US 6,215,033 B1Granted

Dispersants and dispersant viscosity index improvers from selectively hydrogenated polymers: blends with lower molecular weight components

AssigneeMobil Oil Corporation

InventorsThomas S. Coolbaugh, John M. Klosek, Frederick C. Loveless, John E. Marlin, II, Demetreos N. Matthews

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Abstract

The invention provides dispersants and dispersant viscosity index improvers which include polymers of conjugated dienes which have been hydrogenated, functionalized, optionally modified, and post treated. The dispersant substances include a copolymer of two different conjugated dienes. The polymers are selectively hydrogenated to produce polymers which have highly controlled amounts of unsaturation, permitting highly selective functionalization. The polymers may be blended with lower molecular weight components. 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.

Claims35

Dependent claims

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

(a) a first component having a molecular weight above 3,000 which 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:
wherein R1-R6 are each hydrogen or a hydrocarbyl group, provided that at least one of R1-R6 is a hydrocarbyl group, provided that after polymerization, the unsaturation of the polymerized conjugated diene of formula (1) has the formula:
wherein RI, RII, RIII and RIV are each hydrogen or a hydrocarbyl group, provided that either both RI and RII are hydrocarbyl groups or both RIII and RIV 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:
wherein R7-R12 are each hydrogen or a hydrocarbyl group, provided that after polymerization, the unsaturation of the polymerized conjugated diene of formula (3) has the formula:
wherein RV, RVI, RVII and RVIII are each hydrogen or a hydrocarbyl group, provided that one of RV or RVI is hydrogen, one of RVII or RVIII is hydrogen, and at least one of RV, RVI, RVII and RVIII 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;
and
(b) a second polymeric component having a molecular weight in the range of from about 150 to about 3,000.

12 more elements

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

a fluid;
and
a dispersant substance comprising;
(a) a first component having a molecular weight above 3,000 which comprises a copolymer of a first conjugated diene and a second conjugated diene and having a molecular weight above 3,000, wherein:
said first conjugated diene comprises at least one relatively more substituted conjugated diene having at least five carbon atoms and the formula:
wherein R1-R6 are each hydrogen or a hydrocarbyl group, provided that at least one of R1-R6 is a hydrocarbyl group, provided that after polymerization, the unsaturation of the polymerized conjugated diene of formula (1) has the formula:
wherein RI, RII, RIII and RIV are each hydrogen or a hydrocarbyl group, provided that either both RI and RII are hydrocarbyl groups or both RIII and RIV 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:
wherein R7-R12 are each hydrogen or a hydrocarbyl group, provided that after polymerization, the unsaturation of the polymerized conjugated diene of formula (3) has the formula:
wherein RV, RVI, RVII and RVIII are each hydrogen or a hydrocarbyl group, provided that one of RV or RVI is hydrogen, one of RVII or RVIII is hydrogen, and at least one of RV, RVI, RVII and RVIII 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;
(b) a second polymeric component having a molecular weight in the range of from about 150 to about 3,000.

14 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/209,901Filed 11 Dec 1998
Granted: 10 Apr 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification56 codes

C10L 1/143
Organic compounds: mixtures of organic macromolecular compounds with organic non-macromolecular compounds
C10M 129/86
Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen: having a carbon chain of 30…
C10M 129/90
Hydroxy compounds: having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
C10M 129/92
Having a carbon chain of 30 or more atoms: carboxylic acids