Patent ID: 8815363
Filing Date: 2014-08-26
Classification: B32B,F16L,Y10T

Abstract:
1. A thermoplastic multilayer structure comprising at least three layers comprising (a) a first surface layer comprising a soft thermoplastic composition with melting point in a range from about 70 to about 90° C. and Shore A hardness (ASTM D2240, ISO 868) from about 80 to about 90 comprising metallocene-catalyzed very low density polyethylene with a density of 0.86 to 0.91 g/cm (b) a second surface layer comprising a thermoplastic ethylene acid terpolymer comprising an E/X/Y terpolymer wherein E represents copolymerized units of ethylene, X is present in an amount of about 2 to about 30 weight % of the E/X/Y polymer and represents copolymerized units of a C (c) is an interior layer of a material comprising a thermoplastic composition with melting point in a range from about 75 to about 150° C., and moisture vapor permeation value less than 2 g·mil/100 in (d) is at least one tie layer positioned in contact with one of the surface layers and in contact with one other layer, comprising a coextrudable composition comprising (1) a polyolefin graft copolymer comprising a trunk polymer comprising polyethylene, polypropylene, styrene-ethylene-butene-styrene triblock copolymer, polybutadiene or a copolymer comprising copolymerized units of ethylene and copolymerized units of vinyl acetate, alkyl acrylate or alkyl methacrylate; wherein the alkyl groups have from 1 to 8 carbon atoms, wherein the trunk polymer is modified by grafting thereto a cyclic anhydride of C (2) a blend of (i) a polyolefin selected from the group consisting of polyethylene homopolymer, polyethylene copolymer, or polypropylene copolymer and (ii) an ethylene acid terpolymer comprising an E/X/Y copolymer wherein E represents copolymerized units of ethylene, X is present in an amount of about 2 to about 30 weight % of the E/X/Y polymer and represents copolymerized units of a C