Lubricating oil composition with good frictional properties

Details Lubricating oil composition with good frictional properties Lubricating oil composition with good frictional properties

C - Chemistry, Metallurgy

10

M

C10M 145/14 (2006.01) C08F 293/00 (2006.01) C10M 149/06 (2006.01) C10M 151/02 (2006.01) C10M 177/00 (2006.01)

Patent

CA 2519555

The invention relates to a lubricating oil composition with good frictional properties, said composition comprising a lubricating oil and at least one additive having friction-reducing properties. Said composition is characterised in that the additive with friction-reducing properties is a block copolymer comprising hydrophobic segments P and polar segments D. Said hydrophobic segments are obtained by polymerisation of monomer compositions comprising a) between 0 and 40 wt. %, in relation to the weight of the monomer compositions for producing the hydrophobic segments, of at least one ethylenically unsaturated ester compound of formula (I) wherein R represents hydrogen or methyl, R1 represents a linear or branched alkyl radical comprising between 1 and 5 carbon atoms, and R2 and R3 independently represent hydrogen or a group of formula -COOR' wherein R' represents hydrogen or an alkyl group containing between 1 and 5 carbon atoms.

L'invention concerne une composition d'huile lubrifiante présentant de bonnes propriétés de frottement, qui comprend une huile lubrifiante, ainsi qu'au moins un additif présentant des propriétés diminuant le frottement. Ladite composition se caractérise en ce que l'additif aux propriétés diminuant le frottement est un polymère greffé, qui comprend des segments hydrophobes P et des segments polaires D. Les segments hydrophobes sont obtenus par polymérisation de compositions de monomères comprenant : a) entre 0 et 40 % en poids, par rapport au poids des compositions de monomères pour produire les segments hydrophobes, d'un ou de plusieurs composés ester insaturés par voie éthylénique de formule (I), dans laquelle R désigne hydrogène ou méthyle, R?1¿ désigne un reste alkyle linéaire ou ramifié ayant entre 1 et 5 atomes de carbone, R?2¿ et R?3¿ désignent indépendamment hydrogène ou un groupe de formule COOR', R' désignant hydrogène ou un groupe alkyle ayant entre 1 et 5 atomes de carbone.

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