| 摘要 |
PROBLEM TO BE SOLVED: To provide a rubber composition for a vibration-proof rubber, which can achieve both of suppression of a secular change in a dynamic spring constant in an ultralow temperature region and long-term heat resistance.SOLUTION: The rubber composition for a vibration-proof rubber comprises a rubber component; and when the total amount of the rubber component is set to 100 parts by weight, the composition contains 4 to 40 parts by weight of a lithium catalyst-based polyisoprene rubber. The composition further preferably includes a Ziegler catalyst-based polyisoprene rubber by 30 to 80 parts by weight, and preferably includes a polybutadiene rubber by 10 to 30 parts by weight. The composition further preferably includes less than 0.6 parts by weight of a sulfur-based vulcanizing agent with respect to 100 parts by weight of the rubber component. |
