Multigrade lubricating compositions

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 161/00 (2006.01) C10M 129/10 (2006.01) C10M 135/02 (2006.01) C10M 135/10 (2006.01) C10M 141/08 (2006.01) C10M 143/00 (2006.01) C10M 163/00 (2006.01) C10M 169/04 (2006.01)

Patent

CA 2194906

Multigrade lubricating oils which have acceptable performance in the VWInTD and Sequence VE engine tests and which are based on an ashless dispersant comprising an oil-soluble polymeric backbone having functional groups in which the hydrocarbon backbone is derived from an ethylene alpha-olefin (EAO) copolymer or alpha-olefin homo- or copolymer having greater than 30 % of terminal vinylidene unsaturation achieve this performance by use of a detergent combination which includes a phenate in the formulation of the oils.

L'invention concerne des huiles lubrifiantes multigrades qui présentent des performances acceptables lors des essais moteur de la Séquence VE et de Volkswagen sur les moteurs turbodiésel à refroidissement intermédiaire, et qui sont à base d'un dispersant sans cendre comprenant un squelette polymère soluble dans l'huile et possédant des groupes fonctionnels dans lesquels le squelette hydrocarbure est dérivé d'un copolymère d'éthylène alpha-oléfine ou d'un homo- ou copolymère d'alpha-oléfine ayant une insaturation terminale vinylidène supérieure à 30 %. Ces performances sont obtenues à l'aide d'une association de détergents, comportant un phénate dans la formulation des huiles.

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