Method for improving low-temperature fluidity of lubricating...

C - Chemistry – Metallurgy – 10 – M

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C10M 157/00 (2006.01) C10M 145/14 (2006.01)

Patent

CA 2300408

A method for improving the low temperature fluidity of lubricating oil compositions based on addition to lubricating oils of a mixture of selected high molecular weight and low molecular weight alkyl (meth)acrylate copolymers is disclosed. Combinations of low molecular weight alkyl (meth)acrylate polymers containing zero to 25 weight percent (C16- C24)alkyl (meth)acrylate with high molecular weight alkyl I (meth)acrylate polymers containing 25 to 70 weight percent (C16-C24)alkyl (meth)acrylate are especially effective at satisfying simultaneously different aspects of low temperature fluidity properties i.e. low-shear viscosity, yield stress and gel index broad range of base oils.

Le procédé de cette invention permet d'améliorer la fluidité à basse température de compositions d'huiles de graissages. En l'occurrence, on ajoute à ces huiles de graissage un mélange de copolymères d'alkyl-(méth)acrylates sélectionnés de faible masse moléculaire et de masse moléculaire élevée. A cet effet, on prend d'une part des copolymères d'alkyl-(méth)acrylates de faible masse moléculaire à 0% à 25% en masse de (C16-C24)alkyl-(méth)acrylate. On prend d'autre part des copolymères d'alkyl-(méth)acrylates de masse moléculaire élevée à 25% à 70% en masse de (C16-C24)alkyl-(méth)acrylate et on les combine. Ces combinaisons de copolymères permettent tout particulièrement de répondre à plusieurs exigences en matière de fluidité à basse température dans le cas d'une gamme étendue d'huiles de base.

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