CRYSTALLINE POLYESTER RESIN AND ADHESIVE COMPOSITION USING THE SAME
The present invention aims to provide an adhesive composition excellent in storage stability, adhesiveness, blocking resistance, and water resistance. A crystalline polyester resin containing a polycarboxylic acid component and a polyhydric alcohol component as copolymerization components, wherein 30 to 70 mol % of terephthalic acid and 10 to 60 mol % of 1,4-cyclohexanedicarboxylic acid are contained as the polycarboxylic acid component, and 50 mol % or more of 1,4-butanediol is contained as the polyhydric alcohol component, wherein the acid value of the crystalline polyester resin is 100 to 600 eq/t, wherein the glass transition temperature of the crystalline polyester resin is −30 to 30° C., and wherein the melting point of the crystalline polyester resin is 70 to 160° C.
1 . A crystalline polyester resin containing a polycarboxylic acid component and a polyhydric alcohol component as copolymerization components, wherein 30 to 70 mol % of terephthalic acid and 10 to 60 mol % of 1,4-cyclohexanedicarboxylic acid are contained as the polycarboxylic acid component, and 50 mol % or more of 1,4-butanediol is contained as the polyhydric alcohol component, wherein the acid value of the crystalline polyester resin is 100 to 600 eq/t, wherein the glass transition temperature of the crystalline polyester resin is −30 to 30° C., and wherein the melting point of the crystalline polyester resin is 70 to 160° C.
2 . The crystalline polyester resin according to claim 1 , wherein the content of an aromatic dicarboxylic acid component having a sulfonate group as the polycarboxylic acid component is less than 1 mol %.
3 . An aqueous dispersion of polyester resin containing the crystalline polyester resin according to claim 1 .
4 . An adhesive composition containing the aqueous dispersion of polyester resin according to claim 3 .
5 . A laminated film formed by laminating the adhesive composition according to claim 4 and a thermoplastic resin film.
6 . The laminated film according to claim 5 , wherein the thermoplastic resin film is a polyester-based resin film.
7 . The laminated film according to claim 5 , wherein the thickness of a layer of the adhesive composition is in the range of 1 to 10 μm.
8 . A packaging material comprising the laminated film according to claim 5 as a constituent component.
9 . A lid member for a food packaging container comprising the packaging material according to claim 8 as a constituent component.
10 . A food packaging container constituted of a laminate of the lid member according to claim 9 and a polyester-based resin.