To obtain a vibration-proof member excellent in vibration-proofness by using a thermoplastic material having specified compression set and loss tangent and by specifying the natural frequency of and the load applied to the member.
A hundred (100) pts.wt. hydrogenated styrene-ethylene/butylene- styrene block copolymer having an average mol.wt. of 150,000-400,000 is compounded with 40-500 pts.wt. softener (e.g. a naphthenic, paraffinic, or polyisobutylene oil) having an average mol.wt. of 450-5,000 and a solubility parameter different from that of the copolymer by 3.0 or lower, 10-250 pts.wt. polyphenylene ether resin, and if necessary an inorg. filler, a resin component (e.g. a polyolefin), a cross-linker, etc., and melt kneaded on a twin-screw extruder, etc., to give a thermoplastic material having a compression set (JIS 6301, at 70°C) of 50% or lower and a loss tangent (at 25°C and 5Hz) of 0.05 or higher. The material is molded into a desired shape to give a vibration-proof member which is used under a load of 0.1kgf or lower and has a natural frequency of 1-150Hz.
TOYOSAWA SHINICHI
FUKAHORI YOSHIHIDE
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