Abstract: A vibration isolation rubber composition containing the following components (B) to (E) together with a polymer made of a component (A) below is provided. Accordingly, it is possible to achieve both heat resistance and a low dynamic-to-static modulus ratio at a high level without impairing durability. In the vibration isolation rubber composition, (A) is a diene rubber, (B) is a filler, (C) is a dihydrazide compound, (D) is any one of a (meth)acrylic acid monomer, zinc oxide, and zinc (meth)acrylate, and (E) is a sulfur vulcanizing agent.

Abstract: An anti-vibration rubber composition includes the following components (A) to (C) and a sliding agent, wherein the sliding agent includes the following component (D), and wherein a content of the component (C) with respect to 100 parts by weight of the component (A) falls within a range of from 0.1 parts by weight to 10 parts by weight: (A) a diene rubber; (B) carbon black; (C) a white filler; and (D) an organopolysiloxane-modified polypropylene. The anti-vibration rubber composition can eliminate a reduction in sliding property due to a temperature environment or continuous use, and can effectively suppress an increase in frictional resistance against a mating member.

Abstract: An anti-vibration rubber composition includes the following components (A) to (C) and a sliding agent, wherein the sliding agent includes the following component (D), and wherein a content of the component (C) with respect to 100 parts by weight of the component (A) falls within a range of from 0.1 parts by weight to 10 parts by weight: (A) a diene rubber; (B) carbon black; (C) a white filler; and (D) an organopolysiloxane-modified polypropylene. The anti-vibration rubber composition can eliminate a reduction in sliding property due to a temperature environment or continuous use, and can effectively suppress an increase in frictional resistance against a mating member.

Abstract: A vibration-damping rubber composition is provided, which is used as a material for a rubber member of a liquid-filled vibration-damping rubber device in which a glycol liquid is sealingly contained. The rubber composition comprises: (A) a chloroprene rubber as a major component; and (B) an aromatic hydrocarbon plasticizer. The rubber composition makes it possible to suppress increase in the hardness of the rubber member (chamber wall) after thermal aging and reduction in durability.

Abstract: Provided is a fluid-filled vibration damping rubber device, including enclosed spaces (primary fluid chamber and auxiliary fluid chamber) formed by chamber walls (vibration damping rubber body and rubber membrane) which deform in accordance with vibration input, the enclosed spaces being filled with a fluid, in which: the chamber walls each include a diene-based rubber; and the fluid includes a glycol-based solution containing a benzotriazole-based compound having an amine group. The fluid-filled vibration damping rubber device is capable of eliminating the degradation of the chamber walls (rubber bodies) and the deterioration of its durability due to the dissolution of components in the rubber bodies into the filling fluid.

Abstract: A vibration-damping rubber composition is provided, which is used as a material for a rubber member of a liquid-filled vibration-damping rubber device in which a glycol liquid is sealingly contained. The rubber composition comprises: (A) a chloroprene rubber as a major component; and (B) an aromatic hydrocarbon plasticizer. The rubber composition makes it possible to suppress increase in the hardness of the rubber member (chamber wall) after thermal aging and reduction in durability.