Use of surfactants with high molecular weight as...

Details Use of surfactants with high molecular weight as... Use of surfactants with high molecular weight as...

C - Chemistry, Metallurgy

10

M

C10M 129/95 (2006.01) C10M 133/56 (2006.01) C10M 145/00 (2006.01) C10M 149/00 (2006.01)

Patent

CA 2257800

The invention concerns a lubricating fluid comprising: 1) a predominant amount of oil with appropriate lubricating viscosity; and 2) between 0.03 % and 0.06 % of a filterability-enhancing agent corresponding to the following formula: R-Z in which Z represents: (i) a succinic ester acid comprising the reaction product of succinic anhydride and an aliphatic polyhydric alcohol; or (ii) a succinimide comprising the reaction product of succinic anhydride and a polyamine, said reaction product being subjected to a postcure with a cyclic carbonate, boric acid or a boric acid derivative; and R represents a polyolefin having a molecular weight (Mn) of 500 to 2500 and a Mw/Mn ratio of 1 to 5. This fluid is particularly suitable for hydraulic systems and has improved filterability characteristics.

L'invention concerne un fluide lubrifiant comprenant: 1) une quantité dominante d'une huile de viscosité propre à la lubrification; et 2) de 0,03 % à 0,06 % d'un agent améliorant la filtrabilité, répondant à la formule suivante : R-Z dans laquelle Z représente: i) un ester d'acide succinique comprenant le produit de réaction d'anhydride succinique et d'un alcool polyhydroxylique aliphatique; ou ii) un succinimide comprenant le produit de réaction d'anhydride succinique et d'une polyamine, ledit produit de réaction étant soumis à un post-traitement avec un carbonate cyclique, l'acide borique ou un dérivé d'acide borique; et R représente une polyoléfine ayant un poids moléculaire (Mn) de 500 à 2500 et un rapport Mw/Mn de 1 à 5. Ce fluide lubrifiant convient particulièrement à des systèmes hydrauliques et présente des caractéristiques de filtrabilité améliorées.

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