C - Chemistry – Metallurgy – 10 – M
Patent
C - Chemistry, Metallurgy
10
M
C10M 159/20 (2006.01)
Patent
CA 2730058
Disclosed are antiwear hydraulic fluid compositions comprising (a) a major amount of a base oil of lubricating viscosity and (b) a minor amount of at least one oil soluble detergent additive comprising a salt of an alkyl-substituted hydroxybenzoic acid or a sulfurized derivative thereof, wherein said salt is selected from the group consisting of alkali metal salts, alkaline earth metal salts, ammonium salts or substituted ammonium salts, and further wherein said antiwear hydraulic fluid compositions have a Carboxylate Index of greater than levels disclosed herein.
L'invention porte sur des compositions de fluides hydrauliques anti-usures comprenant (a) une quantité majeure d'une huile de base de viscosité lubrifiante et (b) une quantité mineure d'au moins un additif détergent soluble dans l'huile, comprenant un sel d'un acide hydroxybenzoïque substitué par alkyle ou un dérivé sulfuré de celui-ci, ledit sel étant choisi dans le groupe constitué par les sels de métaux alcalins, les sels de métaux alcalino-terreux, les sels d'ammonium ou les sels d'ammonium substitués, et lesdites compositions de fluide hydraulique anti-usure ayant un indice de carboxylate supérieur aux niveaux décrits présentement.
Denieulle Nicolas
Frazier Rawls H. Jr.
Hamel Patrice
Chevron Oronite S.a.
Sim & Mcburney
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