Patents by Inventor Hiroshi Sakabe
Hiroshi Sakabe 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).
-
Publication number: 20240166945Abstract: Provided is a method for producing solid-state carbon quantum dots having high emission quantum yield through simple processes. To solve the above issue, a method for producing carbon quantum dots is a method for producing the carbon quantum dots which are solid at 25° C.under 1 atm, the method including: preparing a mixture by mixing an organic compound and a boron compound, the organic compound having a reactive group and not containing a boron atom; and preparing carbon quantum dots by heating the mixture with substantially no solvent at 100° C.or higher and 300° C.or lower. An amount of a nitrogen atom in the organic compound is 20 mass % or greater, and an amount of the boron compound with respect to a total amount of the organic compound and the boron compound is 20 mass % or greater.Type: ApplicationFiled: March 11, 2022Publication date: May 23, 2024Applicant: Kureha CorporationInventors: Yuka TAKAHASHI, Masaki ISHIZU, Hiroshi SAKABE, Takumi KATSURAO
-
Patent number: 11898077Abstract: An object is to provide a composition that contains a phosphorus-containing carbon quantum dot and can efficiently emit relatively long wavelength light. The composition to achieve the above object contains: a phosphorus-containing carbon quantum dot containing phosphorus as a heteroatom; and a smectite.Type: GrantFiled: February 12, 2021Date of Patent: February 13, 2024Assignee: Kureha CorporationInventors: Junya Uchida, Takumi Katsurao, Hiroshi Sakabe
-
Publication number: 20230193124Abstract: An object is to provide a composition containing a boron-containing carbon quantum dot, the composition being in a solid state at room temperature, having good emission efficiency, and further having high thermal stability at high temperatures. The composition to achieve the above object contains: a boron-containing carbon quantum dot containing boron as a heteroatom; and a layered clay mineral, and the composition is solid at 25° C. and 1 atm.Type: ApplicationFiled: February 12, 2021Publication date: June 22, 2023Applicant: Kureha CorporationInventors: Junya UCHIDA, Takumi KATSURAO, Hiroshi SAKABE
-
Publication number: 20230137287Abstract: An object is to provide a composition that contains a phosphorus-containing carbon quantum dot and can efficiently emit relatively long wavelength light. The composition to achieve the above object contains: a phosphorus-containing carbon quantum dot containing phosphorus as a heteroatom; and a smectite.Type: ApplicationFiled: February 12, 2021Publication date: May 4, 2023Applicant: Kureha CorporationInventors: Junya UCHIDA, Takumi KATSURAO, Hiroshi SAKABE
-
Publication number: 20220380217Abstract: An object is to provide a composition which has performance, such as emission wavelength, of carbon quantum dots in a desired range and in which carbon quantum dots and layered clay minerals are uniformly dispersed, and a method for producing the composition to obtain the composition simply and easily. The carbon quantum dot-containing composition achieving the object described above containing a carbon quantum dot obtained by reacting a solid organic compound having a reactive group in the presence of a layered clay mineral, and the layered clay mineral.Type: ApplicationFiled: October 28, 2020Publication date: December 1, 2022Applicant: Kureha CorporationInventors: Takumi KATSURAO, Junya UCHIDA, Hiroshi SAKABE, Masaki ISHIZU
-
Patent number: 11485821Abstract: Provided is a method that can stably produce polyaryletherketone that has a high degree of polymerization and can be easily recovered. The method for producing polyaryletherketone includes: a polycondensation step of carrying out desalting polycondensation in a reaction solvent; and a cooling step of cooling a reaction mixture after desalting polycondensation is completed. When the method is implemented, the polycondensation step is carried out in a hydrophilic solvent under pressurized conditions, and the polymerization temperature in the polycondensation step is at or above the boiling point of the hydrophilic solvent at ambient pressure. In addition, the polymer content in terms of monomers at the time of cooling in the cooling step is from 1 part by mass to 50 parts by mass, per 100 parts by mass of the hydrophilic solvent in the reaction mixture.Type: GrantFiled: October 11, 2018Date of Patent: November 1, 2022Assignee: KUREHA CORPORATIONInventors: Hiroshi Sakabe, Tasutaka Suzuki, Akiko Wakamatsu, Kenji Suzuki
-
Patent number: 11453752Abstract: A method of producing a PAS according to an embodiment of the present invention includes: a polymerizing step; a water removal step; a hydrogen sulfide recovering step in which hydrogen sulfide contained in a gas component produced in the water removal step is absorbed and recovered by an aqueous solution of an alkali metal hydroxide; and a condensation step in which the gas component produced in the water removal step is condensed. The hydrogen sulfide recovering step is performed before the condensation step.Type: GrantFiled: March 19, 2020Date of Patent: September 27, 2022Assignee: Kureha CorporationInventors: Kenji Suzuki, Hiroshi Sakabe, Michihisa Miyahara
-
Patent number: 11383215Abstract: To provide a continuous production apparatus and a continuous production method for an aromatic polymer which enable resource conservation, energy conservation, and equipment costs reduction. A continuous production method for an aromatic polymer having an ether bond or an imide bond, the method including: (a) supplying a polymerization solvent and a reaction raw material to a continuous production apparatus including a plurality of reaction vessels; (b) performing a polycondensation reaction in the polymerization solvent in at least one of the reaction vessels to form a reaction mixture; and (c) successively moving the reaction mixture to each of the reaction vessel, the steps (a), (b), and (c) being performed in parallel; wherein an ether bond or an imide bond is formed by the polycondensation reaction; respective gas phase parts of the plurality of reaction vessels communicate with one another; and a pressure of each of the gas phase parts is uniform.Type: GrantFiled: October 11, 2018Date of Patent: July 12, 2022Assignee: KUREHA CORPORATIONInventors: Hiroshi Sakabe, Michihisa Miyahara, Kenji Suzuki, Tasutaka Suzuki
-
Publication number: 20220204700Abstract: A method of producing a PAS according to an embodiment of the present invention includes: a polymerizing step; a water removal step; a hydrogen sulfide recovering step in which hydrogen sulfide contained in a gas component produced in the water removal step is absorbed and recovered by an aqueous solution of an alkali metal hydroxide; and a condensation step in which the gas component produced in the water removal step is condensed. The hydrogen sulfide recovering step is performed before the condensation step.Type: ApplicationFiled: March 19, 2020Publication date: June 30, 2022Applicant: Kureha CorporationInventors: Kenji SUZUKI, Hiroshi SAKABE, Michihisa MIYAHARA
-
Patent number: 11203665Abstract: The production method of the present invention includes a step of supplying an organic polar solvent, a sulfur source, and a dihalo aromatic compound as reaction raw materials to at least one of a plurality of reaction vessels mutually communicated via a gas phase; a step of removing at least a portion of the water present in the reaction vessels; and a step of performing a polymerization reaction. These steps are carried out in parallel, and the reaction mixture is sequentially moved between reaction vessels. At that time, the internal temperatures of the reaction vessels are all not less than 150° C.Type: GrantFiled: August 21, 2020Date of Patent: December 21, 2021Assignee: KUREHA CORPORATIONInventors: Michihisa Miyahara, Kenji Suzuki, Hiroshi Sakabe, Yoshikatsu Satake
-
Patent number: 11203666Abstract: Provided are a continuous production method and a continuous production apparatus utilizing the solution polycondensation for aromatic cyclic oligomers, which achieve a good space-time yield and are inexpensive and simple. The continuous production method includes: (a) supplying a polymerization solvent and a reaction raw material to a continuous production apparatus; (b) performing a polymerization reaction in the reaction vessels to form a reaction mixture; (c) removing water in gas phase parts of the reaction vessels from the reaction vessels; and (d) successively moving the reaction mixture to each of the reaction vessels; the steps (a), (b), (c), and (d) being performed in parallel; wherein an amount of the polymerization solvent in the reaction vessel positioned furthest downstream in a movement direction of the reaction mixture is not less than 1 L and not greater than 50 L per 1 mol of arylene units in the reaction raw material.Type: GrantFiled: October 11, 2018Date of Patent: December 21, 2021Assignee: KUREHA CORPORATIONInventors: Kenji Suzuki, Michihisa Miyahara, Hiroshi Sakabe
-
Patent number: 11185840Abstract: The present invention provides a continuous polymerization apparatus capable of simply and efficiently separating a polymer and solid matter from a reaction mixture while having an apparatus configuration conducive to washing and maintenance, and a continuous production method for a polymer. A continuous polymerization apparatus (100) includes a plurality of reaction vessels (1a to 1c), wherein the plurality of reaction vessels are configured such that reaction mixtures (9a to 9c) successively move through each reaction vessel; in the plurality of reaction vessels, gas phase parts formed above the reaction mixture communicate with one another; and the continuous polymerization apparatus includes a washing part (5), the washing part configured to separate a solid included in the reaction mixture by sedimentation and to perform countercurrent washing.Type: GrantFiled: October 11, 2018Date of Patent: November 30, 2021Assignee: KUREHA CORPORATIONInventors: Kenji Suzuki, Michihisa Miyahara, Hiroshi Sakabe, Yuichi Ishioka
-
Patent number: 11155682Abstract: The continuous dehydration method for a raw material mixture to be used in the production of PAS includes supply and dehydration of the raw material mixture and extraction of the raw material mixture having a water content reduced by the dehydration, the supply, dehydration and extraction being carried out concurrently in parallel. A dehydration efficiency index determined according to Equation (1) is not less than 0.3. In Equation (1), the dehydration time is a period of time until a moisture content per mole of the sulfur source in the raw material mixture having a reduced water content reaches not greater than 1.7 mol, including moisture consumed by the hydrolysis of the organic polar solvent.Type: GrantFiled: July 12, 2019Date of Patent: October 26, 2021Assignee: KUREHA CORPORATIONInventors: Michihisa Miyahara, Kenji Suzuki, Hiroshi Sakabe
-
Patent number: 11154835Abstract: The present invention provides a continuous polymerization apparatus capable of simply and efficiently separating a polymer and solid matter from a reaction mixture while having an apparatus configuration conducive to washing and maintenance, and a continuous production method for a polymer. A continuous polymerization apparatus (100) includes a plurality of reaction vessels (1a to 1c), wherein the plurality of reaction vessels are configured such that reaction mixtures (9a to 9c) successively move through each reaction vessel; in the plurality of reaction vessels, gas phase parts formed above the reaction mixture communicate with one another; and the continuous polymerization apparatus includes a washing part (5), the washing part configured to separate a solid included in the reaction mixture by sedimentation and to perform countercurrent washing.Type: GrantFiled: October 11, 2018Date of Patent: October 26, 2021Assignee: KUREHA CORPORATIONInventors: Kenji Suzuki, Michihisa Miyahara, Hiroshi Sakabe, Yuichi Ishioka
-
Publication number: 20210198428Abstract: The continuous dehydration method for a raw material mixture to be used in the production of PAS includes supply and dehydration of the raw material mixture and extraction of the raw material mixture having a water content reduced by the dehydration, the supply, dehydration and extraction being carried out concurrently in parallel. A dehydration efficiency index determined according to Equation (1) is not less than 0.3. In Equation (1), the dehydration time is a period of time until a moisture content per mole of the sulfur source in the raw material mixture having a reduced water content reaches not greater than 1.7 mol, including moisture consumed by the hydrolysis of the organic polar solvent.Type: ApplicationFiled: July 12, 2019Publication date: July 1, 2021Inventors: Michihisa MIYAHARA, Kenji SUZUKI, Hiroshi SAKABE
-
Publication number: 20200399425Abstract: Provided is a method that can stably produce polyaryletherketone that has a high degree of polymerization and can be easily recovered. The method for producing polyaryletherketone includes: a polycondensation step of carrying out desalting polycondensation in a reaction solvent; and a cooling step of cooling a reaction mixture after desalting polycondensation is completed. When the method is implemented, the polycondensation step is carried out in a hydrophilic solvent under pressurized conditions, and the polymerization temperature in the polycondensation step is at or above the boiling point of the hydrophilic solvent at ambient pressure. In addition, the polymer content in terms of monomers at the time of cooling in the cooling step is from 1 part by mass to 50 parts by mass, per 100 parts by mass of the hydrophilic solvent in the reaction mixture.Type: ApplicationFiled: October 11, 2018Publication date: December 24, 2020Inventors: Hiroshi SAKABE, Tasutaka SUZUKI, Akiko WAKAMATSU, Kenji SUZUKI
-
Publication number: 20200391168Abstract: To provide a continuous production apparatus and a continuous production method for an aromatic polymer which enable resource conservation, energy conservation, and equipment costs reduction. A continuous production method for an aromatic polymer having an ether bond or an imide bond, the method including: (a) supplying a polymerization solvent and a reaction raw material to a continuous production apparatus including a plurality of reaction vessels; (b) performing a polycondensation reaction in the polymerization solvent in at least one of the reaction vessels to form a reaction mixture; and (c) successively moving the reaction mixture to each of the reaction vessel, the steps (a), (b), and (c) being performed in parallel; wherein an ether bond or an imide bond is formed by the polycondensation reaction; respective gas phase parts of the plurality of reaction vessels communicate with one another; and a pressure of each of the gas phase parts is uniform.Type: ApplicationFiled: October 11, 2018Publication date: December 17, 2020Inventors: Hiroshi SAKABE, Michihisa MIYAHARA, Kenji SUZUKI, Tasutaka SUZUKI
-
Publication number: 20200392291Abstract: Provided are a continuous production method and a continuous production apparatus utilizing the solution polycondensation for aromatic cyclic oligomers, which achieve a good space-time yield and are inexpensive and simple. The continuous production method includes: (a) supplying a polymerization solvent and a reaction raw material to a continuous production apparatus; (b) performing a polymerization reaction in the reaction vessels to form a reaction mixture; (c) removing water in gas phase parts of the reaction vessels from the reaction vessels; and (d) successively moving the reaction mixture to each of the reaction vessels; the steps (a), (b), (c), and (d) being performed in parallel; wherein an amount of the polymerization solvent in the reaction vessel positioned furthest downstream in a movement direction of the reaction mixture is not less than 1 L and not greater than 50 L per 1 mol of arylene units in the reaction raw material.Type: ApplicationFiled: October 11, 2018Publication date: December 17, 2020Inventors: Kenji SUZUKI, Michihisa MIYAHARA, Hiroshi SAKABE
-
Publication number: 20200391172Abstract: The present invention provides a continuous polymerization apparatus capable of simply and efficiently separating a polymer and solid matter from a reaction mixture while having an apparatus configuration conducive to washing and maintenance, and a continuous production method for a polymer. A continuous polymerization apparatus (100) includes a plurality of reaction vessels (1a to 1c), wherein the plurality of reaction vessels are configured such that reaction mixtures (9a to 9c) successively move through each reaction vessel; in the plurality of reaction vessels, gas phase parts formed above the reaction mixture communicate with one another; and the continuous polymerization apparatus includes a washing part (5), the washing part configured to separate a solid included in the reaction mixture by sedimentation and to perform countercurrent washing.Type: ApplicationFiled: October 11, 2018Publication date: December 17, 2020Inventors: Kenji SUZUKI, Michihisa MIYAHARA, Hiroshi SAKABE, Yuichi ISHIOKA
-
Publication number: 20200385525Abstract: The production method of the present invention includes a step of supplying an organic polar solvent, a sulfur source, and a dihalo aromatic compound as reaction raw materials to at least one of a plurality of reaction vessels mutually communicated via a gas phase; a step of removing at least a portion of the water present in the reaction vessels; and a step of performing a polymerization reaction. These steps are carried out in parallel, and the reaction mixture is sequentially moved between reaction vessels. At that time, the internal temperatures of the reaction vessels are all not less than 150° C.Type: ApplicationFiled: August 21, 2020Publication date: December 10, 2020Inventors: MICHIHISA MIYAHARA, KENJI SUZUKI, HIROSHI SAKABE, YOSHIKATSU SATAKE