LUBRICANTS, FUNCTIONAL FLUID AND GREASE COMPOSITIONS CONTAINING SULFITE OR SULFATE OVERBASED METAL SALTS AND METHODS OF USING THE SAME

摘要

Title: LUBRICATING COMPOSITIONS, GREASES AND FUNCTIONAL FLUIDS CONTAINING SULFITE OR SULFATE OVERBASED SALTS The invention includes a lubricating composition comprising a major amount of an oil of lubricating viscosity, and a minor amount of (A) a sulfite or sulfate overbased or borated overbased metal salt of an acidic organic compound, whereinthe lubricating composition contains less than 1.5 % by weight of an ashless dispersant which is the reaction product of a polyisobutene substituted succinic anhydride and a polyamine, and provided that when (A) is a sulfate overbased or borated overbased metal salt, then the lubricating composition includes (B) at least one phosphorous of boron antiwear/extreme pressure agent, or (C) a sulfur compound. The invention also includes grease and functional fluids containing the sulfite and sulfate overbased metal salts. These composition have improved antiwear, antiweld, and extreme pressure properties.