Patent ID: 6869653

Claim:
A multiple layered non-PVC containing tubing comprising: a first layer of a polymer blend composed of: (a) from about 25% to about 50% by weight of the first layer of a first polyolefin selected from the group consisting of polypropylene and polypropylene copolymers, (b) from about 1 to about 50% by weight of the first layer of a second polyolefin selected from the group consisting of ethylene copolymers, ultra-low density polyethylene, polybutene, polybutadiene and butene ethylene copolymers; (c) from about 1% to about 40% by weight of the first layer of a radio frequency susceptible polymer selected from the group consisting of polyamides, ethylene acrylic acid copolymers, ethylene methacrylic acid copolymers, polyimides, polyurethanes, polyesters, polyureas, ethylene vinyl acetate copolymers with a vinyl acetate comonomer content from 12%-50% by weight of the copolymer, ethylene methyl acrylate copolymers with methyl acrylate comonomer content from 12%-40% by weight of the copolymer, ethylene vinyl alcohol copolymer with vinyl alcohol comonomer content from 12%-70% by mole percent of the copolymer; (d) from about 1% to about 40% of a first thermoplastic elastomer; and a second layer disposed coaxially within the first layer and being a second thermoplastic elastomer composed solely of a styrene and diene copolymer.