Cold sealable cohesive polymer coated polyolefin substrate

Claim 1

A coated polyolefin substrate which comprises a polyolefin film having a first side and a second side and a cold sealable, emulsion polymerized pressure sealable cohesive polymer composition for coating the first side of the substrate and an acrylic-based composition for coating the second side of the substrate, the polymer for coating the first side of the substrate comprising an acrylonitrile monomer and at least one of: (a) a soft monomer selected from the group consisting of methyl acrylate, ethyl acrylate, hexyl acrylate, iso-octyl acrylate, butyl acrylate, isobutyl acrylate, isopropyl acrylate and vinyl acetate; and (b) a monomer selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, crotonic acid, sulfoethyl methacrylate and maleic acid; the monomers being combined in weight percent amounts based on the total weight of the polymer sufficient to achieve a glass transition temperature of at least about -35° C., the weight percent amounts of the acrylonitrile monomer ranges from about 10 wt. % to about 65 wt. %, the weight percent amount of the (a) monomer ranges from about 30 wt. % to about 85 wt. % and the weight percent amount of the (b) monomer ranges from about 1 wt. % to about 3 wt. %, based on the total weight of the polymer, the polmer having low blocking tendencies to the acrylic-based formulation of the second side of the substrate.