Patents by Inventor Mitsuo Narita
Mitsuo Narita has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11879022Abstract: There is provided a method for producing a depolymerized cellulose ether having yellowness reduced. More specifically, there is provided a method for producing a depolymerized cellulose ether comprising a depolymerization step of depolymerizing a cellulose ether with an aqueous solution of acid in the presence of a polyhydric alcohol having 2 to 6 carbon atoms.Type: GrantFiled: October 20, 2021Date of Patent: January 23, 2024Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Shinnosuke Inada, Taishi Kitaguchi, Akira Kitamura, Mitsuo Narita
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Patent number: 11851544Abstract: There are provided a porous water-soluble nonionic cellulose ether having an average pore size of 36 ?m or smaller and an average particle size of from 30 to 300 ?m; and a method for continuously producing said cellulose ether comprising the steps of: pulverizing a first water-soluble nonionic cellulose ether to obtain a first pulverized product, and sieving the pulverized product through a sieve having an opening of from 40 to 400 ?m to obtain a first residue-on-sieve and a first sieve-passing fraction, wherein a portion or all of the first residue-on-sieve containing particles having particle sizes smaller than and greater than the opening of the sieve is re-pulverized together with a second water-soluble nonionic cellulose ether in the step of pulverizing to obtain a second pulverized product, which is pulverized to obtain the cellulose ether as a second sieve-passing fraction containing the re-pulverized particles.Type: GrantFiled: August 3, 2020Date of Patent: December 26, 2023Inventor: Mitsuo Narita
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Publication number: 20230365719Abstract: There is provided a method for efficiently produce hydroxypropyl methyl cellulose acetate succinate (HPMCAS) having excellent flowability, where acetic acid in a reaction product mixture subjected to a wash and recovery step can be reduced. More specifically, there is provided a method for producing HPMCAS including an esterification step of esterifying hydroxypropyl methyl cellulose (HPMC) with acetic anhydride and succinic anhydride in acetic acid as a solvent to obtain a reaction product solution containing HPMCAS; a water addition step of adding water to the reaction product solution to obtain a water-added reaction product solution; an acetic acid removal step of removing at least a portion of both the solvent acetic acid and acetic acid derived from the acetic anhydride from the water-added reaction product solution to obtain a mixture having an acetic acid content reduced; and a wash and recovery step of washing the mixture and recovering the HPMCAS.Type: ApplicationFiled: July 19, 2023Publication date: November 16, 2023Inventors: Akiko Miki, Taishi Kitaguchi, Akira Kitamura, Mitsuo Narita
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Publication number: 20230312761Abstract: There is provided a method for producing a hydroxyalkyl alkyl cellulose having a high storage modulus (thermal gel strength) and a small number of undissolved fibers. More specifically, there is provided a method for producing a hydroxyalkyl alkyl cellulose including steps of: bringing sheet-shaped pulp having a pore volume of 0.55 ml/g or more and less than 1.00 ml/g or chip-shaped pulp obtained by cutting the sheet-shaped pulp into contact with a first alkali metal hydroxide solution to obtain an alkali cellulose mixture, removing a liquid from the alkali cellulose mixture to obtain alkali cellulose, reacting the alkali cellulose with an alkylating agent and a hydroxyalkylating agent to obtain a first reaction mixture, mixing the first reaction mixture with a second alkali metal hydroxide solution to obtain a second reaction mixture, and purifying the second reaction mixture to obtain a hydroxyalkyl alkyl cellulose.Type: ApplicationFiled: March 27, 2023Publication date: October 5, 2023Inventors: Akira Kitamura, Mitsuo Narita
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Patent number: 11767371Abstract: There is provided a method for efficiently produce hydroxypropyl methyl cellulose acetate succinate (HPMCAS) having excellent flowability, where acetic acid in a reaction product mixture subjected to a wash and recovery step can be reduced. More specifically, there is provided a method for producing HPMCAS including an esterification step of esterifying hydroxypropyl methyl cellulose (HPMC) with acetic anhydride and succinic anhydride in acetic acid as a solvent to obtain a reaction product solution containing HPMCAS; a water addition step of adding water to the reaction product solution to obtain a water-added reaction product solution; an acetic acid removal step of removing at least a portion of both the solvent acetic acid and acetic acid derived from the acetic anhydride from the water-added reaction product solution to obtain a mixture having an acetic acid content reduced; and a wash and recovery step of washing the mixture and recovering the HPMCAS.Type: GrantFiled: September 24, 2021Date of Patent: September 26, 2023Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Akiko Miki, Taishi Kitaguchi, Akira Kitamura, Mitsuo Narita
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Patent number: 11634510Abstract: There are provided a method for efficiently producing a water-soluble cellulose ether without using a special apparatus, and a novel water-soluble cellulose ether. More specifically, there are provided a method for producing a water-soluble cellulose ether including a first pulverization step of pulverizing a starting water-soluble cellulose ether to obtain a first pulverization product, and a first sieving step of sieving the first pulverization product by using a first sieve whose mesh surface is coated with an inorganic metal compound to obtain a first-sieve-passed water-soluble cellulose ether fraction; and a novel water-soluble cellulose ether.Type: GrantFiled: May 12, 2020Date of Patent: April 25, 2023Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Akira Kitamura, Mitsuhiro Yoshida, Mitsuo Narita
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Publication number: 20220249350Abstract: The objective of the present invention is to provide a composition for aerosol cosmetics employed for producing aerosol cosmetics which easily render the formulation design, have improved dispensability, and stably make a foam with greater foam quality. The objective is achieved by a composition for aerosol cosmetics, comprising hydroxypropyl methylcellulose, an organic solvent and water, wherein a ratio of interfacial elastic modulus (E?) to interfacial viscous modulus (E?) of the hydroxypropyl methylcellulose is equal to or higher than 5.0 when measured with a tensiometer at 25° C. using a 0.2% by mass aqueous solution, and the like.Type: ApplicationFiled: February 4, 2022Publication date: August 11, 2022Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Takane SUDO, Mitsuo NARITA
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Patent number: 11365266Abstract: A method for producing a cellulose ether having a high viscosity while keeping the same degree of polymerization as that in the production of a shaped pulp without changing a raw material or production facility. More specifically, provided is a method for producing a cellulose ether including steps of: cutting or pulverizing pulp to obtain sheet-like, chip-like, or powdery cellulose pulp, wherein the pulp is formed in a form of roll whose surface layer on at least one of the circumferential side and the ends is removed, or in a form of bale whose surface layer on at least one side is removed; bringing the obtained cellulose pulp into contact with an alkali metal hydroxide solution to obtain alkali cellulose; reacting the alkali cellulose with an alkylating agent to obtain a reaction product mixture; and subjecting the reaction product mixture to purification to obtain the cellulose ether.Type: GrantFiled: March 13, 2018Date of Patent: June 21, 2022Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Shintaro Matsusue, Akira Kitamura, Mitsuhiro Yoshida, Mitsuo Narita
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Patent number: 11319385Abstract: There is provided a method for producing hypromellose acetate succinate (HPMCAS), the method not requiring any special device and facilitating removal of impurities. More specifically, there is provided a method for producing HPMCAS, including an esterification step of esterifying hypromellose with an acetylating agent and a succinoylating agent in the presence of an aliphatic carboxylic acid to obtain a reaction product solution containing HPMCAS; a precipitation step of precipitating the HPMCAS by mixing the reaction product solution with water to obtain a suspension of the precipitated HPMCAS; a neutralization step of neutralizing the suspension with a basic substance to obtain a neutralized suspension; and a washing step of washing the HPMCAS contained in the neutralized suspension to obtain the washed HPMCAS.Type: GrantFiled: July 24, 2019Date of Patent: May 3, 2022Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Taishi Kitaguchi, Akiko Tsuchida, Akira Kitamura, Mitsuo Narita
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Patent number: 11319384Abstract: There is provided a method for producing hypromellose phthalate (HPMCP), the method not requiring any special device, and facilitating removal of impurities. More specifically, there is provided a method for producing HPMCP, including an esterification step of esterifying hypromellose with a carboxybenzoylating agent in the presence of an aliphatic carboxylic acid to obtain a reaction product solution containing HPMCP; a precipitation step of precipitating the HPMCP by mixing the reaction product solution with water to obtain a suspension of the precipitated HPMCP; a neutralization step of neutralizing the suspension with a basic substance to obtain a neutralized suspension; and a washing step of washing the HPMCP contained in the neutralized suspension to obtain the washed HPMCP.Type: GrantFiled: July 24, 2019Date of Patent: May 3, 2022Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Akiko Tsuchida, Taishi Kitaguchi, Akira Kitamura, Mitsuo Narita
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Publication number: 20220127379Abstract: There is provided a method for producing a depolymerized cellulose ether, the method suppressing the formation of coarse aggregates during the contact with an acid aqueous solution in a depolymerization reaction, and reducing the amounts of aggregates and black contaminants, while suppressing yellowness. More specifically, there is provided a method for producing a depolymerized cellulose ether, the method including a depolymerization step of depolymerizing a cellulose ether by bring the cellulose ether of 45 to 95° C. into contact with an acid aqueous solution of 55 to 98° C. to obtain a depolymerized cellulose ether.Type: ApplicationFiled: October 20, 2021Publication date: April 28, 2022Inventors: Kentaro Miki, Akira Kitamura, Mitsuo Narita
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Publication number: 20220127380Abstract: There is provided a method for producing a depolymerized cellulose ether having yellowness reduced. More specifically, there is provided a method for producing a depolymerized cellulose ether comprising a depolymerization step of depolymerizing a cellulose ether with an aqueous solution of acid in the presence of a polyhydric alcohol having 2 to 6 carbon atoms.Type: ApplicationFiled: October 20, 2021Publication date: April 28, 2022Inventors: Shinnosuke Inada, Taishi Kitaguchi, Akira Kitamura, Mitsuo Narita
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Patent number: 11299557Abstract: Provided is a method of stably producing a water-soluble nonionic cellulose ether powder having a high bulk density at low cost by adding a minimum amount of water. More specifically provided is a method for producing a water-soluble nonionic cellulose ether powder, comprising the steps of: reacting alkali cellulose with an etherifying agent to obtain a reaction product; washing and draining the reaction product to obtain a water-soluble nonionic cellulose ether; mixing the water-soluble nonionic cellulose ether with such an amount of water of 70° C. or higher as to make a water content of the water-soluble nonionic cellulose ether become 55 to 90% by weight to obtain a water-containing water-soluble nonionic cellulose ether having a water content of 55 to 90% by weight; cooling the water-containing water-soluble nonionic cellulose ether; and drying and pulverizing the cooled water-containing water-soluble nonionic cellulose ether.Type: GrantFiled: March 29, 2017Date of Patent: April 12, 2022Assignee: Shin-Etsu Chemical Co., Ltd.Inventor: Mitsuo Narita
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Publication number: 20220106460Abstract: There is provided a method for efficiently produce hydroxypropyl methyl cellulose phthalate (HPMCP) having excellent flowability, where acetic acid in a reaction product mixture subjected to a wash and recovery step can be reduced. More specifically, there is provided a method for producing HPMCP including an esterification step of esterifying hydroxypropyl methyl cellulose (HPMC) with phthalic anhydride in acetic acid as a solvent to obtain a reaction product solution containing HPMCP; a water addition step of adding water to the reaction product solution to obtain a water-added reaction product solution; an acetic acid removal step of removing at least a portion of the acetic acid from the water-added reaction product solution to obtain a mixture having an acetic acid content reduced; and a wash and recovery step of washing the mixture and recovering the HPMCP.Type: ApplicationFiled: September 24, 2021Publication date: April 7, 2022Inventors: Akiko Miki, Taishi Kitaguchi, Akira Kitamura, Mitsuo Narita
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Publication number: 20220106410Abstract: There is provided a method for efficiently produce hydroxypropyl methyl cellulose acetate succinate (HPMCAS) having excellent flowability, where acetic acid in a reaction product mixture subjected to a wash and recovery step can be reduced. More specifically, there is provided a method for producing HPMCAS including an esterification step of esterifying hydroxypropyl methyl cellulose (HPMC) with acetic anhydride and succinic anhydride in acetic acid as a solvent to obtain a reaction product solution containing HPMCAS; a water addition step of adding water to the reaction product solution to obtain a water-added reaction product solution; an acetic acid removal step of removing at least a portion of both the solvent acetic acid and acetic acid derived from the acetic anhydride from the water-added reaction product solution to obtain a mixture having an acetic acid content reduced; and a wash and recovery step of washing the mixture and recovering the HPMCAS.Type: ApplicationFiled: September 24, 2021Publication date: April 7, 2022Inventors: Akiko Miki, Taishi Kitaguchi, Akira Kitamura, Mitsuo Narita
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Patent number: 11089804Abstract: An oil-in-water type composition which can provide a chewy texture both in a non-cooked state and a heated state and does not show water/oil separation, including: an alkyl cellulose, a 1% by mass aqueous solution of which has a viscosity at 20° C. of from 4,000 to 11,000 mPa·s when measured with a Brookfield type viscometer and a 1.5% by mass aqueous solution of which has a storage modulus G? (65° C.) at 65° C. of from 2,500 to 4,500 Pa; an edible oil or fat; and water. Also provided is a food using the alkyl cellulose.Type: GrantFiled: December 10, 2015Date of Patent: August 17, 2021Assignees: SHIN-ETSU CHEMICAL CO., LTD., SE TYLOSE GMBH & CO. KGInventors: Atsushi Yamamoto, Akira Kitamura, Mitsuo Narita, Heiko Nebel, Anita Hirte
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Publication number: 20210037877Abstract: The objective of the present invention is to provide a composition for aerosol food product that, even when the composition is foamed by using an espuma, can achieve a favorable state of the resulting foam, thereby rendering the obtained aerosol food product desirably palatable. The objective is achieved by a composition for aerosol food product, comprising hydroxypropyl methylcellulose and water, wherein a ratio of interfacial elastic modulus to interfacial viscous modulus of the hydroxypropyl methylcellulose is equal to or higher than 2.0 when measured with a tensiometer at 25° C. using a 0.2% by mass aqueous solution, and the like.Type: ApplicationFiled: August 7, 2020Publication date: February 11, 2021Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Takane SUDO, Mitsuo NARITA, Atsushi YAMAMOTO
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Publication number: 20210037846Abstract: The objective of the present invention is to provide a composition used for producing a whipped cream which can have improved water separation while maintaining moderate overrun, and which further can stably retain a state of cream. The objective is achieved by an oil-in-water type composition for whipped cream, comprising hydroxypropyl methylcellulose, an oil, a non-fat milk solid and water, wherein a ratio of interfacial elastic modulus to interfacial viscous modulus of the hydroxypropyl methylcellulose is equal to or higher than 2.0 when measured with a tensiometer at 25° C. using a 0.2% by mass aqueous solution; and the like.Type: ApplicationFiled: August 7, 2020Publication date: February 11, 2021Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Takane SUDO, Atsushi YAMAMOTO, Mitsuo NARITA
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Patent number: 10881124Abstract: Provided is a method for producing an alkyl cellulose having a high viscosity and not having an excessively high gel strength. More specifically, there is provided a method for producing an alkyl cellulose comprising the steps of: mixing a cellulose pulp with a first alkali metal hydroxide solution with stirring to obtain alkali cellulose; reacting the alkali cellulose with an alkylating agent to obtain a first reaction mixture; blending a second alkali metal hydroxide solution with the first reaction mixture with stirring, without further blending of the alkylating agent, to obtain a second reaction mixture; and purifying the second reaction mixture to obtain an alkyl cellulose. There is also provided an alkyl cellulose being produced by the above method and having a degree of substitution of alkyl group of 27 to 33% by weight.Type: GrantFiled: December 10, 2015Date of Patent: January 5, 2021Assignees: Shin-Etsu Chemical Co., Ltd., SE Tylose GmbH & Co. KGInventors: Akira Kitamura, Atsushi Yamamoto, Mitsuo Narita, Heiko Nebel, Andreas Schultz
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Publication number: 20200385491Abstract: An object of the present invention is to provide a pulverized pulp in which the viscosity reduction caused by pulverization is mitigated and a method for producing cellulose ethers using such pulverized pulp. The above object is achieved by a pulverized pulp of being a pulverized product of a raw material pulp having a pH of 7.5 to 10.5 when measured by dispersing the raw material pulp in water, and having a percent decrease of 30% or less in viscosity caused by pulverization; and a method of producing a cellulose ether including reacting an alkali cellulose obtained from the pulverized pulp and an alkali metal hydroxide solution with an etherifying agent to obtain the cellulose ether.Type: ApplicationFiled: June 4, 2020Publication date: December 10, 2020Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventor: Mitsuo NARITA