkylenimine polymer or a low molecular weight polyamine and a second layer consisting of a mixture of, by weight:
Process for improving the weld-resistance and resistance to sticking to the welding bars of a polyolefinic film, without altering its optical properties, which comprises applying to said film a first coating consisting of an alkylenimine polymer or a low molecular weight polyamine, and thereafter applying over the first coating a second coating consisting of a mixture of, by weight:
Dependencies are inferred from the claim text.