Copper salts of succinic anhydride derivatives

Abstract From the Canadian patent

Abstract, Lubricant antioxidant composition comprising a copper salt of a substituted succinic anhydride derivative containing a succinic anhydride derivative group which is, , or, - 33 -, Each R may be independently hydrogen or a hydrocarbonbased group containing up to about 18 carbon atoms. At least one R is hydrogen. R1 is a lower alkyl radical. Each R1 is independently hydrogen or a hydrocarbonbased group containing up to 27 carbon atoms. The substituted succinic anhydride derivative contains a substituent group which is a hydrocarbon-based group. The total number of carbon atoms in said substituent group and said R' groups is no more than 35.