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US 4,797,229 AGranted
Functional fluids containing associative polyether thickeners, certain dialkyl-dithiophosphates, and a compound which is a source of molybdate ion
AssigneeBASF SE
InventorsMark A. Frentrup, Joseph R. Gibson, James E. Carson, Pauls Davis
Life of this patent
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Abstract
The invention relates to thickened fuctional fluids. The functional fluids can be used in hydraulic systems or as metalworking compositions to cool and lubricate surfaces which are in frictional contact during operations such as the turning, cutting, peeling, or grinding of metals. The functional fluid contains a diluent, a dialkyldithiophosphate, a compound which is a source of molybdate ion, a polyether nonionic surfactant, and an associative polyether thickener.
Claims8
A functional fluid which comprises
- (a) a dialkyldithiophosphate having the following structural formula:
- ##STR2## wherein R is individually a linear or branched alkyl, alkenyl, aryl, arylalkyl, or alkylaryl groups having from 1 to 24 carbon atoms;
- (b) from 0.2 part to 3.0 parts by weight of a compound which is a soure of molybdate ion;
- (c) from 0.5 part to 10.0 parts by weight of a polyether nonionic surfactant;
- and
- (d) from 0.01 part to 20.0 parts by weight of an associative polyether thickeners, said weight of components (a), (b), (c), and (d) based upon 1.0 part by weight of the dialkyldithiophosphate;
- and
- (e) a diluent in an amount such that from about 60 to about 99 percent of the fluid is water, or a mixture of water and a freezing point lowering additive.
5 more elements
Dependencies are inferred from the claim text.