RUBBER COMPOSITION FOR VIBRATION-PROOF RUBBER

摘要

PROBLEM TO BE SOLVED: To provide a rubber composition for vibration-proof rubbers which can suppress change of the dynamic spring constant with time in the very low temperature range.SOLUTION: A rubber composition for vibration-proof rubbers comprises 100 pts. wt. of a rubber ingredient and 1-5 pts. wt. of paraffin wax, and the paraffin wax is wax separated from vacuum distillation distillate oil and refined. The rubber ingredient comprises 10-30 pts. wt. of polybutadiene rubber and 70-90 pts. wt. of polyisoprene rubber, and the rubber composition contains less than 1.0 pt. wt. of a sulfur-based vulcanizer to 100 pts. wt. of the rubber ingredient.