Silicone brake fluid having reduced air solubility

Details Silicone brake fluid having reduced air solubility Silicone brake fluid having reduced air solubility

C - Chemistry, Metallurgy

10

M

253/136

C10M 107/50 (2006.01) C08G 77/04 (2006.01)

Patent

CA 1273334

SILICONE HYDRAULIC FLUID HAVING REDUCED AIR SOLUBILITY ABSTRACT A random siloxane copolymer composition, and a process for using the composition in a hydraulic brake system of a vehicle, is described. The random copolymer consists essentially of alkylmethylsiloxane and dimethylsiloxane units, wherein said alkyl group contains from five to ten carbon atoms, and the viscosity of said fluid is 15-50 cs at 25°C. Within a relatively narrow compositional range, these fluids dissolve at least 15% less air than comparable polydimethylsiloxane fluids. Moreover, the copolymer may be readily formulated into brake fluid compositions which meet Department of Transportation (DOT 5) and, in the case of preferred compositions, Military (MIL-B-46176) specifications. The potential benefit of reduced air solubility is an improved margin of safety under harsh driving conditions.

519616

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