Closure Liner Composition With Improved Oxygen Reduction
AssigneeW.R. Grase S.A.
InventorsBeryl Bonnel, Estelle Bricout
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Abstract
Disclosed is a closure liner composition comprising a mixture (or blend) of a thermoplastic polymer, an oxygen barrier polymer, and a particulate oxygen scavenging material. The oxygen barrier polymer preferably comprises polyisobutylene. The particulate oxygen scavenging material preferably is selected from the group consisting of an alkali metal salt of sulfite, ascorbate, isoascorbate, and a mixture of two or more of these materials. The closure liner composition may be used to fabricate a liner for a closure (e.g., a metal crown used to cap a bottle) that provides superior oxygen reduction properties and improved shelf life.
Claims11
A closure liner composition comprising a thermoplastic polymer, an oxygen barrier polymer, and a particulate oxygen scavenging material.
The closure liner composition according to any preceding claim wherein the thermoplastic polymer comprises one or more polymers selected from the group consisting of polyethylene, polypropylene, ethylene propylene copolymer, styrene butadiene rubber, carboxylated styrene butadiene, polyisoprene, styrene isoprene styrene block copolymer, styrene butadiene styrene block copolymer, styrene ethylene butylene styrene block copolymer, ethylene vinyl acetate copolymer, ethylene (meth) acrylate copolymer, ethylene vinyl alcohol copolymer, vinyl chloride homopolymer or copolymer, styrene acrylic polymer, polyamide, and vinyl acetate polymer, and blends of one or more of these.
The closure liner composition according to any preceding claim wherein the oxygen barrier polymer consists essentially of polyisobutylene.
The closure liner composition according to any preceding claim wherein the particulate oxygen scavenging material comprises sodium sulfite.
Dependencies are inferred from the claim text.