US 5,633,415 AGranted

Dispersants and dispersant viscosity index improvers from selectively hydrogenated polymers

AssigneeMobil Oil Corporation

InventorsEllen B. Brandes, Frederick C. Loveless

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Abstract

The invention provides dispersants and dispersant viscosity index improvers which include polymers of conjugated dienes which have been hydrogenated and functionalized. The dispersant substances include compositions including a copolymer of two different conjugated dienes, a copolymer of a p-alkylstyrene and a conjugated diene, or a homopolymer of a conjugated diene. The polymers are selectively hydrogenated to produce polymers which have highly controlled amounts of unsaturation, permitting highly selective functionalization. Also provided are lubricant fluids, such as mineral and synthetic oils, which have been modified in their dispersancy and/or viscometric properties by means of the dispersant substances of the invention. Also provided are methods of modifying the dispersancy and/or viscometric properties of lubricating fluids such as mineral and synthetic lubricating oils. The dispersant substances may also include a carrier fluid to provide dispersant concentrates.

Claims54

Dependent claims

A dispersant substance for modifying the dispersancy or viscometric properties of a fluid, comprising:

a copolymer of a first conjugated diene and a second conjugated diene, wherein:
said first conjugated diene comprises at least one relatively more substituted conjugated diene having at least five carbon atoms and the formula:
##STR19## wherein R.sup.1 -R.sup.6 are each hydrogen or a hydrocarbyl group, provided that at least one of R.sup.1 -R.sup.6 is a hydrocarbyl group, provided that after polymerization, the unsaturation of the polymerized conjugated diene of formula (1) has the formula:
##STR20## wherein R.sup.I, R.sup.II, R.sup.III and R.sup.IV are each hydrogen or a hydrocarbyl group, provided that either both R.sup.I and R.sup.II are hydrocarbyl groups or both R.sup.III and R.sup.IV are hydrocarbyl groups;
and
said second conjugated diene comprises at least one relatively less substituted conjugated diene different from the first conjugated diene and having at least four carbon atoms and the formula:
##STR21## wherein R.sup.7 -R.sup.12 are each hydrogen or a hydrocarbyl group, provided that after polymerization, the unsaturation of the polymerized conjugated diene of formula (3) has the formula:
##STR22## wherein R.sup.V, R.sup.VI, R.sup.VII and R.sup.VIII are each hydrogen or a hydrocarbyl group, provided that one of R.sup.V or R.sup.VI is hydrogen, one of R.sup.VII or R.sup.VIII is hydrogen, and at least one of R.sup.V, R.sup.VI, R.sup.VII and R.sup.VIII is a hydrocarbyl group;
and
wherein said copolymer has been functionalized by a method comprising:
selectively hydrogenating said copolymer to provide a selectively hydrogenated copolymer;
and
functionalizing said selectively hydrogenated copolymer to provide a functionalized copolymer having at least one polar functional group.

10 more elements

A method of modifying the dispersancy or viscometric properties of a fluid, comprising:

admixing with a fluid an amount of a dispersant substance sufficient to provide a dispersant-modified fluid having modified dispersant or viscometric properties;
wherein said dispersant substance comprises:
a copolymer of a first conjugated diene and a second conjugated diene, wherein:
said first conjugated diene comprises at least one relatively more substituted conjugated diene having at least five carbon atoms and the formula:
##STR23## wherein R.sup.1 -R.sup.6 are each hydrogen or a hydrocarbyl group, provided that at least one of R.sup.1 -R.sup.6 is a hydrocarbyl group, provided that after polymerization, the unsaturation of the polymerized conjugated diene of formula (1) has the formula:
##STR24## wherein R.sup.I, R.sup.II, R.sup.III and R.sup.IV are each hydrogen or a hydrocarbyl group, provided that either both R.sup.I and R.sup.II are hydrocarbyl groups or both R.sup.III and R.sup.IV are hydrocarbyl groups;
and
said second conjugated diene comprises at least one relatively less substituted conjugated diene different from the first conjugated diene and having at least four carbon atoms and the formula:
##STR25## wherein R.sup.7 -R.sup.12 are each hydrogen or a hydrocarbyl group, provided that after polymerization, the unsaturation of the polymerized conjugated diene of formula (3) has the formula:
##STR26## wherein R.sup.V, R.sup.VI, R.sup.VII and R.sup.VIII are each hydrogen or a hydrocarbyl group, provided that one of R.sup.V or R.sup.VI is hydrogen, one of R.sup.VII or R.sup.VIII is hydrogen, and at least one of R.sup.V, R.sup.VI, R.sup.VII and R.sup.VIII is a hydrocarbyl group;
and
wherein said copolymer has been functionalized by a method comprising:
selectively hydrogenating said copolymer to provide a selectively hydrogenated copolymer;
and
functionalizing said selectively hydrogenated copolymer to provide a functionalized copolymer having at least one polar functional group.

12 more elements

A dispersant-modified fluid having modified dispersancy or viscometric properties comprising:

a fluid;
and
a dispersant substance comprising:
a copolymer of a first conjugated diene and a second conjugated diene, wherein:
said first conjugated diene comprises at least one relatively more substituted conjugated diene having at least five carbon atoms and the formula:
##STR27## wherein R.sup.1 -R.sup.6 are each hydrogen or a hydrocarbyl group, provided that at least one of R.sup.1 -R.sup.6 is a hydrocarbyl group, provided that after polymerization, the unsaturation of the polymerized conjugated diene of formula (1) has the formula:
##STR28## wherein R.sup.I, R.sup.II, R.sup.III and R.sup.IV are each hydrogen or a hydrocarbyl group, provided that either both R.sup.I and R.sup.II are hydrocarbyl groups or both R.sup.III and R.sup.IV are hydrocarbyl groups;
and
said second conjugated diene comprises at least one relatively less substituted conjugated diene different from the first conjugated diene and having at least four carbon atoms and the formula:
##STR29## wherein R.sup.7 -R.sup.12 are each hydrogen or a hydrocarbyl group, provided that after polymerization, the unsaturation of the polymerized conjugated diene of formula (3) has the formula:
##STR30## wherein R.sup.V, R.sup.VI, R.sup.VII and R.sup.VIII are each hydrogen or a hydrocarbyl group, provided that one of R.sup.V or R.sup.VI is hydrogen, one of R.sup.VII or R.sup.VIII is hydrogen, and at least one of R.sup.V, R.sup.VI, R.sup.VII and R.sup.VIII is a hydrocarbyl group;
and
wherein said copolymer has been functionalized by a method comprising:
selectively hydrogenating said copolymer to provide a selectively hydrogenated copolymer;
and
functionalizing said selectively hydrogenated copolymer to provide a functionalized copolymer having at least one polar functional group.

13 more elements

A dispersant substance for modifying the dispersancy or viscometric properties of a lubricant fluid, comprising:

a homopolymer of a conjugated diene, wherein:
said conjugated diene has at least five carbon atoms and the formula:
##STR31## wherein R.sup.1 -R.sup.6 are each hydrogen or a hydrocarbyl group, provided that at least one of R.sup.1 -R.sup.6 is a hydrocarbyl group, provided that after polymerization, the unsaturation of the polymerized conjugated diene of formula (1) has the formula:
##STR32## wherein R.sup.I, R.sup.II, R.sup.III and R.sup.IV are each hydrogen or a hydrocarbyl group, provided that either both R.sup.I and R.sup.II are hydrocarbyl groups or both R.sup.III and R.sup.IV are hydrocarbyl groups;
or
said conjugated diene has at least four carbon atoms and the formula:
##STR33## wherein R.sup.7 -R.sup.12 are each hydrogen or a hydrocarbyl group, provided that after polymerization, the unsaturation of the polymerized conjugated diene of formula (3) has the formula:
##STR34## wherein R.sup.V, R.sup.VI, R.sup.VII and R.sup.VIII are each hydrogen or a hydrocarbyl group, provided that one of R.sup.V or R.sup.VI is hydrogen, one of R.sup.VII or R.sup.VIII is hydrogen, and at least one of R.sup.V, R.sup.VI, R.sup.VII and R.sup.VIII is a hydrocarbyl group;
wherein said polymer has been functionalized by a method comprising:
selectively hydrogenating said polymer to provide a selectively hydrogenated polymer;
and
functionalizing said selectively hydrogenated polymer to provide a functionalized polymer having at least one polar functional group.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/488,046Filed 7 Jun 1995 · continuation in part
Priority: 16 Jan 1990
Granted: 27 May 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification40 codes

C10L 1/1955
Obtained by reactions involving only carbon-to-carbon unsaturated bonds: homo- or copolymers of compounds having one or more unsaturated aliphatic…
C07C 15/40
Cyclic hydrocarbons containing only six-membered aromatic rings as cyclic parts: substituted by unsaturated carbon radicals
C08F 8/00
Chemical modification by after-treatment
C08F 8/04
Chemical modification by after-treatment: reduction, e.g. hydrogenation

Family

Serial466,135Parent of this division · filed 16 Jan 1990
Serial907,959Parent of this continuation · filed 6 Aug 1992
Serial992,341Parent of this division · filed 17 Dec 1992
Serial179,051Parent of this division · filed 7 Jan 1994
Serial382,814Parent of this continuation-in-part · filed 3 Feb 1995
US 5,545,783 AParent of this continuation-in-part
US 5,387,730 AParent of this division
US 5,288,937 AParent of this division
US 5,210,359 AParent of this continuation
US 5,149,895 AParent of this division
US 5,633,415 AThis patent

From the US filing history. Foreign family members aren’t listed.