Silicone fluid compositions having reduced viscosity temperature

Details Silicone fluid compositions having reduced viscosity temperature Silicone fluid compositions having reduced viscosity temperature

1990-06-21

1992-07-14

Lieberman, Paul

Compositions

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

Organic components

252496, 252573, 524264, C09K 500, C10M10576

Patent

active

051300419

ABSTRACT:
Silicone hydraulic compositions, comprising a polydimethylsiloxane fluid and a phenylmethylsiloxane/dimethylsiloxane copolymer having a viscosity at least ten fold greater than said polydimethylsiloxane fluid and having a molar phenylmethylsiloxane content of about 4.5 percent to about 7 percent are disclosed. The fluids exhibit a reduced viscosity temperature coefficient (VTC) relative to conventional polydimethylsiloxane oils and are useful in hydraulic applications such as viscous coupling and viscous damping.

REFERENCES:
patent: 2491843 (1949-12-01), Wilcock
patent: 2614989 (1952-10-01), Hunter et al.
patent: 3231532 (1966-01-01), Modic
patent: 4171267 (1979-10-01), McAfee et al.
patent: 4207246 (1980-06-01), Hafner
patent: 4585705 (1986-04-01), Broderick
patent: 4696756 (1987-09-01), Yoshitake
patent: 4840743 (1989-06-01), Gardiner
patent: 4943601 (1990-07-01), Dinallo
Ivanova, N., et al., "Study of the Viscous Flow of Dimethylsiloxane Polymer & Rubber Solutions Over A Wide Range of Deformation Rates", Journal of the Theoretical & Experimental Chemistry and Physics of Macromolecular Compounds, 18 Mar. 1968, pp. 1145-1149.

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