Patent ID: 8030388

Claim:
A vibration damping material, comprising a resin composition obtained by dispersing titanium dioxide (Y) and a mica flake (Z) in a polyester resin (X) containing dicarboxylic acid constitutional units and diol constitutional units, wherein: (1) in the polyester resin (X), a ratio of a total of a number of the dicarboxylic acid constitutional units (A 1 ) having an odd number of carbon atoms in a main chain and a number of the diol constitutional units (B 1 ) having an odd number of carbon atoms in a main chain with respect to a total of a number of total dicarboxylic acid constitutional units (A 0 ) and a number of total diol constitutional units (B 0 ), i.e., [(A 1 +B 1 )/(A 0 +B 0 )] is in a range of 0.5, to 1; (2) a ratio (B 1 /B 0 ) of (B 1 ) the number of the diol constitutional units having an odd number of carbon atoms in the main chain with respect to (B 0 ) the number of the total diol constitutional units in the polyester resin (X) is in a range of 0.5 to 1.0; (3) a mass ratio (X:Y:Z) of the polyester resin (X), the titanium dioxide (Y), and the mica flake (Z) is in a range of 15 to 40:5 to 30:30 to 80; and (4) the titanium dioxide has an average particle diameter of 0.01 to 0.5 μm.