Oxygen-absorbing resin composition and packaging container, packaging material, cap or liner material having oxygen absorbability

Abstract

A thermoplastic resin composition containing an oxygen-absorbing agent, wherein a resin matrix of the thermoplastic resin composition is substantially non-compatible and is composed of a blend of thermoplastic resins or elastomers, and the non-compatible thermoplastic resins and elastomers are present as a non-uniformly distributed structure in the resin matrix. The packaging container or cap of this invention suppresses the lowering of flavor retention incident to the dissolving out of the oxygen absorbing agent or its oxidation product even after retorting sterization. The preservability of the contents and flavor retention can be achieved for a long period of time. According to a preferred embodiment, the oxygen absorbing speed can be increased. After storage for a long time, or after heat sterilization, a rugged state does not occur. There can be formed the oxygen-absorbing resin composition and the packaging container having excellent outer appearance.

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         16 . An oxygen-absorbing packaging material wherein from the inside of the packing toward the outside of the packing, a laminated body is obtained by conjugating a laminated body composed of a polyolefin inner surface material/an oxygen absorbing agent layer composed of a composition comprising a polyolefin and an oxygen absorbing agent/a polyolefin buffering layer, a laminated body composed of an aluminum foil and an oriented nylon and/or a polyester, or an inorganic vapor-deposited plastic film in a position relationship so that the aluminum foil or the inorganic vapor-deposited layer is opposed to the oxygen absorbing laminate.  
     
     
         17 . An oxygen-absorbing packaging material according to  claim 16  wherein the polyolefin in the oxygen-absorbing agent layer is composed of a plurality of blends of polyolefins which are substantially non-compatible, and the plurality of polyolefins form a non-uniformly distributed structure.  
     
     
         18 . An oxygen-absorbing packaging material according to  claim 17  wherein the polyolefins are a propylene-type polymer (A) and an ethylene-type polymer (B), and are a blend of polymers A:B in a weight ratio of 100:1 to 1:1.  
     
     
         19 . An oxygen-absorbing packaging material of  claim 16  wherein the oxygen absorbing agent is composed of the reducing iron powder and a layer of an oxygen promoting agent and a catalyst stuck to the surface of the reducing iron powder, and the oxygen promoting agent and the catalyst are present in an amount of 0.1 to 5% by weight based on the reducing iron powder, and the oxygen absorbing agent particle has a specific surface area of at least 0.5 m 2 /g and an apparent density of 2.2 g/cc.