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US 4,361,628 AGranted
Coextruded film of polypropylene, polypropylene blend, and nylon
AssigneeAmerican Can Company
InventorsDuane A. Krueger, Thomas W. Odorzynski
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Abstract
A novel coextruded plastic film has as an adhesive layer between polypropylene and nylon layers, a blend of polypropylene and a graft copolymer of maleic anhydride onto a polypropylene backbone, the graft copolymer having been produced in a reaction carried out at a temperature of from about 80.degree. C. up to about 10.degree. C. below the melting point of the polypropylene.
Claims4
A coextruded multiple layer plastic film comprising, in sequential order of layering:
- (a) polypropylene;
- (b) a functionally adhesive blend of a graft copolymer of maleic anhydride onto a polypropylene backbone and an ungrafted polypropylene, said graft copolymer having been produced in a reaction carried out at a temperature of from about 80.degree. Celsius up to about 10.degree. Celsius below the melting point of the polypropylene, said graft copolymer containing from about 0.5% to 5% maleic anhydride based on the total weight of the graft copolymer, said graft copolymer comprising between about 5% and 30% by weight of the blend, and said ungrafted polypropylene comprising between about 70% and 95% by weight of the blend;
- and
- (c) nylon.
1 more element
Dependencies are inferred from the claim text.