Resin for oxygen-absorbing adhesive and oxygen-absorbing adhesive

1. A two-part curable oxygen-absorbing resin composition comprising:

(i) a main agent comprising a resin, wherein

the resin is a polyester comprising structural units derived from an acid component (A) and an acid component (B),

the ratio of the acid component (A) is 70% to 95% by mole relative to all acid components,

the ratio of the acid component (B) is 0% to 15% by mole relative to the all acid components, and

the glass transition temperature of the polyester is −20° C. to 0° C.; and

(ii) a curing agent component selected from the group consisting of aliphatic diisocyanates, alicyclic diisocyanates, and combinations thereof,

wherein:

the acid component (A) is a tetrahydrophthalic acid, a derivative thereof, a tetrahydrophthalic anhydride, or a derivative thereof, wherein the derivative is an ester, an acid halide, a substituted compound, or an oligomer and

the acid component (B) is a phthalic acid or an analog of the phthalic acid.

2. The two-part curable oxygen-absorbing resin composition according to claim 1 , wherein the acid component (A) is a methyltetrahydrophthalic acid, a derivative thereof, a methyltetrahydrophthalic anhydride, or a derivative thereof.

3. The two-part curable oxygen-absorbing resin composition according to claim 1 , wherein

the 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 tetrahydrophthalic acid, a derivative thereof, a tetrahydrophthalic anhydride, or a derivative thereof 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) an oxygen atom-containing functional group or a linking group derived from the functional group; and

(ii) a tetrahydrophthalic acid, a derivative thereof, a tetrahydrophthalic anhydride, or a derivative thereof 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 two-part curable oxygen-absorbing resin composition 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 two-part curable oxygen-absorbing resin composition according to claim 1 , wherein the resin is the polyester further comprising a structural unit derived from 1,4-butanediol.

6. The two-part curable oxygen-absorbing resin composition 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 two-part curable oxygen-absorbing resin composition according to claim 6 , wherein the aliphatic dicarboxylic acid is succinic acid or adipic acid.

8. An oxygen-absorbing adhesive comprising the two-part curable oxygen-absorbing resin composition according to claim 1 .

9. 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 1 ; and

a sealant film layer.