VIBRATION-INSULATION RUBBER COMPOSITION

摘要

PURPOSE:To obtain the titled composition having excellent vibration-absorption characteristics and fatigue resistance, by compounding an isoprene-butadiene copolymer with natural rubber and polyisoprene rubber at specific ratios. CONSTITUTION:The objective composition contains (A) 20-90pts.wt., preferably 30-80pts.wt. of an isoprene-butadiene copolymer containing >=90% of cis-1,4- bond and obtained by polymerizing monomer in the presence of a lanthanide rare earth metal catalyst (preferably a catalyst composed of a lanthanide rare earth metal compound and an organoaluminum compound) and (B) 80-10pts.wt., preferably 70-20pts.wt. of natural rubber and/or polyisoprene rubber.