Trimethylolpropane esters useful as base lubricants for motor oils
AssigneesInstitut Francais du Petrole, Rhone-Progil
InventorsGerard Leleu, Pierre Bedague, Bernard Sillion
Life of this patent
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Abstract
A trimethylolpropane ester composition useful as lubricant base for motor-car engines is prepared by total esterification of trimethylolpropane by means of a mixture of saturated aliphatic carboxylic acids comprising 6-33% by mole of dicarboxylic acids having 4-19 carbon atoms and 94-67 % by mole of monocarboxylic acids whereof 5-90% consists of sparingly branched acids comprising 15-30 carbon atoms and 95-10% of straight chain acids comprising 2-30 carbon atoms.
Claims25
A trimethylol-propane ester composition useful as lubricant base for motor-car engines, consisting essentially of the product obtained by total esterification of trimethylolpropane by means of a diversity of saturated aliphatic-hydrocarbyl carboxylic acids, said diversity having in a proportion of 6 to 33% of the carboxy equivalents, at least one straight or branched-chain dicarboxylic acid having from 4 to 19 carbon atoms, and in a proportion of 94 to 67% of the carboxy equivalents, a mixture of monocarboxylic acids, wherein said mixture of monocarboxylic acids comprises:
- a. from 10 to 70% by mole of at least one branched chain acid having from 15 to 22 carbon atoms and selected from the group consisting of those having one methyl side chain, those having two methyl side chains, those having one ethyl side chain, those having one methyl and one ethyl side chains, and those having two ethyl side chains, and
- b. from 90 to 30% by mole of at least one straight chain acid having from 7 to 22 carbon atoms.
A composition according to chain 1, wherein the branched chain acid is isostearic acid.
A trimethylol-propane ester composition useful as lubricant base for motor-car engines, consisting essentially of the product obtained by total esterification of trimethylolpropane by means of a diversity of saturated aliphatic-hydrocarbyl carboxylic acids, said diversity having in a proportion of 6 to 33% of the carboxy equivalents, at least one straight or branched-chain dicarboxylic acid having from 4 to 19 carbon atoms, and in a proportion of 94 to 67% of the carboxy equivalents, a mixture of monocarboxylic acids, said mixture comprising:
- a. from 10 to 30% by mole of a branched chain acid containing 15-22 carbon atoms and selected from the group consisting of those having one methyl side chain, those having two methyl side chains, those having one ethyl side chain, those having one methyl and one ethyl side chains, and those having two ethyl side chains, and
- b. from 40 to 60% by mole of straight-chain acid containing 7 to 9 carbon atoms and from 20 to 40% by mole of straight chain acid containing 10 to 16 carbon atoms.
Dependencies are inferred from the claim text.