# US 9,006,159 B2 · Star polymer lubricating composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,006,159 B2 - Document ID: US9006159B2 - Status: Granted - Kind: B2 - Application number: 13/557,718 - Filed: 2012-07-25 - Published: 2012-11-15 - Granted: 2015-04-14 - Earliest claimed: 2012-07-25 - Assignees: The Lubrizol Corporation - Applicants: Barton J. Schober; Mark C. Davies; Michael R. Sutton; Marina Baum; Daniel C. Visger; David Price; Brent R. Dohner; Mark F. Wilkes - Inventors: Barton J. Schober; Mark C. Davies; Michael R. Sutton; Marina Baum; Daniel C. Visger; David Price; Brent R. Dohner; Mark F. Wilkes - Web page: https://patentgrep.com/patent/US9006159B2 ## CPC - C10M 167/00: Lubricating compositions characterised by the additive being a mixture of a macromolecular compound, a non-macromolecular compound and a compound of unknown or incompletely defined constitution, each of these compounds being essential - C10M 161/00: Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential - C10M 2207/028: Overbased salts thereof - C10M 2207/26: Overbased carboxylic acid salts - C10M 2209/084: Acrylate; Methacrylate - C10M 2215/064: Di- and triaryl amines - C10M 2215/28: Amides; Imides - C10M 2217/00: Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions - C10M 2217/043: Mannich bases - C10M 2219/022: of hydrocarbons, e.g. olefines - C10M 2219/046: Overbased sulfonic acid salts - C10M 2223/045: Metal containing thio derivatives - C10N 2010/12: Groups 6 or 16 - C10N 2020/04: Molecular weight; Molecular weight distribution - C10N 2020/073: {Star shaped polymers} - C10N 2030/52: {Base number [TBN]} - C10N 2040/04: Oil-bath; Gear-boxes; Automatic transmissions; Traction drives - C10N 2040/08: Hydraulic fluids, e.g. brake-fluids - C10N 2040/25: Internal-combustion engines - C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33) - C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS ## Abstract 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. ## Claims ### Claim 1 An engine oil lubricating composition comprising: (a) 0.075 to 8 wt % of a polymer with radial or star architecture, wherein the polymer is a polymethacrylate, or mixtures thereof; wherein the polymethacrylate is derived from a monomer composition consisting essentially of: (i) 65 wt % to 95 wt % of an alkyl methacrylate, wherein the alkyl group of the methacrylate has 12 to 18 carbon atoms; (ii) 5 wt % to 30 wt % of an alkyl methacrylate, wherein the alkyl group of the methacrylate has 1 to 9 carbon atoms; and (iii) 0 wt % to 10 wt % of a nitrogen containing monomer; and wherein the polymer is obtained from a RAFT or ATRP polymerisation process and the polymethacrylate polymeric arm architecture is random; and wherein the polymer has a weight average molecular weight of 300,000 to 800,000; (b) 1 wt % to 4 wt % of an overbased detergent, wherein the overbased detergent comprises one or more of salixarates, phenates, sulphonates, or salicylates; (c) 0.25 wt % to 15 wt % of a dispersant, wherein the dispersant comprises one or more of succinimide dispersants; and (d) an oil of lubricating viscosity, wherein the oil of lubricating viscosity is an API Group II or Group III oil or mixtures thereof; wherein the engine oil lubricating composition provides improved viscosity while maintaining Orbahn shear. ### Claim 2 (depends on 1) The lubricating composition of claim 1, wherein the polymer contains 70 wt % or more of a mono-vinyl monomer. ### Claim 3 (depends on 1) The lubricating composition of claim 1, wherein the polymer is a copolymer. ### Claim 4 (depends on 1) The lubricating composition of claim 1, wherein the lubricating composition further comprises a portion of linear polymer chains. ### Claim 5 (depends on 1) The lubricating composition of claim 1, wherein the polymer comprises arms with random, tapered, di-block, tri-block, or multi-block architecture. ### Claim 6 (depends on 1) The lubricating composition of claim 1 further comprising an antiwear agent. ### Claim 7 (depends on 6) The lubricating composition of claim 6, wherein the antiwear agent comprises a metal dialkyldithiophosphate. ### Claim 8 (depends on 1) The lubricating composition of claim 1 further comprising an antioxidant. ### Claim 9 (depends on 8) The lubricating composition of claim 8, wherein the antioxidant is selected from the group consisting of sulphurised olefins, alkylated diphenylamines, hindered phenols, molybdenum compounds, and mixtures thereof. ### Claim 10 (depends on 9) The lubricating composition of claim 9, wherein the antioxidant is a molybdenum compound, an alkylated diphenylamine or a hindered phenol. ### Claim 11 (depends on 1) The lubricating composition of claim 1, wherein the lubricating composition has a (i) a sulphur content of 0.5 wt % or less, (ii) a phosphorus content of 0.1 wt % or less, and (iii) a sulphated ash content of 1.5 wt % or less. ### Claim 12 (depends on 1) The lubricating composition of claim 1, wherein the lubricating composition has a SAE viscosity grade from XW-Y, where X is an integer from 0 to 20 and Y is an integer from 20 to 50. ### Claim 13 A method for lubricating an internal combustion engine comprising supplying to the internal combustion engine a lubricating composition, wherein the lubricating composition comprises: (a) 0.075 to 8 wt % of a polymer with radial or star architecture, wherein the polymer is a polymethacrylate, or mixtures thereof; wherein the polymethacrylate is derived from a monomer composition consisting essentially of: (i) 65 wt % to 95 wt % of an alkyl methacrylate, wherein the alkyl group of the methacrylate has 10 to 20 carbon atoms; (ii) 5 wt % to 30 wt % of an alkyl methacrylate, wherein the alkyl group of the methacrylate has 1 to 9 carbon atoms; and (iii) 0 wt % to 10 wt % of a nitrogen containing monomer; and wherein the polymer is obtained from a RAFT or ATRP polymerisation process and the polymethacrylate polymeric arm architecture is random; and wherein the polymer has a weight average molecular weight of 300,000 to 800,000; (b) 1 wt % to 4 wt % of an overbased detergent, wherein the overbased detergent comprises one or more of salixarates, phenates, sulphonates, or salicylates; (c) 0.25 wt % to 15 wt % of a dispersant, wherein the dispersant comprises one or more of succinimide dispersants; and (d) an oil of lubricating viscosity. ### Claim 14 (depends on 1) The lubricating composition of claim 1, wherein the polymer has a weight average molecular weight of 400,000 to 800,000. ### Claim 15 (depends on 1) The lubricating composition of claim 1, wherein the polymer has 7 or more arms. ### Claim 16 (depends on 1) The lubricating composition of claim 1, wherein the polymer arms are random. ### Claim 17 A method of providing improved viscosity index while maintaining Orbahn shear in an engine oil, comprising lubricating the engine with a lubricating composition comprising: (a) 0.075 to 8 wt % of a polymer with radial or star architecture, wherein the polymer is a polymethacrylate, or mixtures thereof; wherein the polymethacrylate is derived from a monomer composition consisting essentially of: (i) 65 wt % to 95 wt % of an alkyl methacrylate, wherein the alkyl group of the methacrylate has 12 to 18 carbon atoms; (ii) 5 wt % to 30 wt % of an alkyl methacrylate, wherein the alkyl group of the methacrylate has 1 to 9 carbon atoms; and (iii) 0 wt % to 10 wt % of a nitrogen containing monomer; and wherein the polymer is obtained from a RAFT or ATRP polymerisation process and the polymethacrylate polymeric arm architecture is random; and wherein the polymer has a weight average molecular weight of 300,000 to 800,000; (b) 1 wt % to 4 wt % of an overbased detergent, wherein the overbased detergent comprises one or more of salixarates, phenates, sulphonates, or salicylates; (c) 0.25 wt % to 15 wt % of a dispersant, wherein the dispersant comprises one or more of succinimide dispersants; and (d) an oil of lubricating viscosity, wherein the oil of lubricating viscosity is an API Group II or Group III oil or mixtures thereof.