# US 2019/0169040 A1 · Method for producing inorganic oxide in form of thin film > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0169040 A1 - Document ID: US20190169040A1 - Status: Published application - Kind: A1 - Application number: 16/324,466 - Filed: 2017-08-08 - Published: 2019-06-06 - Earliest claimed: 2016-08-09 - Assignees: Kao Corporation - Applicants: Kao Corporation - Inventors: Tsuyoshi ODA; Ryo ONISHI - Web page: https://patentgrep.com/patent/US20190169040A1 ## CPC - C01G 23/04: Oxides; Hydroxides - C01B 13/36: by precipitation reactions in {aqueous} solutions {(C01B13/328 takes precedence)} - C01G 25/02: Oxides - C09D 11/00: Inks - C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20) - C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C} - 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) ## Abstract Provided is a method for producing an inorganic oxide in the form of a thin film, the method including a step of bringing a first liquid and a second liquid with each other, the first liquid containing an inorganic oxide precursor and the second liquid containing a substance reacting with the inorganic oxide precursor of the first liquid to form an inorganic oxide derived from the inorganic oxide precursor. The step is performed by continuous operation. At least one of the first liquid and the second liquid includes an ionic liquid. ## Claims ### Claim 1 A method for producing an inorganic oxide in a form of a thin film, the method comprising bringing a first liquid and a second liquid into contact with each other, the first liquid containing an inorganic oxide precursor and the second liquid containing a substance reacting with the inorganic oxide precursor of the first liquid to form an inorganic oxide derived from the inorganic oxide precursor, wherein the bringing of the first liquid into contact with the second liquid is performed by continuous operation, and at least one of the first liquid and the second liquid includes an ionic liquid. ### Claim 2 (depends on 1) The method of claim 1, wherein the inorganic oxide in the form of the thin film has an average thickness of 0.01 μm or larger and 1.5 μm or smaller. ### Claim 3 (depends on 1) The method of claim 1, wherein the inorganic oxide in the form of the thin film includes a titanium oxide in a form of a thin film. ### Claim 4 (depends on 1) The method of claim 1, wherein the first liquid and the second liquid phase-separate from each other. ### Claim 5 (depends on 1) The method of claim 1, wherein the ionic liquid includes an ionic liquid having 1-alkyl-3-methylimidazolium cations. ### Claim 6 (depends on 1) The method of claim 1, wherein the inorganic oxide precursor includes a metal alkoxide. ### Claim 7 (depends on 1) The method of claim 1, wherein the second liquid is a solution in which the substance to form the inorganic oxide is dissolved in the ionic liquid. ### Claim 8 (depends on 1) The method of claim 1, wherein the first liquid is a solution in which the inorganic oxide precursor is dissolved in an organic solvent. ### Claim 9 (depends on 1) The method of claim 1, wherein the first liquid contains one or two or more of toluene, hexane, heptane, benzene, and chloroform. ### Claim 10 (depends on 1) The method of claim 1, wherein an interfacial tension of the first liquid to the second liquid at a temperature at a time of contact between the first liquid and the second liquid is 0.1 mN/m or more and 30 mN/m or less. ### Claim 11 (depends on 1) The method of claim 1, wherein when both of the first liquid and the second liquid are allowed to flow, a ratio of a linear flow velocity of the first liquid to a linear flow velocity of the second liquid at a time of contact between the first liquid and the second liquid is 0.01 or more and 100 or less. ### Claim 12 (depends on 1) The method of claim 1, wherein when both of the first liquid and the second liquid are allowed to flow, a ratio of a Reynolds number of the first liquid to a Reynolds number of the second liquid until a time when the first liquid and the second liquid come into contact with each other is 4 or more and 1000 or less. ### Claim 13 (depends on 1) The method of claim 1, wherein a duration of contact between the first liquid and the second liquid is 0.5 sec or longer and 600 sec or shorter. ### Claim 14 (depends on 1) The method of claim 1, wherein a reaction temperature at a time of contact between the first liquid and the second liquid is 0° C. or higher and 100° C. or lower. ### Claim 15 (depends on 1) The method of claim 1, wherein the inorganic oxide in the form of the thin film has an average longitudinal diameter of 2 μm or larger and 300 μm or smaller. ### Claim 16 (depends on 1) The method of claim 1, wherein the inorganic oxide in the form of the thin film has a ratio of an average longitudinal diameter to an average thickness is 5 or more and 2000 or less. ### Claim 17 (depends on 1) The method of claim 1, wherein the ionic liquid includes ammonium cations. ### Claim 18 (depends on 1) The method of claim 1, wherein the ionic liquid includes 1-methyl-3-methylimidazolium cations, 1-ethyl-3-methylimidazolium cations, 1-propyl-3-methylimidazolium cations, or 1-butyl-3-methylimidazolium cations. ### Claim 19 (depends on 1) The method of claim 1, wherein the inorganic oxide precursor includes a titanium alkoxide or a zirconium alkoxide. ### Claim 20 (depends on 19) The method of claim 19, wherein the titanium alkoxide includes tetraethyl orthotitanate, tetraisopropyl orthotitanate, or tetra-n-butyl orthotitanate. ### Claim 21 (depends on 1) The method of claim 1, wherein a content of the inorganic oxide precursor in the first liquid is 1% by mass or more to 80% by mass or less. ### Claim 22 (depends on 1) The method of claim 1, wherein a content of the substance in the second liquid to form the inorganic oxide is 0.1% by mass or more to 70% by mass or less.