Patent ID: 8609763

Claim:
A resin composition for vibration damping material comprising: 100 parts by weight of a resin component A as a matrix; and 5 to 300 parts by weight of a resin component B dispersed in the matrix, wherein the resin component B has two or more cyclic structures selected from the group consisting of an aromatic hydrocarbon group, an aliphatic cyclic hydrocarbon group, and a heteroaromatic group and is in a glassy state at use temperature for vibration damping, and wherein the resin component A has a glass transition temperature lower than the use temperature for vibration damping, and the resin component B is semi-compatible with the resin component A and has a number average molecular weight of 400 to 8000; wherein the resin composition meets one of the following requirements: (i) the use temperature for vibration damping is −10 to 50° C. and a glass transition temperature of the resin component B is 50 to 180° C.; (ii) the use temperature for vibration damping is 20 to 80° C. and a glass transition temperature of the resin component B is 80 to 200° C.; and (iii) the use temperature for vibration damping is 50 to 100° C. and a glass transition temperature of the resin component B is 150 to 200° C.