Lubricating oil additive, process for the synthesis thereof and lubricating oil additive composition

Claim 1

A lubricating oil additive composition comprising a reaction product obtained by I. reacting A. an alkyl- or alkenylsuccinic anhydride of the formula ##STR14## wherein R is alkyl or alkenyl having from 40 to 200 carbon atoms, with B. polyethylene glycol or polypropylene glycol of the formula HOR"' (OR"').sub.p OH wherein both R"' in the formula are the same and wherein R"' is ethylene or propylene, and p is an integer from 4 to 19 at a molar ratio of A:B in the range of 1:1 to 1:0.1, at a temperature in the range of 150° to 220° C, until the infrared absorptions for ν C ═O at 1870cm -1 and 1790cm -1 disappear, an infrared absorption for ν C ═O is present at 1750cm -1 , and an infrared absorption for ν OH is present at about 3450cm -1 , to obtain a first intermediate product, and then Ii. reacting said first intermediate product with C. a secondary alkanolamine of the formula NH(R"' OH).sub.2 wherein R"' is as defined above at a molar ratio of said first intermediate product:C in the range of 1:0.3 to 1:1, under reduced pressure, at a temperature in the range of from 150° to 200° C, until infrared absorptions are present for ν C ═O at 1750cm -1 and 1650cm -1 , an infrared absorption is present for ν OH at about 3450cm -1 and no turbidity is observed when the reaction mixture is dissolved in n-pentane and is cooled, and then Iii. reacting the product of step II with boric acid or boric acid anhydride at a molar ratio of from 0.3 to one mole of boric acid or boric acid anhydride per one mole of A, under reduced pressure, at a temperature of 100° to 200° C until the infrared absorption for ν OH at about 3450cm -1 disappears and no turbidity or precipitate appears when the reaction mixture is dissolved in n-pentane and is cooled.