초록 ▼

A heat-sealable oriented plastic film comprising an oriented polypropylene film having on at least one surface a heat-sealable layer comprising a predominantly linear random copolymer of ethylene and up to 12 mole percent of at least one further alpha-olefin having at least three carbon atoms per mo

A heat-sealable oriented plastic film comprising an oriented polypropylene film having on at least one surface a heat-sealable layer comprising a predominantly linear random copolymer of ethylene and up to 12 mole percent of at least one further alpha-olefin having at least three carbon atoms per molecule.

대표청구항 ▼

A method of manufacturing an oriented film product comprising a layer consisting essentially of polypropylene and a layer of a heat-sealable copolymer layer on at least one surface thereof, which comprises the steps of (1) co-extruding through a die at least two melts, one of said melts comprising a

A method of manufacturing an oriented film product comprising a layer consisting essentially of polypropylene and a layer of a heat-sealable copolymer layer on at least one surface thereof, which comprises the steps of (1) co-extruding through a die at least two melts, one of said melts comprising a mixture of polypropylene and waste film from step (6), and a second of said at least two melts comprising a linear random copolymer of ethylene and up to 12 mole percent of at least one alpha olefin selected from the group consisting of propylene and butene-1; said co-extruded melts forming a multilayer film; (2) quenching said multilayer film; (3) heating said quenched multilayer film to a sufficient temperature for stretch orientation; (4) stretching said multilayer film in at least one direction to orient the polypropylene component in said multilayer film; (5) trimming said stretched multilayer film around its edges to produce both a waste film and the oriented film product; and (6) mixing said waste film with polypropylene to form said mixture of polypropylene and waste film used in step (1).