# US 2021/0276878 A1 · Processes for preparing inorganic carbonates > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0276878 A1 - Document ID: US20210276878A1 - Status: Published application - Kind: A1 - Application number: 16/330,439 - Filed: 2017-09-04 - Published: 2021-09-09 - Earliest claimed: 2016-09-07 - Assignees: Nippon Paper Industries Co., Ltd. - Applicants: Nippon Paper Industries Co., Ltd. - Inventors: Masatoshi Oishi; Toru Nakatani; Moe Fukuoka; Shisei Goto - Web page: https://patentgrep.com/patent/US20210276878A1 ## CPC - C01F 5/24: Magnesium carbonates - C01F 11/181: {Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions} - D06M 11/76: with carbon oxides or carbonates (D06M11/75 takes precedence; with percarbonic acids or their salts D06M11/50; with urea D06M13/432) - D21H 17/70: forming new compounds in situ, e.g. within the pulp or paper, by chemical reaction with other substances added separately - C01P 2004/62: Submicrometer sized, i.e. from 0.1-1 micrometer - C01P 2004/64: Nanometer sized, i.e. from 1-100 nanometer - C01P 2006/12: Surface area - D10B 2201/00: Cellulose-based fibres, e.g. vegetable fibres - C01F: COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides or polysulfides of magnesium, calcium, strontium, or barium C01B17/42; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals C01B21/082; amides or imides of silicon C01B21/087}; metal {imides or} amides C01B21/092, {C01B21/0923}; 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 cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20; {double sulfates of magnesium with sodium or potassium C01D5/12; with other alkali metals C01D15/00, C01D17/00}) - D06M: TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS - D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR - C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS - D10B: INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES ## Abstract The present invention aims to provide techniques for efficiently synthesizing inorganic microparticles. According to the present invention, inorganic carbonate microparticles can be synthesized by generating ultrafine bubbles containing carbonic acid gas by injecting a gas containing carbonic acid gas and a liquid into a reaction vessel through a nozzle to deposit an inorganic carbonate having an average primary particle size of 300 nm or less in the presence of the ultrafine bubbles. ## Claims ### Claim 1 A process for preparing an inorganic carbonate, comprising generating ultrafine bubbles containing carbonic acid gas by injecting a gas containing carbonic acid gas and a liquid into a reaction vessel through a nozzle to deposit an inorganic carbonate having an average primary particle size of 300 nm or less in the presence of the ultrafine bubbles. ### Claim 2 (depends on 1) The process of claim 1, wherein the ultrafine bubbles have an average particle size of 1 to 800 nm. ### Claim 3 (depends on 1) The process of claim 1, wherein the average duration from the generation of the ultrafine bubbles to the disappearance of the ultrafine bubbles is 10 seconds or more. ### Claim 4 (depends on 1) The process of claim 1, wherein the inorganic carbonate is calcium carbonate. ### Claim 5 (depends on 1) The process of claim 1, wherein the inorganic carbonate is magnesium carbonate. ### Claim 6 (depends on 1) The process of claim 1, comprising depositing an inorganic carbonate on a fiber in the presence of the fiber. ### Claim 7 (depends on 1) The process of claim 1, wherein the fiber is a cellulose fiber. ### Claim 8 (depends on 2) The process of claim 2, wherein the average duration from the generation of the ultrafine bubbles to the disappearance of the ultrafine bubbles is 10 seconds or more. ### Claim 9 (depends on 8) The process of claim 8, wherein the inorganic carbonate is calcium carbonate. ### Claim 10 (depends on 9) The process of claim 9, comprising depositing an inorganic carbonate on a fiber in the presence of the fiber. ### Claim 11 (depends on 10) The process of claim 10, wherein the fiber is a cellulose fiber. ### Claim 12 (depends on 8) The process of claim 8, wherein the inorganic carbonate is magnesium carbonate. ### Claim 13 (depends on 12) The process of claim 12, comprising depositing an inorganic carbonate on a fiber in the presence of the fiber. ### Claim 14 (depends on 13) The process of claim 13, wherein the fiber is a cellulose fiber. ### Claim 15 (depends on 3) The process of claim 3, wherein the inorganic carbonate is calcium carbonate. ### Claim 16 (depends on 15) The process of claim 15, comprising depositing an inorganic carbonate on a fiber in the presence of the fiber. ### Claim 17 (depends on 16) The process of claim 16, wherein the fiber is a cellulose fiber. ### Claim 18 (depends on 3) The process of claim 3, wherein the inorganic carbonate is magnesium carbonate. ### Claim 19 (depends on 18) The process of claim 18, comprising depositing an inorganic carbonate on a fiber in the presence of the fiber. ### Claim 20 (depends on 19) The process of claim 19, wherein the fiber is a cellulose fiber.