Multifunctional viscosity index improver derived from amido-amin

Details Multifunctional viscosity index improver derived from amido-amin Multifunctional viscosity index improver derived from amido-amin

1993-12-08

1994-09-20

Howard, Jacqueline V.

Compositions

Electrolytes for electrical devices

252 475, 252 515A, 585 10, 585 12, 525300, 525301, C10M14906

Patent

active

053486730

ABSTRACT:
Composition of matter useful as multifunctional viscosity index improver for lubricating oil comprising reaction product of: (i) (a) molecular weight degraded ethylene-alpha-olefin copolymer obtained by degrading copolymer of ethylene and at least one other alpha-olefin monomer, said copolymer comprising intramolecularly heterogeneous copolymer chains containing at least one crystallizable segment of methylene units and at least one low crystallinity ethylene-alpha-olefin copolymer segment, wherein said copolymer has a molecular weight distribution characterized by at least one of a ratio of M.sub.w /M.sub.n of less than 2 and a ratio of M.sub.z /M.sub.w of less than 1.8, and said degraded copolymer grafted with (b) ethylenically monounsaturated carboxylic acid material having 1 to 2 carboxylic acid groups or anhydride group to form grafted ethylene copolymer; (ii) about C.sub.50 to about C.sub.400 hydrocarbyl substituted carboxylic acid component containing 1 to 2 carboxylic acid groups or anhydride group; (iii) thioamido-amine; and (iv) C.sub.12 to about C.sub.18 hydrocarbyl substituted dicarboxylic anhydride.

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