Engine oil composition with reduced deposit-formation tendency

Details Engine oil composition with reduced deposit-formation tendency Engine oil composition with reduced deposit-formation tendency

C - Chemistry, Metallurgy

10

M

C10M 145/36 (2006.01) C10M 133/08 (2006.01) C10M 133/16 (2006.01) C10M 145/24 (2006.01) C10M 145/38 (2006.01)

Patent

CA 2372458

The invention relates to engine oil compositions with reduced deposit- formation tendency which contain between 0.05 and 10 % by weight, in relation to the total weight of the engine oil composition, of an alkyl alkoxylate of formula (I), in which R1, R2 and R3 independently are hydrogen or a hydrocarbon rest with up to 40 carbon atoms; R4 is hydrogen, a methyl or ethyl rest; L is a linking group; n is a whole number between 4 and 40; A is an alkoxy group with between 2 and 25 recurring units derived from ethylene oxide, propylene oxide and/or butylene oxide and comprises homopolymers and statistical copolymers of at least two of the above compounds; and z is 1 or 2. The nonpolar part of compound (I) of the formula (II) contains at least 9 carbon atoms. The invention also relates to the preparation of such engine oils and to the use of alkyl alkoxylates of formula (I) for the reduction of deposit formation.

L'invention concerne des compositions d'huile de moteur à tendance réduite à la formation de dépôts, qui contiennent entre 0,05 et 10 % en poids, par rapport au poids global de la composition d'huile de moteur, d'un alcoxylate d'alkyle de la formule (I) dans laquelle R<1>, R<2> et R<3> désignent indépendamment les uns des autres, hydrogène ou un reste hydrocarbure ayant jusqu'à 40 atomes de carbone, R<4> désigne hydrogène, un reste méthyle ou éthyle, L désigne un groupe combinant, n vaut un nombre entier compris entre 4 et 40, A est un groupe alcoxy ayant entre 2 et 25 unités récurrentes dérivées de l'oxyde d'éthylène, de l'oxyde de propylène et/ou de l'oxyde de butylène, A comprenant des homopolymères et des copolymères statistiques issus d'au moins deux des composés précités, et z vaut 1 ou 2, la part non polaire du composé (I) de la formule (II) contenant au moins 9 atomes de carbone. L'invention concerne en outre le mode de production de ces huiles de moteur, ainsi que l'utilisation d'alcoxylates d'alkyle de la formule (I) pour réduire la formation de dépôts.

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