Complex esters, formulations comprising these esters and use...

C - Chemistry – Metallurgy – 10 – M

Patent

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C10M 105/42 (2006.01) C07C 69/34 (2006.01) C07C 69/50 (2006.01) C07C 69/593 (2006.01) C07C 69/604 (2006.01) C10L 1/18 (2006.01) C10M 119/16 (2006.01) C10M 129/78 (2006.01) C10M 169/04 (2006.01) C10M 171/00 (2006.01)

Patent

CA 2304509

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 dicarboxylic 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 polyfunctional 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 cSt, preferably from 30 to 200 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.

L'invention concerne un ester obtenu par une réaction d'estérification entre au moins un alcool polyfonctionnel et au moins un acide carboxylique polyfonctionnel, en utilisant un agent d'arrêt de chaîne pour former des liaisons d'ester avec les groupes hydroxyle ou carboxyle restants. L'acide carboxylique polyfonctionnel comprend un acide dicarboxylique aliphatique contenant entre 9 et 18 atomes de carbone, des acides gras dimérisés et/ou trimérisés ou des mélanges de ces derniers, à condition que ces acides gras dimérisés et trimérisés ne constituent pas plus de 80 % en poids de la quantité totale d'acide carboxylique polyfonctionnel utilisé. L'agent d'arrêt de chaîne peut être un acide monocarboxylique ou un alcool monofonctionnel comportant au moins 14 atomes de carbone. Les esters complexes présentent une viscosité cinématique à 100 DEG C comprise entre 30 et 1000 cSt; de préférence, 30 et 200 cSt. L'ester complexe est utile tel quel ou comme additif et/ou fluide de base et/ou agent épaississant dans les huiles de transmission, les fluides hydrauliques, les huiles pour quatre temps, les additifs de carburant, les huiles de compresseurs, les graisses, les huiles de chaînes, et les applications pour laminoirs à métaux. L'invention concerne aussi une formulation d'huile multigrade comprenant un ou plusieurs des esters complexes susmentionnés.

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