Patent ID: 6168862
Filing Date: 2001-01-02
Classification: B29C,B32B,C08L,Y10T

Abstract:
A multiple layer thermoplastic structure suitable for manufacturing medical products comprising: (1) a skin layer being selected from a group consisting of a polypropylene and polypropylene copolymers; (2) a radio frequency susceptible layer comprising: (a) a propylene-containing polymer, (b) at polyolefin selected from the group consisting of ethylene copolymers, ultra-low density polyethylene, polybutene, butene ethylene copolymers; (c) a radio frequency susceptible polymer selected from the group consisting of polyamides, ethylene vinyl acetate with a vinyl acetate content in an amount from 18-50% by weight, ethylene methyl acrylate copolymers with methyl acrylate comonomer contents from 20%-40% by weight, ethylene vinyl alcohol with vinyl alcohol in an amount from 15%-70% mole percent, (d) a compatibilizing agent of a styrene and hydrocarbon block copolymer; and (e) wherein the radio frequency susceptible layer having a dielectric loss greater than 0.05 at 1-60 MHz and at temperatures of ambient to 250.degree. C.; (3) a barrier layer positioned between the skin layer and the radio frequency susceptible layer; and wherein the multiple layer structure has a mechanical modulus of less than 40,000 psi when measured according to ASTM D-882.