Patent ID: 6080705
Filing Date: 2000-06-27
Classification: C10M,C10N

Abstract:
A refrigerator oil having a volume resistivity of at least 10.sup.13 .OMEGA.cm and comprising: a polyhydric alcohol ester compound having an acid value of not more than 0.1 mg KOH/g as a lube base oil, and 0.5 to 4.5% by weight of at least one polyoxyalkylene compound represented by the following formula (1)R.sub.1 --O--(R.sub.2 --O--).sub.n --R.sub.3 ( 1)wherein R.sub.1 represents an alkyl group having 1 to 8 carbon atoms, R.sub.2 represents an alkylene group having 1 to 4 carbon atoms, R.sub.3 represents hydrogen or an alkyl group having 1 to 8 carbon atoms, n is a number representing the degree of polymerization corresponding to a molecular weight of 300 to 1200 of the polyoxyalkylene compound, --(R.sub.2 --O--).sub.n is a polymer containing not less than 50% of oxypropylene groups and the polyhydric alcohol ester compound is formed by reacting a monovalent saturated fatty acid or a mixture of a monovalent saturated fatty acid and a divalent saturated fatty acid with at least one polyhydric alcohol selected from the group consisting of neopentyl glycol, trimethylolpropane, pentaerythritol and dipentaerythritol.