Patent ID: 7361402

Claim:
A thermoformable film comprising a primer layer and at least one additional layer, said primer layer comprising a cross-linked adhesive polymer having a semicrystalline region and a polar region, said cross-linked adhesive polymer (i) having a tensile strength at maximum elongation that is less than that of an otherwise identical adhesive polymer that has not been cross-linked, and (ii) being a reaction product of co-polymerizable compounds comprising a first monomer and a second monomer, wherein the first monomer is an olefinic monomer having ethylenic unsaturation and the second monomer comprises acrylic acid, a C1 to C20 acrylate ester, an acrylate salt, (meth)acrylic acid, a C1 to C20 (meth)acrylate ester, a (meth)acrylate salt, or a combination thereof; said at least one additional layer comprising an outermost protective layer, said outermost protective layer comprising polyurethane or a thermoplastic fluorinated polymer.