Improved coextrudable adhesive and products therefrom

Claim 1

An extrudable bonding resin composition consisting essentially of: (a) about 35 to about 84 percent by weight of an ethylene copolymer portion consisting essentially of (i) about 1 to 100 percent by weight of a copolymer of about 45 to about 95 weight percent ethylene and about 5 to about 55 weight percent of at least one comonomer copolymerized therewith selected from the group consisting of unsaturated mono- or dicarboxylic acids of 2-20 carbon atoms, esters of said unsaturated mono- or dicarboxylic acids, vinyl esters of saturated carboxylic acids where the acid group has 1-18 carbon atoms, acrylonitrile, methacrylonitrile, and carbon monoxide, the carbon monoxide being present in an amount of 0 to about 30 weight percent; and a grafted comonomer containing pendant carboxylic acid or carboxylic acid derivative functionality, wherein the amount of said grafted comonomer comprises about 0.03 to about 0.5 percent by weight of the total bonding resin composition, and (ii) 0 to about 99 percent by weight of a copolymer of about 45 to about 95 weight percent ethylene and about 5 to about 55 weight percent of at least one comonomer copolymerized therewith selected from the group consisting of unsaturated mono- or dicarboxylic acids of 2-20 carbon atoms, esters of said unsaturated mono- or dicarboxylic acids, vinyl esters of saturated carboxylic acids where the acid group has 1-18 carbon atoms, acrylonitrile, methacrylonitrile, and carbon monoxide, the carbon monoxide being present in an amount of 0 to about 30 weight percent, wherein the copolymer of (i) and the copolymer of (ii) contain at least one said copolymerized comonomer in common, the amount of each such common comonomer in the copolymer of (ii) being within about 10% of the amount of the corresponding comonomer in copolymer (i), and the total amount of said copolymerized comonomers other than such common comonomers in either copolymer being less than about 10%; (b) about 15 to about 45 percent by weight polystyrene; and (c) about 1 to about 25 weight percent of a saturated alicyclic hydrocarbon resin modifier having a degree of saturation of at least about 80%.