Viscoelastic resin composition or vibration damping material

摘要

There is disclosed a viscoelastic resin composition for vibration damping material containing as essential components a polyester resin having a molecular weight of 5,000 to 50,000 and an acid value of 50 to 500 equivalents/106 g, at least 80 mol % of the polycarboxylic acid component of which is an aromatic dicarboxylic acid and, at least 30 mol % of the polyol component of which is a compound of the formula (I): H-(OR2)n-O-A-R1-A-O-(R2O)n-H(I) wherein R1 is oxygen or a straight or branched chain C1-6 alkylene group; R2 is a straight or branched C1-6 alkylene group; A is a group of the formula: (* CHEMICAL STRUCTURE *) (wherein R3 is hydrogen or a C1-6 alkyl group); and n is an integer of 1 to 6, an acid anhydride compound having at least two acid anhydride groups in a molecule, and an epoxy compound having at least two epoxy groups in a molecule.