Patent ID: 6221451
Filing Date: 2001-04-24
Classification: B32B,B65D,Y10T

Abstract:
A stopper or closure for a product retaining container constructed for being inserted and securely retained in a portal forming neck of the container, said stopper/closure comprising:A. an elongated, cylindrically shaped core member formed from foamed plastic material and comprising terminating end surfaces forming the opposed ends of the cylindrically shaped core member; andB. at least one layera. peripherally surrounding and intimately bonded to the cylindrical surface of the core member with the end surfaces of the core member being devoid of said layer, andb. comprising at least one thermoplastic polymer selected from the group consisting of polyethylenes, metallocene catalyst polyethylenes, polybutanes, polybutylenes, polyurethanes, silicones, vinyl-based resins, thermoplastic elastomers, polyesters, ethylenic acrylic copolymers, ethylene-vinyl-acetate copolymers, ethylene-methyl-acrylate copolymers, thermoplastic polyurethanes, thermoplastic olefins, thermoplastic vulcanizates, flexible polyolefins, fluorelastomers, fluoropolymers, polyethylenes, polytetrafluoroethylenes, and blends thereof, ethylene-butyl-acrylate copolymers, ethylene-propylene-rubber, styrene butadiene rubber, ethylene-ethyl-acrylic copolymers, ionomers, polypropylenes, and copolymers of polypropylene and copolymerizable ethylenically unsaturated comonomers;whereby a multi-layer/multi-component synthetic closure is attained which is capable of completely sealing any desired product in a container, retaining the product in the container for any desired length of time without any degradation of the product or degradation of the closure.