Silicone hydraulic fluids and additive concentrates therefor

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

1982-11-01

1984-04-17

Kittle, John E.

Compositions

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

Organic components

252 327E, 252 496, 252 783, 556451, 556453, 556456, 556459, C10M 344, C10M 150

Patent

active

044433514

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 polydimethylsiloxane and blocks of polybutadiene or hydrogenated polybutadiene. These compositions are useful as concentrates for replenishing polydiorganosiloxane 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.

REFERENCES:
patent: 2495362 (1950-01-01), Barry et al.
patent: 3308093 (1967-03-01), Lentz
patent: 3759827 (1973-09-01), Groenhof et al.
patent: 4097393 (1978-06-01), Cupper et al.
patent: 4137189 (1979-01-01), Holbrook et al.
patent: 4155864 (1979-05-01), Martin
patent: 4357252 (1982-11-01), Huber et al.

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