Patent ID: 6265361
Filing Date: 2001-07-24
Classification: C10M,C10N

Abstract:
A grease composition for motor bearings, comprising:(A) a thickener comprising, an alkali metal salt and/or an alkaline earth metal salt synthesized from a hydroxide of an alkali metal or an alkaline earth metal, and a higher fatty acid having 10 or more carbon atoms or a higher hydroxyfatty acid having at least one hydroxyl group and 10 or more carbon atoms; anda base oil comprising a mixture of a carbonate compound (B) and an ester-based synthetic oil (C);wherein the carbonate compound (B) is represented by the following general formula: ##STR8##wherein R and R' represent a branched alkyl group having 13-15 carbon atoms, and may be same or different; andwherein the ester-based synthetic oil (C) is selected from the group consisting of a diester-based synthetic oil represented by the following general formula:ROCO(CH.sub.2).sub.n COOR'wherein R and R' represent an alkyl group having 3-18 carbon atoms, and may be the same or different, and n is 3-12;a triester-based synthetic oil represented by the following general formula:C.sub.2 H.sub.5 C(CH.sub.2 OCOR).sub.3wherein R represents an alkyl group having 3-10 carbon atoms; and a tetraester-based synthetic oil represented by the following general formula:C(CH.sub.2 OCOR).sub.4wherein R represents an alkyl group having 3-10 carbon atoms; and other neopentyl polyol ester-based synthetic oil.