POLYESTER RESIN, AQUEOUS DISPERSION AND ADHESIVE COMPOSITION USING THE SAME
The present inventors conducted intensive studies for solving the problems. As a result, they found a heat-sealable polyester resin which can be used for food application and which exhibits excellent adhesiveness to various containers made of polystylene, polyvinyl chloride, A-PET (amorphous polyethylene terephthalate) , or polypropylene, each having different property. The aim of the present invention is to provide a polyester resin which exhibits excellent adhesiveness to various substrates such as polystylene, polyvinyl chloride, or A-PET. According to the present invention, there is provided a polyester resin containing a polycarboxylic acid component and a polyhydric alcohol component as constitution units, wherein, when the total amount of the polyhydric alcohol component is taken as 100 mol%, the content of diethylene glycol component is 60 mol% or more, and wherein the glass transition temperature of the polyester resin is 20° C. or lower.
1 . A polyester resin containing a polycarboxylic acid component and a polyhydric alcohol component as constitution units, wherein, when the total amount of the polyhydric alcohol component is taken as 100 mol%, the content of diethylene glycol component is 60 mol% or more, and wherein the glass transition temperature of the polyester resin is 20° C. or lower.
2 . An aqueous dispersion of polyester resin containing the polyester resin according to claim 1 .
3 . An adhesive composition containing the aqueous dispersion of polyester resin according to claim 2 .
4 . A laminated product prepared by laminating an adhesive layer formed of the adhesive composition according to claim 3 , and a thermoplastic resin film or an aluminum foil.
5 . The laminated product according to claim 4 , wherein the thickness of the adhesive layer is in the range of 1 to 10 µm.
6 . A packaging material comprising the laminated product according to claim 4 as a constituent component.
7 . A blister pack comprising the packaging material according to claim 6 as a constituent component.
8 . A lid member for a food packaging container comprising the packaging material according to claim 6 as a constituent component.
9 . A food packaging container constituted of a laminate of the lid member according to claim 8 and a polyester-based resin or an aluminum foil.