Multifunctional viscosity index improver

Details Multifunctional viscosity index improver Multifunctional viscosity index improver

C - Chemistry, Metallurgy

08

L

253/128, 400/307

C08L 33/02 (2006.01) C08L 51/06 (2006.01) C08L 51/08 (2006.01) C10M 119/02 (2006.01) C10M 143/02 (2006.01) C10M 145/10 (2006.01) C10M 149/06 (2006.01)

Patent

CA 2001656

ABSTRACT OF THE DISCLOSURE Oleaginous compositions, particularly lubricating oil compositions, exhibiting improved low temperature viscometric properties containing a viscosity index improving effective amount of a multifunctional viscosity index improver comprised of the reaction products of: (a) an oil soluble ethylene copolymer comprising from about 15 to 90 wt. % ethylene and from about 10 to 85 wt. % of at least one C3 to C28 alpha-olefin, having a number average molecular weight of from about 5,000 to 500,000, grafted with an ethylenically unsaturated carboxylic acid material having 1 or 2 acid or anhydride moieties; (b) an organic polyamine having at least two reactive amino groups selected from primary and secondary amine groups, or a polyol; and (c) poly-n-butene substituted dicarboxylic acid material, wherein said poly-n-butene has a number average molecular weight of from about 300 to about 3,000.

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