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US 5,068,047 AGranted
Visosity index improver
AssigneeExxon Chemical Patents Inc.
InventorsDavid Y. Chung, Mark J. Struglinski
Life of this patent
Estimating the term…
Abstract
Degraded molecular weight copolymers of ethylene alpha-olefin are provided. The ethylene alpha-olefin copolymers, before degradation, are characterized by having a narrow molecular weight distribution and are comprised of intramolecularly heterogeneous and intermolecularly homogeneous copolymer chains. The degraded copolymers are useful as viscosity index improvers for oils.
Claims154
Composition of matter useful as multifunctional viscosity index improver additive for oleaginous composition comprising reaction product:
- (i) (a) molecular weight degraded ethylene-.alpha.-olefin copolymer obtained by degrading undegraded copolymer of ethylene and at least one other .alpha.-olefin monomer, said undegraded copolymer comprising intramolecularly heterogeneous copolymer chains containing at least one crystallizable segment of methylene units and at least one low crystallinity ethene-.alpha.-olefin copolymer segment, wherein and said at least one crystallizable segment comprises at least about 10 weight percent of said copolymer chain and contains at least about 57 weight percent ethylene, wherein said low crystallinity segment contains not greater than about 53 weight percent ethylene, and 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 wherein at least two portions of individual intramolecularly heterogeneous chain, each portion comprising at least 5 weight percent of said chain, differ in composition from one another by at least 7 weight percent ethylene;
- said degraded ethylene-.alpha.-olefin copolymer grafted with (b) ethylenically monounsaturated carboxylic acid material having 1 to 2 carboxylic acid groups or anhydride group to form grafted degraded ethylene-.alpha.-olefin copolymer;
- and
- (ii) at least one of
- (a) polyamine having at least two reactive amino groups selected from primary amino groups, secondary amino groups and
- (b) polyol,
- (c) about C.sub.50 to about C.sub.400 hydrocarbyl substituted carboxylic acid component containing 1 to 2 carboxylic acid groups or anhydride group, and polyol, and
- (d) polyamine having at least two reactive amino groups selected from primary amino groups, secondary amino groups and mixtures thereof, and about C.sub.50 to about C.sub.400 hydrocarbyl substituted carboxylic acid component containing 1 to 2 carboxylic acid groups or anhydride groups.
5 more elements
A lubricant composition exhibiting improved low temperature viscometric properties and dispersancy comprising:
- (1) oleaginous material and
- (2) multifunctional viscosity index improver comprised of reaction product of
- (i) (a) molecular weight degrade ethylene-.alpha.-olefin copolymer obtained by degrading undegraded copolymer of ethylene and at least one other .alpha.-olefin monomer, said undegraded 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 at least one crystallizable segment comprises at least about 10 weight percent of said copolymer chain and contains at least about 5 weight percent ethylene, wherein said low crystallinity segment contains not greater than about 53 weight percent ethylene, and 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 wherein at least two portions of an individual intramolecularly heterogeneous chain, each portion comprising at least 5 weight percent of said chain, differ in composition from one another by at least 7 weight percent ethylene, said degraded ethylene-.alpha.-olefin copolymer grafted with (b) ethylenically monounsaturated carboxylic acid material having 1 to 2 carboxylic acid groups or anhydride group to form grafted degraded ethylene copolymer;
- and
- (ii) at least one of
- (a) polyamine having at least two reactive amino groups selected from primary amino groups, secondary amino groups and mixtures thereof,
- (b) polyol,
- (c) about C.sub.50 to about C.sub.400 hydrocarbyl substituted carboxylic acid component containing 1 to 2 carboxylic acid groups or anhydride group, and polyol, and
- (d) polyamine containing at least two reactive amino groups selected from primary amino groups, secondary amino groups and mixtures thereof, and about C.sub.50 to about C.sub.400 hydrocarbyl substituted carboxylic acid component containing 1 to 2 carboxylic acid groups or anhydride group.
6 more elements
Dependencies are inferred from the claim text.