| 摘要 |
AN ESTER RESULTING FROM AN ESTERIFICATION REACTION BETWEEN AT LEAST ONE POLYFUNCTIONAL ALCOHOL AND AT LEAST ONE POLYFUNCTIONAL CARBOXYLIC ACID USING A CHAIN STOPPING AGENT TO FORM ESTER BONDS WITH THE REMAINING HYDROXYL OR CARBOXYL GROUPS IS DISCLOSED. THE POLYFUNCTIONAL CARBOXYLIC ACID COMPRISES AN ALIPHATIC DICARBOXY1IC ACID CONTAINING FROM 9 TO 18 CARBON ATOMS, DIMERISED AND/OR TRIMERISED FATTY ACIDS OR MIXTURES THEREOF, WITH THE PROVISO THAT DIMERISED AND TRIMERISED FATTY ACIDS DO NOT CONSTITUTE MORE THAN 80% BY WEIGHT OF THE TOTAL AMOUNT OF POLY FUNCTIONAL CARBOXYLIC ACID USED. THE CHAIN STOPPING AGENT MAY BE A MONOCARBOXYLIC ACID OR A MONOFUNCTIONAL ALCOHOL HAVING AT LEAST 14 CARBON ATOMS. THE COMPLEX ESTERS HAVE A KINEMATIC VISCOSITY AT 100 C OF FROM 30 TO 1000 MM2/S (CST), PREFERABLY FROM 30 TO 200 MM 2/S (CST). THE COMPLEX ESTER IS USEFUL ''AS IS" OR AS AN ADDITIVE AND/OR AS A BASE FLUID AND/OR A THICKENER IN TRANSMISSION OILS, HYDRAULIC FLUIDS, FOUR-STROKE OILS, FUEL ADDITIVES, COMPRESSOR OILS, GREASES, CHAIN OILS AND FOR METAL WORKING METAL ROLLING APPLICATIONS A MULTIGRADE GEAR OIL FORMULATION COMPRISING ONE OR MORE OF THE ABOVE COMPLEX ESTERS IS ALSO PART OF THE INVENTION.
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