Patent ID: 6193906
Filing Date: 2001-02-27
Classification: C10M,C10N

Abstract:
A refrigerating oil composition comprising: (A) a base oil, and (B) 0.1-30 wt. % of a polyalkylene glycol derivative of formula (I) having a number average molecular weight of 200-3,000:R.sup.1 --(OR.sup.2).sub.m --(OR.sup.3).sub.n --OR.sup.4 (I)wherein each of R.sup.1 and R.sup.4 represents a C1-C30 hydrocarbon group or acyl group, or hydrogen; R.sup.2 represents a C2-C4 alkylene group; R.sup.3 represents a C2-C30 alkylene group which may or may not be substituted; m and n are numbers that satisfy the above-described molecular weight conditions, wherein n may be 0; and at least one of R.sup.1, R.sup.3, and R.sup.4 has a hydrocarbon group having six or more carbon atoms, and the base oil is selected from the group consisting of polyvinyl ether, carbonate derivative, polyether ketone, and mixtures thereof.