POLYESTER COMPOSITION FOR LUBRICANT OIL, PRODUCTION THEREOF AND LUBRICANT OIL COMPOSITION

摘要

PURPOSE: To obtain a polyester composition for lubricant oil having excellent lubricity with reduced decrease in viscosity on temperature up and resistance to strength reduction in the oil membrane, thus being useful as an oil for cold- rolling metal. ;CONSTITUTION: This composition is obtained by partially esterifying (A) 1 mole of an n-hydric polyol (n is 3-6) (trimethylolpropane) with (B) a fatty acid such as oleic acid in such an amount that the residual hydroxyl groups becomes 2-2.5 theoretically, further allowing (C) a dibasic acid such as adipic acid to react with the reaction mixture in an amount of 0.7-1.0 moles, thus has the molar ratio of (A):(B):(C)=1:(n-2)-(n-2.5):0.7-1.0 and a viscosity of 3,000-25,000 cps at 25°C. In a preferred embodiment, 0.01-1.0 mole of a monohydric alcohol is allowed to react with residual carboxyl groups in the polyester and the ratio of the weight-average molecular weight to the number-average molecular weight is 50 or less.;COPYRIGHT: (C)1996,JPO