Polyester resin, adhesive compositions containing the same, adhesive sheets, and laminates

Abstract

The object of this invention is to provide a polyester resin having high reducing viscosity or high molecular weight (Mw) and capable of forming a high crosslinking density. A polyester resin contains 0.5 to 10.0 mol% of a trivalent or higher polycarboxylic acid component in 100 mol% of the total polycarboxylic acid component, and the polyester resin has an acid value (AV) of 100 eq / t or higher, satisfying the following (i) and / or (ii): (i) The reducing viscosity of the polyester resin is 0.50 dl / g or higher; (ii) The weight average molecular weight (Mw) of the polyester resin is 79,000 or higher.