Electroviscous fluids

US4668417A · kind A · utility

Assignees

• BAYER HEALTHCARE LLC · DE
• Metzeler Kautschuk GmbH · DE

Inventors

• John Goossens · Cologne, DE
• G/u/ nter Oppermann · Leverkusen, DE
• Wolfgang Podszun · Neunburg vorm Wald, DE
• Volker H/a/ rtel · Germering, DE

Key dates

• Filing date: Apr 24, 1986
• Grant date: May 26, 1987
• Expiry date: Apr 24, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10N2040/185
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

An electroviscous fluid comprising more than 25% by weight of silica gel with a water content of 1 to 15% by weight, a non-conductive oily phase dispersion medium, 1 to 30% by weight of one or more polymers soluble in the dispersion medium, the weight percentage being based on the water-containing silica gel, and the polymers having a molecular weight in the range of from 5.times.10.sup.3 to 10.sup.6 and containing 0.1 to 10% by weight of N and/or OH and 25 to 83% by weight of C.sub.4 to C.sub.24 -alkyl groups. Such electroviscous fluids are useful for transmitting powerful forces by means of a low electronic output, for example, in hydraulic valves and shock absorbers.