DAMPING MATERIAL AND METHOD FOR PRODUCTION THEREOF

摘要

Provided is a vibration damping material comprising: a polyester resin containing dicarboxylic acid constitutional units and diol constitutional units; and mica being dispersed in the polyester resin, wherein: (1) a ratio [(A 1 + B 1 ) / (Ao + B 0 )] of a total of (A 1 ) a number of the dicarboxylic acid constitutional units having an odd number of carbon atoms in a polyester main chain and (B 1 ) a number of the diol constitutional units having an odd number of carbon atoms in the polyester main chain with respect to a total of (A 0 ) a number of total dicarboxylic acid constitutional units and (B 0 ) a number of total diol constitutional units in the polyester resin is in the range of 0. 5 to 1; and (2) an average particle diameter calculated from a volume-based particle diameter frequency distribution of the mica in the vibration damping material is 25 to 500 µm. The damping material has a high versatility, is lightweight, shows an excellent vibration damping property and can be produced easily with a batch mixer.