Silicone hydraulic fluids and additive concentrates therefor

Details Silicone hydraulic fluids and additive concentrates therefor Silicone hydraulic fluids and additive concentrates therefor

C - Chemistry, Metallurgy

10

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253/136

C10M 107/50 (2006.01) C10M 131/10 (2006.01) C10M 161/00 (2006.01) C10M 169/04 (2006.01)

Patent

CA 1227786

SILICONE HYDRAULIC FLUIDS AND ADDITIVE CONCENTRATES THEREFOR Abstract Compositions are disclosed consisting essentially of: (A) a polydiorganosiloxane fluid in which the organic radicals are predominantly or wholly methyl radicals; (B) a chlorendate diester; (C) a lubricant compound which is an antimony or lead compound of a dialkyldithiocarbamate or dialkylphosphorodithioate; and (D) a block copolymer comprising blocks of polydi- methylsiloxane and blocks of polybutadiene or hydrogenated polybutadiene. These compositions are useful as concentrates for replenishing polydiorgano- siloxane hydraulic fluids that have become depleted in additives (B) and (C), and as hydraulic fluids having improved resistance to settling of the lubricant compound at low temperatures.

434944

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