Automatic transmission fluid compositions with improved...

C - Chemistry – Metallurgy – 10 – M

Patent

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C10M 169/04 (2006.01)

Patent

CA 2294938

This invention provides a composition and method for producing partial synthetic automatic transmission fluid composition having improved shear stability and low temperature properties whereby the automatic transmission fluid composition beside a natural lubricating oil, a synthetic lubricating oil, a seal swelling agent and a friction modifier also contains a specific amount of a flow improver which is a selected polymer with a specific weight average molecular weight and which composition is devoid of polymeric high molecular weight viscosity modifiers.

La présente invention concerne une composition et un procédé permettant de produire une composition de fluide pour transmissions automatiques partiellement synthétique présentant des propriétés améliorées de stabilité au cisaillement et de basse température, ladite composition de fluide pour transmissions automatiques comprenant, outre une huile lubrifiante naturelle, une huile lubrifiante synthétique, un agent gonflant d'étanchéité et un agent modificateur de friction, une quantité spécifique d'un agent améliorant l'écoulement composé d'un polymère choisi d'une masse moléculaire moyenne en poids spécifique dont la composition ne comprend pas de régulateurs de viscosité polymériques à poids moléculaire élevé.

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