# US 2010/0167066 A1 · Self-Cleaning Article and a Process for Preparing the Same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0167066 A1 - Document ID: US20100167066A1 - Status: Published application - Kind: A1 - Application number: 12/639,652 - Filed: 2009-12-16 - Published: 2010-07-01 - Earliest claimed: 2008-12-31 - Assignees: Posco; DPI Holdings Co., Ltd. - Inventors: Hye Jin Yoo; Wook Hyun Song; Gab Yong Kim; Jae Ryung Lee; Jae Dong Cho - Web page: https://patentgrep.com/patent/US20100167066A1 ## CPC - C23C 22/44: containing also fluorides or complex fluorides - B01J 21/063: {Titanium; Oxides or hydroxides thereof} - B01J 23/02: of the alkali- or alkaline earth metals or beryllium - B01J 23/22: Vanadium - B01J 23/28: Molybdenum - B01J 23/34: Manganese - B01J 35/39: Photocatalytic properties - B01J 37/0225: {of metal substrates} - B01J 37/033: {Using Hydrolysis} - C09D 1/04: with organic additives - C09D 5/084: {Inorganic compounds} - C09D 5/1618: {inorganic} - C23C 18/122: {Inorganic polymers, e.g. silanes, polysilazanes, polysiloxanes} - C23C 18/1225: {Deposition of multilayers of inorganic material} - C23C 18/1241: {Metallic substrates} - C23C 18/1254: {Sol or sol-gel processing} - C23C 18/127: {Preformed particles} - C23C 2222/20: Use of solutions containing silanes - Y10T 428/31663: As siloxane, silicone or silane - C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) - B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Provided is a composition for forming a photocatalytic coating layer, a process for preparing said composition, a self-cleaning article comprising a photocatalytic coating layer comprising said composition and a process for preparing said self-cleaning article. The composition may be used to prepare a self-cleaning article having excellent anticorrosion and processability by one coating and drying procedure, without several coating and drying procedures. ## Claims ### Claim 1 A composition characterized in that it comprises a cohydrolysis condensate of a SiO2 sol, silane and a TiO2 sol, wherein said cohydrolysis condensate comprises a unit of the following Formula 1: —Si—O—Ti— [Formula 1] ### Claim 2 (depends on 1) The composition according to claim 1, wherein said SiO2 sol is a sol that silica in a nano size is water-dispersed. ### Claim 3 (depends on 1) The composition according to claim 1, wherein said SiO2 sol is an acidic or neutral SiO2 sol. ### Claim 4 (depends on 1) The composition according to claim 1, wherein said SiO2 sol is included in an amount of 1 to 20 parts by weight, relative to 100 parts by weight of the total composition. ### Claim 5 (depends on 1) The composition according to claim 1, wherein said silane is one component selected from the group consisting of tetramethoxysilane, tetraethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, phenyltrimethoxysilane, diphenyldimethoxysilane, decyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 2-(3,4-epoxycyclohexyl)-ethyltrimethoxysilane, 3-glycidoxypropyl trimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, N-(2-amino ethyl)-3-aminopropylmethyldimethoxysilane, N-(2-amino ethyl)-3-aminopropyltrimethoxysilane, N-(2-amino ethyl)-3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, and 3-aminopropyltriethoxy silane, or a cohydrolysis condensate of at least two components thereof. ### Claim 6 (depends on 1) The composition according to claim 1, wherein said silane is included in an amount of 1 to 30 parts by weight, relative to 100 parts by weight of the total composition. ### Claim 7 (depends on 1) The composition according to claim 1, wherein said TiO2 sol is an acidic or neutral TiO2 sol. ### Claim 8 (depends on 1) The composition according to claim 1, wherein said TiO2 sol is included in an amount of 5 to 60 parts by weight, relative to 100 parts by weight of the total composition. ### Claim 9 (depends on 1) The composition according to claim 1, further comprising at least one additive for anticorrosion selected from the group consisting of an organic acid salt, an inorganic acid salt and a hydroxide of a metal. ### Claim 10 (depends on 9) The composition according to claim 9, comprising a unit represented by Formula 2: —Si—O-M- [Formula 2] wherein, M represents a metal. ### Claim 11 (depends on 9) The composition according to claim 9, wherein said metal is at least one metal selected from the group consisting of Al, Ti, Mo, V, Mn, Mg and Zr. ### Claim 12 (depends on 9) The composition according to claim 9, wherein said additive for anticorrosion is included in an amount of 0.1 to 5 parts by weight, relative to 100 parts by weight of the total composition. ### Claim 13 A process for preparing a cohydrolysis condensate of a SiO2 sol, silane and a TiO2 sol comprising a step of preparing a silane solution; and a step of mixing a mixed solution of a SiO2 sol and a TiO2 sol with said silane solution to be subjected to a sol-gel reaction of the SiO2 sol, silane and the TiO2 sol. ### Claim 14 (depends on 13) The process for preparing a cohydrolysis condensate of a SiO2 sol, silane and a TiO2 sol according to claim 13, wherein the silane solution is prepared by stirring silane and at least one additive for anticorrosion selected from the group consisting of an organic acid salt, an inorganic acid salt and a hydroxide of a metal. ### Claim 15 (depends on 13) A cohydrolysis condensate of a SiO2 sol, silane and a TiO2 sol, characterized in that it is prepared by a process for preparing according to claim 13. ### Claim 16 (depends on 1) A self-cleaning article comprising a substrate; and a coating layer containing a composition according to claim 1 applied on said substrate. ### Claim 17 (depends on 16) The self-cleaning article according to claim 16, wherein said substrate is a steel sheet. ### Claim 18 (depends on 16) The self-cleaning article according to claim 16, wherein said steel sheet is a galvanized steel sheet. ### Claim 19 (depends on 16) The self-cleaning article according to claim 16, characterized in that said coating layer is one obtained by forming a layer for improving adhesion comprising a unit of [—Si—O—]; a layer for improving anticorrosion comprising a unit of [—Si—O-M-], wherein M represents a metal; and a self-cleaning layer comprising a unit of [—Si—O—Ti—] sequentially from a substrate.