HYDRAULIC FLUIDS FORMED FROM A BLEND OF A COMPLEX ALCOHOL ESTER AND OTHER BASESTOCKS

摘要

A hydraulic fluid which is prepared from: (1) a lubricating oil which comprises (a) a complex alcohol ester which comprises the reaction product of a polyhydroxyl compound represented by the general formula: R(OH)n wherein R is any aliphatic or cyclo-aliphatic hydrocarbyl group and n is at least 2, provided that said hydrocarbyl group contains from about 2 to 20 carbon atoms; a polybasic acid or an anhydride of a polybasic acid; and a branched and/or linear monohydric alcohol, provided that said alcohol is added in an amount which is less than 20 % excess and wherein the concentration of the polybasic acid ester is less than or equal to 70 wt.%, based on said complex alcohol ester; and (b) at least one additional basestock; and (2) an additive package; wherein the hydraulic fluid exhibits improved biodegradability, lubricity, higher viscosity, and/or non-toxicity.