Lubricating oil additive, process for the synthesis thereof and lubricating oil additive composition
AssigneeToa Nenryo Kogyo Kabushiki Kaisha
InventorNobukazu Okamoto
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Abstract
The invention comprises an ashless additive (I) of the formula: ##STR1## in which Z is oxygen or nitrogen. R is alkyl or alkenyl of more than 40 carbon atoms, inclusive, R' is --(R"'OH).sub.2 when Z is nitrogen or (R"'O).sub.m H when Z is oxygen, R" is --R"'NH(R"'OH) or --(R"'0).sub.m H or mixtures thereof, R"' is an alkylene group of 2-3 carbon atoms, m is 5 to 20; Or (II) the corresponding boric acid esters; Or (III) the corresponding boric acid ester of the reaction product of polyalkenylsuccinic anhydride and a N,N,N'-tris (polyoxyalkylene) alkylalkylenediamine; For use in lubricating oils, to methods for preparing the additives, and to lubricating compositions containing the additives.
Claims1
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.degree. to 220.degree. C, until the infrared absorptions for .nu..sub.C.dbd.O at 1870cm.sup.-1 and 1790cm.sup.-1 disappear, an infrared absorption for .nu..sub.C.dbd.O is present at 1750cm.sup.-1, and an infrared absorption for .nu..sub.OH is present at about 3450cm.sup.-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.degree. to 200.degree. C, until infrared absorptions are present for .nu..sub.C.dbd.O at 1750cm.sup.-1 and 1650cm.sup.-1, an infrared absorption is present for .nu..sub.OH at about 3450cm.sup.-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.degree. to 200.degree. C until the infrared absorption for .nu..sub.OH at about 3450cm.sup.-1 disappears and no turbidity or precipitate appears when the reaction mixture is dissolved in n-pentane and is cooled.
Dependencies are inferred from the claim text.