Resin for Oxygen-absorbing Adhesive and Oxygen-absorbing Adhesive

Abstract

The purpose of the present invention is to provide a two-component curable oxygen-absorbing resin composition that has both oxygen-absorbing and adhesive properties and cohesive power. The resin for an oxygen-absorbing adhesive is a polyester comprising structural units derived from an acid component (A) and an acid component (B), wherein the ratio of the acid component (A) to total acid components is 70 to 95 mol %, the ratio of the acid component (B) to total acid components is 0 to 15 mol %, the polyester has a glass transition temperature of −20° C. to 2° C., the resin is cured using a hardening agent, the acid component (A) is tetrahydrophthalic acid or a derivative thereof, or tetrahydrophthalic acid anhydride or a derivative thereof, and the acid component (B) is phthalic acid.

1 . A resin for an oxygen-absorbing adhesive, wherein
 the resin is a polyester comprising structural units derived from a first acid component (A) and a second acid component (B),   the ratio of the first acid component (A) is 70% to 95% by mole relative to all acid components,   the ratio of the second acid component (B) is 0 to 15% by mole relative to all acid components,   the glass transition temperature of the polyester is −20° C. to 2° C., and   the resin is intended to be used after being cured with a curing agent:   the first acid component (A) is a tetrahydrophthalic acid, a derivative thereof, a tetrahydrophthalic anhydride, or a derivative thereof, and   the second acid component (B) is a phthalic acid.   
     
     
         2 . The resin for an oxygen-absorbing adhesive according to  claim 1 , wherein the first acid component (A) is a methyltetrahydrophthalic acid, a derivative thereof, a methyltetrahydrophthalic anhydride, or a derivative thereof. 
     
     
         3 . The resin for an oxygen-absorbing adhesive according to  claim 1 , wherein
 the first acid component (A) contains 50% by mole or more of an acid component having a structure selected from the group consisting of (i) and (ii):   (i) a dicarboxylic acid or dicarboxylic anhydride having a carbon atom which is bonded to both groups having the following structures (a) and (b) and also which is bonded to one or two hydrogen atoms, the carbon atom being included in an alicyclic structure:   (a) a carbon-carbon double bond group,   (b) a hetero atom-containing functional group or a linking group derived from the functional group; and   (ii) a dicarboxylic acid or dicarboxylic anhydride in which   a carbon atom adjacent to a carbon-carbon double bond in an unsaturated alicyclic structure is bonded to an electron-donating substituent and a hydrogen atom,   another carbon atom adjacent to the carbon atom is bonded to a hetero atom-containing functional group or a linking group derived from the functional group, and   the electron-donating substituent and the hetero atom-containing functional group or the linking group derived from the functional group are in a cis configuration.   
     
     
         4 . The resin for an oxygen-absorbing adhesive according to  claim 3 , wherein
 the acid component having the structure of (i) is 4-methyl-Δ 3 -tetrahydrophthalic acid, a derivative thereof, 4-methyl-Δ 3 -tetrahydrophthalic anhydride, or a derivative thereof, and   the acid component having the structure of (ii) is cis-3-methyl-Δ 4 -tetrahydrophthalic acid, a derivative thereof, cis-3-methyl-Δ 4 -tetrahydrophthalic anhydride, or a derivative thereof.   
     
     
         5 . The resin for an oxygen-absorbing adhesive according to  claim 1 , wherein the resin is the polyester further comprising a structural unit derived from 1,4-butanediol. 
     
     
         6 . The resin for an oxygen-absorbing adhesive according to  claim 1 , comprising a structural unit derived from an aliphatic dicarboxylic acid, which is a further acid component, in an amount of 1% to 30% by mole relative to the all acid components. 
     
     
         7 . The resin for an oxygen-absorbing adhesive according to  claim 6 , wherein the aliphatic dicarboxylic acid is succinic acid or adipic acid. 
     
     
         8 . A two-part curable oxygen-absorbing resin composition comprising:
 a main agent comprising the resin for an oxygen-absorbing adhesive according to  claim 1 ; and a curing agent component.   
     
     
         9 . An oxygen-absorbing adhesive comprising:
 the two-part curable oxygen-absorbing resin composition according to  claim 8 .   
     
     
         10 . An oxygen-absorbing laminated film comprising at least:
 an oxygen barrier film layer;   an oxygen-absorbing layer made of the oxygen-absorbing adhesive according to  claim 9 ; and   a sealant film layer.