Pellet for oxygen-absorbing resin composition and oxygen-absorbing resin composition

Abstract

A high-quality oxygen-absorbing resin composition which is obtained without suffering resin scorching. Also provided are pellets for the oxygen-absorbing resin composition which comprise a thermoplastic resin (A) and an oxidation catalyst. After the pellets are mixed with a trigger resin and a thermoplastic resin (C), the trigger resin functions as a trigger to cause the oxidation of the thermoplastic resins (A) and (C) to proceed. As a result, the resultant composition absorbs oxygen.

1 . A pellet for the oxygen-absorbing resin composition which comprise a thermoplastic resin (A) and an oxidation catalyst wherein when the pellet is mixed with a trigger resin and a thermoplastic resin (C), the trigger resin functions as a trigger to cause the oxidation of the thermoplastic resins (A) and (C) to proceed, whereby oxygen is absorbed. 
     
     
         2 . A multilayer pellet for the oxygen-absorbing resin composition which comprises a core part containing a thermoplastic resin (A) and an oxidation catalyst and a coating part containing a thermoplastic resin (B) wherein when the pellet is mixed with a trigger resin and a thermoplastic resin (C), the trigger resin functions as a trigger to cause the oxidation of the thermoplastic resins (A), (B) and (C) to proceed, whereby oxygen is absorbed. 
     
     
         3 . The pellet of  claim 2 , wherein the pellet has a core-in-sheath structure. 
     
     
         4 . The pellet of  claim 2 , wherein the pellet has a core-shell structure. 
     
     
         5 . The pellet of  claim 2 , wherein the oxidation catalyst is a transition metal catalyst. 
     
     
         6 . The pellet of  claim 5 , wherein the transition metal catalyst is cobalt stearate. 
     
     
         7 . The pellet of  claim 2 , wherein the thermoplastic resin (A) comprises a polyethylene. 
     
     
         8 . The pellet of  claim 2 , wherein the thermoplastic resin (A) is a linear low density polyethylene obtained by copolymerizing ethylene with not less than 4% by mass of a 1-alkene having 3 to 6 carbon atoms. 
     
     
         9 . An oxygen-absorbing resin composition obtainable by mixing the pellet of  claim 2 , a thermoplastic resin (C) and a trigger resin which functions as a trigger of oxidation. 
     
     
         10 . An oxygen-absorbing resin composition obtainable by mixing a masterbatch containing a thermoplastic resin (A) and an oxidation catalyst, a thermoplastic resin (C) and the trigger resin which functions as a trigger of the oxidation, wherein the trigger resin functions as a trigger to cause the oxidation of the thermoplastic resin (C) to proceed, whereby oxygen is absorbed. 
     
     
         11 . The oxygen-absorbing resin composition of  claim 10 , wherein the mixing is melt kneading. 
     
     
         12 . The oxygen-absorbing resin composition of  claim 10 , wherein the thermoplastic resin (C) comprises at least two polyethylenes and at least one of these polyethylenes is a linear low density polyethylene obtained by copolymerizing ethylene with not less than 4% by mass of a 1-alkene having 3 to 6 carbon atoms. 
     
     
         13 . The oxygen-absorbing resin composition of  claim 10 , wherein the trigger resin (C) is a styrene resin. 
     
     
         14 . The oxygen-absorbing resin composition of  claim 10 , wherein the styrene resin is a hydrogenated styrene-diene copolymer. 
     
     
         15 . The oxygen-absorbing resin composition of  claim 14 , wherein the hydrogenated styrene-diene copolymer is a hydrogenated styrene-butadiene-styrene block copolymer. 
     
     
         16 . The oxygen-absorbing resin composition of  claim 10 , wherein the styrene resin comprises two kinds of styrene resins which are different in the styrene content from one another.