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

Abstract

The purpose of this invention is to provide a polyester resin with excellent thermal stability, high reducing viscosity, and the ability to form a high crosslinking density. A polyester resin contains at least 2.0 mol% of a tricarboxylic acid component in 100 mol% of all polycarboxylic acid components, has a reducing viscosity of 0.50 dl / g or higher, and an acid value (AV) of 150 eq / t or higher, satisfying the following (i) and / or (ii): (i) the acid value (AVd) of the carboxyl groups of the dicarboxylic acid components constituting the main chain of the polyester is 50 eq / t or higher; (ii) the hydroxyl value (OHV) is 80 eq / t or lower.