Power steering fluid

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 171/02 (2006.01)

Patent

CA 2691268

Provided are power steering fluids made from a waxy feed and with improved low temperature properties, such as, for example, a viscosity index of greater than 290 and a Brookfield Viscosity at -40°C of less than 1900 mPa s. In an embodiment, the power steering fluid comprises greater than 50 weight % base oil, viscosity index improver, and less than about 1.0 weight % pour point depressant.

L'invention concerne des liquides de direction assistée fabriqués à partir d'une alimentation cireuse et ayant des propriétés à basse température améliorées, telles que, par exemple, un indice de viscosité supérieur à 290 et une viscosité de Brookfield à -40 °C inférieure à 190 mPa.s. Dans un mode de réalisation, le liquide de direction assistée comprend plus de 50 % en poids d'une huile de base, un améliorateur de l'indice de viscosité, et moins d'environ 1,0 % en poids d'un abaisseur du point d'écoulement.

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