# US 9,434,903 B2 · Friction-improved polymers for DLC-coated surfaces > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,434,903 B2 - Document ID: US9434903B2 - Status: Granted - Kind: B2 - Application number: 14/005,277 - Filed: 2012-05-10 - Published: 2014-01-02 - Granted: 2016-09-06 - Earliest claimed: 2011-05-17 - Assignees: Evonik Oil Additives GmbH - Applicants: Boris Eisenberg; Torsten Stoehr - Inventors: Boris Eisenberg; Torsten Stoehr - Web page: https://patentgrep.com/patent/US9434903B2 ## CPC - C10M 7/00: {Solid or semi-solid compositions essentially based on lubricating components other than mineral lubricating oils or fatty oils and their use as lubricants; Use as lubricants of single solid or semi-solid substances (compositions in general essentially based on macromolecular compounds C08L)} - C10M 149/00: Lubricating compositions characterised by the additive being a macromolecular compound containing nitrogen - C10M 2203/1025: used as base material - C10M 2205/022: Ethene - C10M 2209/084: Acrylate; Methacrylate - C10M 2209/086: polycarboxylic, e.g. maleic acid - C10M 2215/065: Phenyl-Naphthyl amines - C10M 2217/06: Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound - C10N 2030/06: Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure - C10N 2040/25: Internal-combustion engines - C10N 2050/025: {in the form of films or sheets} - 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 present invention relates to a component part comprising at least two components movable with respect to one another, between the surfaces of which is provided a film formed by a lubricant oil composition, the surface of at least one of the movable components being formed at least partly by a diamond-like-carbon layer (DLC layer) and the lubricant oil composition comprising at least one polymer comprising repeat units derived from amine derivatives of at least one polar ethylenically unsaturated monomer. ## Claims ### Claim 1 An element comprising at least two components movable with respect to one another, between surfaces of which is disposed a film comprising a lubricant oil composition, wherein a surface of at least one of the movable components comprises a diamond-like-carbon layer (DLC layer) and the lubricant oil composition comprises 0.5 to 15% by weight of a polymer comprising a repeat unit derived from an amine derivative of at least one polar ethylenically unsaturated monomer, the amine derivative being derived from N-phenyl-1,4-phenylenediamine, wherein: the polar ethylenically unsaturated monomer from which the amine derivative is derived is maleic anhydride. ### Claim 2 (depends on 1) The element of claim 1, wherein the DLC layer comprises carbon present in a graphite structure, wherein a proportion of the carbon present in a graphite structure, based on an overall amount of carbon, is in a range from 30 to 70 mol %. ### Claim 3 (depends on 1) The element of claim 1, wherein the DLC layer comprises carbon present in a diamond structure, wherein a proportion of the carbon present in a diamond structure, based on an overall amount of carbon, is in a range from 30 to 70 mol %. ### Claim 4 (depends on 1) The element of claim 1, wherein a thickness of the DLC layer is in a range from 1 to 20 μm. ### Claim 5 (depends on 1) The element of claim 1, wherein the polymer comprises 0.1 to 10% by weight of the repeat unit derived from the amine derivative of the polar ethylenically unsaturated monomer. ### Claim 6 (depends on 1) The element of claim 1, wherein the polymer is a polyolefin. ### Claim 7 (depends on 1) The element of claim 1, wherein the polymer is a polyalkyl(meth)acrylate. ### Claim 8 (depends on 1) The element of claim 1, which is an engine. ### Claim 9 (depends on 8) The element of claim 8, wherein at least one of the components movable with respect to one another is a camshaft or a valve. ### Claim 10 (depends on 1) The element of claim 1, wherein the polymer is a graft copolymer where a graft layer comprises the repeat unit derived from the amine derivative of the polar ethylenically unsaturated monomer. ### Claim 11 (depends on 10) The element of claim 10, wherein a graft base of the graft copolymer comprises a polyolefin or a polyalkyl(meth)acrylate. ### Claim 12 (depends on 11) The element of claim 11, wherein the polyolefin is an ethylene-propylene copolymer, and the polyalkyl(meth)acrylate comprises alkyl radicals having from 12 to 18 carbon atoms. ### Claim 13 (depends on 12) The element of claim 12, wherein a thickness of the DLC layer is in a range from 2 to 3 μm. ### Claim 14 (depends on 13) The element of claim 13, wherein the lubricant oil composition further comprises an API group III oil. ### Claim 15 (depends on 1, 14) The element of claim 14, which (i) exhibits a reduction in friction, integrated over a range of sliding speeds of 0.005 to 2.5 m/s, of 20% or more compared to a reference element, and (ii) exhibits a reduction in friction, integrated over a range of sliding speeds of 0.01 to 0.1 m/s, of 35% or more compared to a reference element, wherein the reference element is identical to the element of claim 1 except that the lubricant oil composition of the reference element does not comprise the polymer. ### Claim 16 (depends on 1) The element of claim 1, which exhibits a reduction in friction, integrated over a range of sliding speeds of 0.005 to 2.5 m/s, of 20% or more compared to a reference element, wherein the reference element is identical to the element of claim 1 except that the lubricant oil composition of the reference element does not comprise the polymer. ### Claim 17 (depends on 1) The element of claim 1, which exhibits a reduction in friction, integrated over a range of sliding speeds of 0.01 to 0.1 m/s, of 35% or more compared to a reference element, wherein the reference element is identical to the element of claim 1 except that the lubricant oil composition of the reference element does not comprise the polymer.