| 摘要 |
The alkali metal and alkaline-earth-metal salts are disclosed of a monoester of a bicarboxy acid having the formula: <IMG> wherein R is alkyl, R1 is either hydrogen or alkyl, R2 is alkyl and A is a single bond or alkylene, said alkyl containing each respectively from 1 to 30 carbon atoms, and said "alkylene" meaning an alkylene radical containing from 1 to 30 carbon atoms with the proviso that: a) the sum of carbon atoms contained in R, A, R1 and R2 radicals is equal to, or greater than 15; and b) when A is a single bond, the sum of carbon atoms contained in R1 and R2 is less than 50; and the corresponding hyperbasic derivatives, useful as detergent additives for lubricants. Also the lubricating compositions containing such additives are disclosed.
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