Silicone brake fluid having reduced air solubility

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

1985-11-25

1987-02-03

Wax, Robert A.

Compositions

Heat-exchange, low-freezing or pour point, or high boiling...

Organic components

252573, 556450, 556453, 556465, C10M10750

Patent

active

046407928

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.degree. 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.

REFERENCES:
patent: 2398187 (1946-04-01), McGregor et al.
patent: 3418353 (1968-12-01), Brown, Jr.
patent: 3440263 (1969-04-01), Brennan
patent: 3671433 (1972-06-01), Brenner
patent: 3673089 (1972-06-01), Wright
patent: 4137189 (1979-01-01), Holbrook et al.
patent: 4443351 (1984-04-01), Keil
Holbrook, G. W., "Alpine Testing of Silicone Brake Fluids," SAE Technical Paper Series 810803 (Jun. 8-12, 1981).
"Brake Fluid, Silicone, Automotive All Weather, Operational and Preservative," Military Specification MIL-B-46176, (3/27/78).
Browning, G. R., "Performance Characteristics of Silicone Based Brake Fluids," Society of Automotive Engineers 740128, (2/25-3/1/74).
"Federal Motor Vehicle Safety Standards and Regulations," Motor Vehicle Safety Standard No. 116, (Supplement 80-10/23/74).

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