Resin composition and multi-layer container using the same

Abstract

A resin composition obtained by blending a thermoplastic resin that can be melt-extruded at a solubility parameter of not smaller than 9.5 with an organic oxidizing component and with a transition metal catalyst, the organic oxidizing component being a polyene having a functional group on a side chain or at a terminal thereof. The resin composition has excellent moldability and gas shut-off property. A multi-layer container having an oxygen-absorbing layer of this resin composition exhibits excellent gas-barrier property and is capable of favorably preserving the content.

What is claimed is:  
     
         1 . A resin composition obtained by blending a thermoplastic resin that can be melt-extruded at a solubility parameter of not smaller than 9.5 with an organic oxidizing component and with a transition metal catalyst, said organic oxidizing component being a polyene having a functional group on a side chain or at a terminal thereof.  
     
     
         2 . A resin composition according to  claim 1 , wherein said the thermoplastic resin is a gas-barrier resin having an oxygen permeation coefficient of not larger than 7 cc·mm/m 2 ·day·atm (20° C., 0% RH).  
     
     
         3 . A resin composition accoring to  claim 1 , wherein said thermoplastic resin is a polyamide resin or an ethylene-vinyl alcohol copolymer.  
     
     
         4 . A resin composition according to  claim 1 , wherein said thermoplastic resin is a xylylene group-containing polyamide resin having a concentration of amino end groups of not smaller than 40 eq/10 6  g.  
     
     
         5 . A resin composition according to  claim 1 , wherein said organic oxidizing component is a polybutadiene or a polyisoprene modified with a maleic acid or with an anhydride thereof.  
     
     
         6 . A resin composition according to  claim 1 , wherein said organic oxidizing component is dispersed in the thermoplastic resin, and the dispersant thereof has a minimum length of not larger than 400 nm.  
     
     
         7 . A resin composition according to  claim 1 , wherein said transition metal catalyst is an organic salt of cobalt and is contained at a concentration of not smaller than 300 ppm calculated as a metal.  
     
     
         8 . A multi-layer container having at least one oxygen-absorbing layer of a resin composition of  claim 1 .  
     
     
         9 . A multi-layer container according to  claim 8 , wherein a layer of a polyolefin resin is formed on at least on side of said oxygen-absorbing layer.  
     
     
         10 . A multi-layer container according to  claim 8 , wherein a layer of a thermoplastic polyester resin is formed on at least one side of said oxygen-absorbing layer.  
     
     
         11 . A multi-layer container according to  claim 9 , wherein said polyester resin layer has a half-value width of an X-ray diffraction profile of not larger than 15°.  
     
     
         12 . A multi-layer continer according to  claim 9 , wherein said thermoplastic polyester resin has a crystallinity of from 30 to 55%.  
     
     
         13 . A multi-layer container having at least one oxygen-absorbing layer of a resin composition obtained by blending a thermoplastic resin that can be melt-extruded at a solubility parameter of not smaller than 9.5 with an organic oxidizing component and with a transition metal catalyst, said organic oxidizing component being a polyene having a functional group on a side chain or at a terminal thereof.  
     
     
         14 . The multi-layer container according to  claim 13 , wherein a layer of a polyolefin resin is formed on at least one side of said oxygen-absorbing layer.  
     
     
         15 . The multi-layer container according to  claim 13 , wherein a layer of a thermoplastic polyester resin is formed on at least one side of said oxygen-absorbing layer.  
     
     
         16 . The multi-layer container according to  claim 15 , wherein said thermoplastic polyester resin layer has a half-value width of an X-ray diffraction profile of not larger than 15°.  
     
     
         17 . The multi-layer container according to  claim 15 , wherein said thermoplastic polyester resin has a crystallinity of from 30 to 55%.  
     
     
         18 . The multi-layer container according to  claim 13 , wherein said thermoplastic resin is a polyamide resin or an ethylene-vinyl alcohol copolymer.  
     
     
         19 . The multi-layer container according to  claim 13 , wherein said thermoplastic resin is a xylylene group-containing polyamide resin having a concentration of amino end groups of not smaller than 40 eq/10 6  g.