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US 5,474,714 AGranted
Non-polluting shock absorber and level controller fluids
AssigneeRWE-DEA Aktiengesellschaft fur Mineraloel und Chemie
InventorsDietrich Pirck, Hans-Dieter Grasshoff
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Abstract
The present invention relates to hydraulic fluids which are particularly intended for shock absorption and level controlling applications in vehicles. Hydraulic fluids are provided which substantially consist of esterification products of monosaturated fatty acids and 2-alkyl-1-alkanols. The claimed fluids comply with the requirements made on industrial hydraulic media and are particularly outstanding by their good biodegradability.
Claims5
A method of using esterification products in a hydraulic fluid in vehicles, comprising the steps of:
- preparing esterification products of oleic acid and 2-alkyl-1-alkanols with 12 to 20 carbon atoms as biologically degradable base fluids having:
- a viscosity index of at least 150;
- a pour point equal to or less than -40.degree. C.;
- and
- a maximum viscosity of 2,000 mPa.s at -40.degree. C.;
- combining the esterification products with ecologically compatible additives to form a hydraulic fluid;
- and
- adding the hydraulic fluid to vehicles.
5 more elements
Dependencies are inferred from the claim text.