| abstract |
ABSTRACT OF THE DISCLOSURE: A functional fluid concentrate comprises: (a) a cloud point raising metal dialkyldithiophosphate additive having the following structural formula: wherein R1, R2, R3, and R4 are individually linear or branched alkyl, alkenyl, aryl, arylalkyl and alkylaryl groups having from 1 to 24 carbon atoms; and M is selected from the group consisting of Zn, Sb, Sn, Mg, and Mn; (b) a polyether nonionic surfactant; and (c) an associative polyether thickener. Preferably the concentrate also contains a linear or branched alkanolamine having 2 to 10 carbon atoms. Functional fluids, prepared by mixing the concentrates with water, 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. |