Synergistic combination of additive providing high load...

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 169/04 (2006.01) C10M 105/38 (2006.01) C10M 133/44 (2006.01) C10M 137/10 (2006.01)

Patent

CA 2491916

The present invention relates to a lubricant composition exhibiting enhanced load-carrying capacity and oxidative/corrosion stability. The lubricant composition of the present invention comprises a major portion of an aliphatic ester base oil having lubrication properties and formed by the reaction of pentaerythritol and an organic carboxylic acid. The lubricant composition further comprises 3-(di-isobutoxythiophosphonylsulfanyl)-2-methyl-propionic acid (DITMPA) as an additive comprising from about 0.01 to about 0.40 weight percent of the fully formulated lubricating oil composition as well as yellow metal passivator comprising from about 0.01 to about 0.40 weight percent of the fully formulated lubricating oil composition. The enhanced load-carrying capacity and oxidative/corrosion stability of lubricant compositions containing DITMPA and yellow metal passivator is achieved without deleteriously affecting other salient properties of the lubricant.

L'invention concerne une composition lubrifiante présentant une capacité de charge améliorée et une résistance à la corrosion et à l'oxydation améliorée. La composition lubrifiante décrite dans cette invention est constituée, en grande partie, d'une huile de base d'ester aliphatique dotée de propriétés lubrifiantes et formée par réaction de pentaérythritol avec un acide carboxylique organique. Cette composition lubrifiante comprend 3-(di-isobutoxythiophosphonylsulfanyl)-2-méthyl-acide propionique (DITMPA) en tant qu'additif comprenant de 0,01 environ à 0,40 environ en pourcentage massique de la composition d'huile lubrifiante entièrement formulée ainsi qu'un agent passivant des métaux jaunes comprenant de 0,01 environ à 0,40 environ en pourcentage massique de la composition d'huile lubrifiante entièrement formulée. La capacité de charge améliorée et la résistance à la corrosion et à l'oxydation des compositions lubrifiantes contenant du DITMPA et un agent passivant des métaux jaunes peuvent être obtenues sans modifier de manière néfaste des propriétés importantes du lubrifiant.

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