Antifog film laminates

DETAILED DESCRIPTION A laminate comprises a first substrate including a first layer of a blend of a polyolefin and an antifogging agent, and a bonding layer of a polyolefin; a second substrate bonded to the bonding layer of the first substrate and comprising polyester or polyamide; and a conventional adhesive between the first and second substrates; the laminate made by the steps of blending a polyolefin and an antifogging agent; coextruding the blend with a layer of a polyolefin to form a first substrate; corona pre-treating an exposed surface of the bonding layer soon after the coextrusion step; winding up the first substrate onto a roll; unwinding the first substrate; corona treating the pre-treated surface of the first substrate; applying a conventional adhesive to the treated surface of the first substrate, or the second substrate; and adhering the second substrate to the treated surface of the first substrate.
A process for making a laminate comprises blending a polyolefin and an antifogging agent; coextruding the blend with a layer of a polyolefin to form a first substrate; corona pre-treating an exposed surface of the bonding layer soon after the coextrusion step; winding up the first substrate onto a roll; unwinding the first substrate; corona treating the pre-treated surface of the first substrate; applying a conventional adhesive to the treated surface of the first substrate, or to a second substrate comprising a polyester or nylon; and adhering the second substrate to the treated surface of the first substrate.
DEFINITIONS The term "ethylene alpha olefin copolymer" (EAO) as used herein includes such heterogeneous materials as linear low density polyethylene [LLDPE], and very low and ultra low density polyethylene [VLDPE]; and homogeneous materials such as metallocene catalyzed polymers such as those supplied by Exxon, and Tafmer materials supplied by Mitsui.
These materials generally include copolymers of ethylene with one or more comonomers selected from C.
sub.
4 to C.
sub.
10 alpha olefins such as butene-1, hexene-1, octene-1, etc