# US 2014/0191453 A1 · Vibration-damping rubber composition, and liquid-filled vibration-damping rubber device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0191453 A1 - Document ID: US20140191453A1 - Status: Published application - Kind: A1 - Application number: 14/202,593 - Filed: 2014-03-10 - Published: 2014-07-10 - Earliest claimed: 2012-02-27 - Assignees: Tokai Rubber Industries, Ltd. - Applicants: Tokai Rubber Industries, Ltd. - Inventors: Hiroaki Naiki; Toyohisa Toyama; Norihito Kimura - Web page: https://patentgrep.com/patent/US20140191453A1 ## CPC - F16F 1/3605: {characterised by their material (F16F1/362, F16F1/364, F16F1/366, F16F1/37 take precedence; composition of macromolecular compounds in general C08L)} - C08K 3/22: of metals - C08K 5/0016: {Plasticisers} - C08K 5/01: Hydrocarbons {(C08K5/0091 takes precedence)} - F16F 13/085: {characterised by features of plastics springs; Attachment arrangements} - F16F 13/10: the wall being at least in part formed by a flexible membrane or the like (F16F13/14 - F16F13/18 take precedence) - C08L 91/00: Compositions of oils, fats or waxes; Compositions of derivatives thereof - F16F 2224/025: Elastomers - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## 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. ## Claims ### Claim 1 A vibration-damping rubber composition to be 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 comprising: (A) a chloroprene rubber as a major component; and (B) an aromatic hydrocarbon plasticizer. ### Claim 2 (depends on 1) The vibration-damping rubber composition according to claim 1, wherein the aromatic hydrocarbon plasticizer (B) has a viscosity of 9 to 70 mm2/s (at 98.9° C.). ### Claim 3 (depends on 1) The vibration-damping rubber composition according to claim 1, wherein the aromatic hydrocarbon plasticizer (B) is present in a proportion of 3 to 30 parts by weight based on 100 parts by weight of the chloroprene rubber (A). ### Claim 4 (depends on 1) The vibration-damping rubber composition according to claim 1, wherein the chloroprene rubber (A) is at least one selected from the group consisting of a xanthogen-modified chloroprene rubber, a mercapto-modified chloroprene rubber and a sulfur-modified chloroprene rubber. ### Claim 5 (depends on 1) The vibration-damping rubber composition according to claim 1, wherein the aromatic hydrocarbon plasticizer (B) comprises an aromatic hydrocarbon in a proportion of at least 32 wt % based on an overall weight of the plasticizer. ### Claim 6 (depends on 1) The vibration-damping rubber composition according to claim 1, further comprising at least one reinforcing material selected from the group consisting of carbon black, calcium carbonate, talc and clay. ### Claim 7 (depends on 1) The vibration-damping rubber composition according to claim 1, further comprising a reinforcing material in a proportion of 5 to 100 parts by weight based on 100 parts by weight of the chloroprene rubber (A). ### Claim 8 (depends on 1) The vibration-damping rubber composition according to claim 1, further comprising at least one crosslinking agent selected from the group consisting of zinc oxide, magnesium oxide and lead oxide. ### Claim 9 (depends on 1) The vibration-damping rubber composition according to claim 1, further comprising a crosslinking agent in a proportion of 0.5 to 5 parts by weight based on 100 parts by weight of the chloroprene rubber (A). ### Claim 10 (depends on 1) The vibration-damping rubber composition according to claim 1, further comprising at least one vulcanization accelerating agent selected from the group consisting of a thiazole vulcanization accelerating agent, a sulfenamide vulcanization accelerating agent, a thiuram vulcanization accelerating agent, an aldehyde ammonia vulcanization accelerating agent, an aldehyde amine vulcanization accelerating agent, a guanidine vulcanization accelerating agent and a thiourea vulcanization accelerating agent. ### Claim 11 (depends on 1) The vibration-damping rubber composition according to claim 1, further comprising a vulcanization accelerating agent in a proportion of 0.1 to 10 parts by weight based on 100 parts by weight of the chloroprene rubber (A). ### Claim 12 (depends on 1) The vibration-damping rubber composition according to claim 1, further comprising at least one vulcanization acceleration assisting agent selected from the group consisting of zinc oxide, active zinc white and stearic acid. ### Claim 13 (depends on 1) The vibration-damping rubber composition according to claim 1, further comprising a vulcanization acceleration assisting agent in a proportion of 0.1 to 10 parts by weight based on 100 parts by weight of the chloroprene rubber (A). ### Claim 14 (depends on 1) The vibration-damping rubber composition according to claim 1, further comprising at least one anti-aging agent selected from the group consisting of a carbamate anti-aging agent, a phenylenediamine anti-aging agent, a phenol anti-aging agent, a diphenylamine anti-aging agent, a quinoline anti-aging agent, an imidazole anti-aging agent and a wax. ### Claim 15 (depends on 1) The vibration-damping rubber composition according to claim 1, further comprising an anti-aging agent in a proportion of 0.1 to 10 parts by weight based on 100 parts by weight of the chloroprene rubber (A). ### Claim 16 (depends on 1) The vibration-damping rubber composition according to claim 1, further comprising at least one acid accepting agent selected from the group consisting of magnesium oxide, a hydrotalcite, a zeolite, aluminum hydroxide, calcium oxide, calcium hydroxide, aluminum oxide, calcium carbonate, calcium silicate, basic silicon dioxide, magnesium hydroxide and zinc oxide. ### Claim 17 (depends on 1) The vibration-damping rubber composition according to claim 1, further comprising an acid accepting agent in a proportion of 1 to 10 parts by weight based on 100 parts by weight of the chloroprene rubber (A). ### Claim 18 (depends on 1) A liquid-filled vibration-damping rubber device comprising: a rubber member which defines a sealed space therein and is deformable according to inputted vibrations; and a glycol liquid sealingly contained in the sealed space; wherein the rubber member is formed from the vibration-damping rubber composition according to claim 1. ### Claim 19 (depends on 18) The liquid-filled vibration-damping rubber device according to claim 18, wherein the sealingly contained glycol liquid comprises at least one of ethylene glycol (EG) and propylene glycol (PG). ### Claim 20 (depends on 18) The liquid-filled vibration-damping rubber device according to claim 18, wherein the sealingly contained glycol liquid is a mixture prepared by mixing ethylene glycol (EG) and propylene glycol (PG) wherein a mixing weight ratio of EG/PG is from 7/3 to 5/5.