FILM-FORMING OLEFIN POLYMER COMPOSITIONS

摘要

1495776 Laminates IMPERIAL CHEMICAL INDUSTRIES Ltd 11 June 1976 [11 June 1975] 25010/75 Heading B5N [Also in Divisions B2 and C3] Multilayer heat-sealable products comprise a substrate film of a C 2-6α-olefin polymer having bonded to at least one face thereof a film of a composition comprising (1) a copolymer of 80-95% propylene with a C 4-10α-olefin and (2) 25-90% of a polymer of a C 4-10α-olefin with 0-10% of a C 2-10α-olefin. Bonding may be effected by means of adhesives or by coextruding the substrate polymer and composition. The products or substrate films may be biaxially stretched and heat set. In examples substrate films of polypropylene or reprocessed triple layer film having films of blends of propylene / butene- 1 copolymers with polybutene - 1 or butene - 1 / ethylene copolymers bonded to both faces thereof are formed by coextrusion.