Viscosity index improver for lubricant compositions

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 143/00 (2006.01) C08F 2/38 (2006.01) C08F 295/00 (2006.01) C08F 297/08 (2006.01)

Patent

CA 2601369

A lubricant composition comprises a base oil and a viscosity modifier including an ethylene/.alpha.-olefm interpolymer. The ethylene/.alpha.-olefm interpolymer is a block copolymer having at least a hard block and at least a soft block. The soft block comprises a higher amount of comonomers than the hard block. The block copolymer has a number of unique characteristics disclosed here. Such block copolymers offer the possibility of improved low temperature performance and flexibility in formulating motor oil, gear lubricants and greases, etc.

L'invention porte sur une composition lubrifiante contenant une huile de base et un modificateur de viscosité contenant un interpolymère d'éthylène/.alpha.-olefm. Cet interpolymère d'éthylène/.alpha.-olefm consiste en un copolymère de bloc présentant un bloc dur et au moins un bloc mou. Le bloc dur comprend une quantité supérieure de comonomères par rapport au bloc dur. Le copolymère de bloc possède un certain nombre de caractéristiques uniques. Ces colpolymères de bloc présentent une meilleure performance à faible température et une meilleure flexibilité dans la formulation d'huiles pour moteur, de lubrifiants d'engrenages et de graisses, etc.

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