Patent ID: 6100226
Filing Date: 2000-08-08
Classification: C10M,C10N

Abstract:
An improved grease composition comprising a major amount of an oil-based, simple metal soap thickened base grease and(A) from about 0.25% to about 10% by weight of an overbased metal salt of an organic acid;(B) from about 0.25% to about 5% by weight of a phosphorus and sulfur containing composition selected from the group consisting of(B-1) a compound represented by the formula ##STR27## wherein each X.sub.1, X.sub.2, X.sub.3 and X.sub.4 is independently oxygen or sulfur provided at least one is sulfur; each a and b is independently 0 or 1; and wherein each R.sub.1, R.sub.2 and R.sub.3 is independently hydrogen, hydrocarbyl, a group of the formula ##STR28## wherein each R.sub.4 and R.sub.5 is independently hydrogen or hydrocarbyl, provided at least one of R.sub.4 and R.sub.5 is hydrocarbyl, R.sub.6 is an alkylene or alkylidene group, each a and b is independently 0 or 1, and each X.sub.5, X.sub.6, X.sub.7 and X.sub.8 is independently oxygen or sulfur,or a group of the formula --R.sub.6 01, wherein R.sub.6 is an alkylene or alkylidene group;(B-2) an anine or an ammonium salt of (B-1) when at least R.sub.3 is hydrogen;(B-3) a compound represented by the formula ##STR29## or ##STR30## wherein each R.sub.7, R.sub.8 and R.sub.9 is independently hydrogen or a hydrocarbyl group provided at least one is hydrocarbyl and each X.sub.9, X.sub.10 and X.sub.11 is oxygen or sulfur provided at least one is sulfur; and(B-4) mixtures of two or more of (B-1) to (B-3) thereof:(C) from about 0.250,) to about 5% by weight of a hydrocarbyl phosphite; and(D) from about 0.025% to about 2% by weight of an aliphatic group substituted carboxylic acid or an anhydride thereof, wherein the aliphatic group contains at least about 12 carbon atoms,wherein the dropping point of the base grease is increased by at least about 15.degree. C. as measured by ASTM procedure D-2265.