| abstract |
A lubricant additive consists of (a) trialkyl-Pb-cyanamide or trialkyl-Pb-cyanoguanidine, the alkyl gp. having 1-12C, (b) where X = N, CH or CR', Y = CH, CO, CR or N if X = CH or CR', R = alkyl with 1-12C, R' = phenyl and alkyl with 1-20C, R" = H, NH2, NHR"', alkyl with 1-4C or phenyl R" = phenyl and alkyl with 1-20C and O = phenyl, with provic. that at least one of the following is true: R" is NH2 or X = CR', R' being O, Y = CR and R" = NHR"', (c) and in each case total of C atoms in R and R' is at least 8. |