The Lubrizol Corporation

David Price

Patrick E Mosier

David J Moreton

William R S Barton

John Kent Pudelski

James H Bush

Virginia A Carrick

Mark C Davies

Barton J Schober

Michael R Sutton

Marina Baum

Daniel C Visger

Mark F Wilkes

James N Vinci

Jonathan S Vilardo

Christopher L Friend

Stephen J Cook

Brent R Dohner

Michael J Covitch

John R Johnson

Jack C Kelley

Daniel M Vargo

Suzanne Patterson

Rodney John McAtee

David M Hobson

Chor Huang

William Barton

Timothy R Smith

Michael P Gahagan

David Cressey

Simon Evans

Calvin A James

Mark Davies

Jayram D Patel

Gareth Brown

Andrew Gelder

Leonard E Orzech

Daniel Visger

William RS Barton

Rodney J Mcatee

Roy Sambuchino

Lewis D Breon

Simon Griffiths

John D Durham

The invention provides a composition comprising: (a) a star polymer comprising: (i) a core portion comprising a polyvalent (meth) acrylic monomer, oligomer or polymer thereof or a polyvalent divinyl non-acrylic monomer, oligomer or polymer thereof; and (ii) at least two arms of polymerized alkyl (meth)acrylate ester; and (b) an oil of lubricating viscosity, wherein the core portion further comprises a functional group of formula (I):&#x2014;CH&#x2014;C(R)(C(&#x2550;O)A)-Y&#x2014;&#x2003;&#x2003;(I)wherein Ris hydrogen, a linear or branched alkyl group containing 1 to 5 carbon atoms; A is nitrogen or oxygen; and Y is a free radical leaving group selected from the group consisting of one or more atoms or groups of atoms which may be transferred by a radical mechanism under the polymerisation conditions, a halogen, an &#x2014;O&#x2014;N&#x2550; group and an &#x2014;S&#x2014;C(&#x2550;S)&#x2014; group. The invention further provides the use of the composition in an oil of lubricating viscosity as a dispersant, a viscosity modifier or a precursor to a dispersant viscosity modifier.

Star polymers and compositions thereof

The disclosed invention relates to lubricant or functional fluid compositions containing viscosity index improvers in the form of self-healing polymers. The polymers may comprise one or more cleavable linkages, such as one or more disulfide bonds and/or one or more diene/dienophile linkages, to permit the polymer to reform if cleaved during use.

Lubricant and functional fluid compositions containing viscosity index improver

The invention provides a composition comprising: (a) a star polymer comprising: (i) a core portion comprising a polyvalent (meth)acrylic monomer, oligomer or polymer thereof or a polyvalent divinyl non-acrylic monomer, oligomer or polymer thereof; and (ii) at least two arms of polymerized alkyl(meth)acrylate ester; and (b) an oil of lubricating viscosity, wherein the core portion further comprises a functional group of formula (I):&#x2014;CH&#x2014;C(R)(C(&#x2550;O)A)-Y&#x2014;&#x2003;&#x2003;(I)wherein Ris hydrogen, a linear or branched alkyl group containing 1 to 5 carbon atoms; A is nitrogen or oxygen; and Y is a free radical leaving group selected from the group consisting of one or more atoms or groups of atoms which may be transferred by a radical mechanism under the polymerization conditions, a halogen, an &#x2014;O&#x2014;N&#x2550; group and an &#x2014;S&#x2014;C(&#x2550;S)&#x2014; group. The invention further provides the use of the composition in an oil of lubricating viscosity as a dispersant, a viscosity modifier or a precursor to a dispersant viscosity modifier.

The invention provides a lubricating composition containing an oil of lubricating viscosity and a block copolymer of a poly(olefin) block, such as poly(isobutylene) (PIB) and a polyvinyl aromatic) block, such as poly(styrene), wherein the copolymer is optionally functionalized or grafted. The invention further provides a method of using the block copolymer to control deposits in a lubricating oil composition.

Lubricating composition comprising poly (isobutylene) /poly (vinyl aromatic) block copolymer

The invention provides a lubricating composition containing a copolymer comprising units derived from monomers (i) &#x3b1;-olefin and (ii) an ethylenically unsaturated carboxylic acid or derivatives thereof esterified and amidated with an alcohol and an aromatic amine respectively, and an oil of lubricating viscosity. The invention further relates to the use of the lubricating composition in an internal combustion engine.

Lubricating composition containing a dispersant

The invention provides a lubricating composition containing (a) 0.001 wt % to 15 wt % of a polymer with radial or star architecture; (b) an overbased detergent; (c) a dispersant; and (d) an oil of lubricating viscosity. The invention further provides a method for lubricating a mechanical device with the lubricating composition.

Star polymer lubricating composition

The present invention relates to a lubricating composition containing (a) an ester-containing viscosity index improver; and (b) a polyoxyalkylene polyol. The invention further provides a method for lubricating a mechanical device with the lubricating composition.

Lubricant compositions

The disclosed invention relates to a composition comprising a grafted polymer. The polymer comprises a backbone with at least one olefin block and at least one vinyl aromatic block. The polymer is grafted with a pendant carbonyl containing group, the grafting being conducted by halogenating the vinyl aromatic carbon of the vinyl aromatic block and then grafting a carboxylic acid or derivative thereof on the halogenated vinyl aromatic carbon in the presence of an activating agent. The carbonyl containing-group is optionally substituted to provide ester, imide and/or amide functionality. The grafted polymer is useful as a dispersant viscosity modifier in lubricating compositions such as engine oils.

Dispersant viscosity modifiers

The present invention relates to the use of a RAFT polymer as an antiwear agent in a lubricant. The lubricant may be useful in a number of mechanical devices.

Antiwear polymer and lubricating composition thereof

The invention provides a lubricating composition containing an oil of lubricating viscosity and a hydrogenated copolymer of an olefin block and vinyl aromatic block, wherein the copolymer is optionally functionalized. The invention further provides a method for preparing a hydrogenated copolymer; and the use of the lubricating composition.

Polymer and lubricating compositions thereof

An interpolymer composition comprising monomer-derived units of (i) at least one of an aliphatic olefin containing from 2 to 30 carbon atoms and a vinyl aromatic monomer, and (ii) at least one alpha, beta-unsaturated acylating agent; wherein a portion of said acylating agent monomers is esterified and wherein a portion of said acylating agent monomers is condensed with at least one aromatic amine, provides good viscosity modification and dispersancy performance.

Dispersant viscosity modifiers based on maleic anhydride-styrene copolymers

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Littleover, United Kingdom

David Price