Patents by Inventor Masayuki Chokai
Masayuki Chokai 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: 11692302Abstract: An object of the present invention is to provide a sizing agent composition that gives a carbon fiber from which a carbon fiber-reinforced composite material having excellent adhesion between a resin and the carbon fiber and having excellent mechanical properties can be formed. The sizing agent composition of the invention is a sizing agent composition comprising (A) a blocked isocyanate, and (B) a compound containing at least one polar group and at least one unsaturated group per molecule. In the invention, the mixing ratio (mass ratio) of the blocked isocyanate (A) and the compound (B) containing at least one polar group and at least one unsaturated group per molecule (A/B) is preferably 95/5 to 5/95. In the invention, the blocked isocyanate (A) is preferably a compound having an aliphatic skeleton.Type: GrantFiled: February 14, 2019Date of Patent: July 4, 2023Assignee: TEIJIN LIMITEDInventors: Takuya Murakami, Masayuki Chokai, Yuki Suzuki, Takeshi Naito
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Publication number: 20230144380Abstract: A polymer (B) essentially contains units represented by the following formulas (1), (2) and (3), wherein the number of moles of unit (1) is 0 to 95, the number of moles of unit (2) is 0 to 50, and the number of moles of unit (3) is 2 to 80 when the total number of moles of units (1), (2) and (3) is 100: In units (1) to (3), “X” is a recurring unit having a benzene ring, in unit (2), —CH3 is substituted on the benzene ring, “m” is an integer of 1-6, unit (3) is obtained by substituting a hydrogen of —CH3 in unit (2) by a substituent “Z” derived from a carboxylic acid or anhydride thereof, “n” is an integer of 1-6 indicative of the number of substitutions, l+n=m, and unit (3) is a unit in which “n” is an integer of 1-6 or a combination thereof.Type: ApplicationFiled: March 29, 2021Publication date: May 11, 2023Applicant: TEIJIN LIMITEDInventors: Akihisa NOMURA, Junshi SOEDA, Masayuki CHOKAI, Katsuhiro YAMANAKA
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Publication number: 20220396065Abstract: An object of the present invention is to provide a heat dissipation sheet having high thermal conductivity in the thickness direction. The present invention provides a heat dissipation sheet having a structure in which at least two thermally conductive insulation layers are laminated, wherein the lamination direction of the thermally conductive insulation layers is substantially perpendicular to the thickness direction of the heat dissipation sheet, and wherein for the entire cross-section perpendicular to the in-plane direction of the heat dissipation sheet, the thermally conductive insulation layer contains 75 to 97% by area of insulating particles, 3 to 25% by area of a binder resin, and 10% by area or less of voids.Type: ApplicationFiled: November 6, 2020Publication date: December 15, 2022Applicant: TEIJIN LIMITEDInventors: Masanori MAEDA, Yoshinori IKEDA, Masayuki CHOKAI, Takuya MURAKAMI
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Publication number: 20220165457Abstract: An object of the present invention is to provide an insulation sheet having high thermal conductivity in the in-plane direction. The present invention provides an insulation sheet comprising insulating particles and a binder resin, wherein, for the entire cross-section of the sheet perpendicular to the in-plane direction, the insulation sheet contains 75 to 97% by area of the insulating particles, 3 to 25% by area of the binder resin, and 10% by area or less of the voids.Type: ApplicationFiled: December 26, 2019Publication date: May 26, 2022Applicant: TEIJIN LIMITEDInventors: Masanori MAEDA, Yoshinori IKEDA, Masayuki CHOKAI, Takuya MURAKAMI
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Publication number: 20210238368Abstract: A composite particle is provided having sufficient insulating properties and high thermal conductivity and also having an excellent handling property and moldability. In particular, a random-shaped composite particle is provided in which primary particles of inorganic filler are aggregated and the primary particles are coated with a thermoplastic resin, and a method for producing the composite particle, as well as a molded article and a method for producing the molded article, are also provided.Type: ApplicationFiled: June 4, 2019Publication date: August 5, 2021Applicant: TEIJIN LIMITEDInventors: Takaya MOYORI, Masayuki CHOKAI, Yoshinori IKEDA, Masanori MAEDA
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Publication number: 20210071356Abstract: An object of the present invention is to provide a sizing agent composition that gives a carbon fiber from which a carbon fiber-reinforced composite material having excellent adhesion between a resin and the carbon fiber and having excellent mechanical properties can be formed. The sizing agent composition of the invention is a sizing agent composition comprising (A) a blocked isocyanate, and (B) a compound containing at least one polar group and at least one unsaturated group per molecule. In the invention, the mixing ratio (mass ratio) of the blocked isocyanate (A) and the compound (B) containing at least one polar group and at least one unsaturated group per molecule (A/B) is preferably 95/5 to 5/95. In the invention, the blocked isocyanate (A) is preferably a compound having an aliphatic skeleton.Type: ApplicationFiled: February 14, 2019Publication date: March 11, 2021Applicant: TEIJIN LIMITEDInventors: Takuya MURAKAMI, Masayuki CHOKAI, Yuki SUZUKI, Takeshi NAITO
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Patent number: 9692060Abstract: A particulate carbon catalyst in which particles having a particle diameter of 20 nm-1 ?m account for a volume fraction of at least 45%, and the content of nitrogen atoms is 0.1-10 atomic % relative to the amount of carbon atoms.Type: GrantFiled: May 21, 2012Date of Patent: June 27, 2017Assignees: TEIJIN LIMITED, TOKYO INSTITUTE OF TECHNOLOGYInventors: Masayuki Chokai, Nobuaki Kido, Yuta Nabae, Masa-aki Kakimoto, Seizo Miyata
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Publication number: 20140087289Abstract: A particulate carbon catalyst in which particles having a particle diameter of 20 nm-1 ?m account for a volume fraction of at least 45%, and the content of nitrogen atoms is 0.1-10 atomic % relative to the amount of carbon atoms.Type: ApplicationFiled: May 21, 2012Publication date: March 27, 2014Applicants: TOKYO INSTITUTE OF TECHNOLOGY, TEIJIN LIMITEDInventors: Masayuki Chokai, Nobuaki Kido, Yuta Nabae, Masa-aki Kakimoto, Seizo Miyata
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Patent number: 7838622Abstract: This invention is to provide a dope that has excellent formability and can be formed into a fiber, a film, pulp-shaped particles and the like by a wet method. This invention is also to provide a process for the production of a fiber excellent in heat resistance, strength and elastic modulus. This invention provides a dope and a process for the production of a fiber from the dope, the dope including a polyamide and a basic solvent, the polyamide containing a recurring unit of the following formula (I), wherein Ar1 represents at least one substituent selected from the group consisting of and having an inherent viscosity of 1.0 or more, the dope has a polyamide concentration of over 10% by weight but not more than 25% by weight and exhibits optical anisotropy at 50° C.Type: GrantFiled: November 1, 2006Date of Patent: November 23, 2010Assignees: Teijin Limited, Teijin Techno Products LimitedInventors: Masayuki Chokai, Anton Peter De Weijer, Hiroaki Kuwahara, Dennis Wilbers
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Patent number: 7833644Abstract: An object of this invention is to provide an electrolytic membrane excellent in ion conductivity and oxidation resistance, and this invention is directed to an electrolytic membrane formed of a polymer comprising at least one recurring unit selected from the group consisting of a recurring unit of the following formula (A), and a recurring unit of the following formula (B), and having a reduced viscosity, measured in a methanesulfonic acid solution having a concentration of 0.5 g/100 ml at 25° C., of 0.05 to 200 dl/g, and a process for the production thereof.Type: GrantFiled: March 16, 2006Date of Patent: November 16, 2010Assignee: Teijin LimitedInventors: Masayuki Chokai, Hiroaki Kuwahara, Bunsow Nagasaka
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Publication number: 20100234538Abstract: There are provided fibers having excellent mechanical strength such as tensile strength and elastic modulus and a polyamide that is a raw material of the fibers. The polyamide is a polyamide (X) which mainly comprises recurring units represented by the following formulae (A) and (B): has an inherent viscosity measured at 30° C. in 0.5 g/100 ml of concentrated sulfuric acid solution of 0.05 to 20 dl/g and has a substituent represented by the following formula (C): wherein Ar3 is a trivalent aromatic hydrocarbon group having 6 to 20 carbon atoms, and Ar4 is a monovalent aromatic hydrocarbon group having 6 to 20 carbon atoms, at at least some of terminals, and the fibers are fibers formed from the polyamide (X).Type: ApplicationFiled: February 14, 2007Publication date: September 16, 2010Applicant: Teijin LimitedInventors: Masayuki Chokai, Anton Peter De Weijer, Hiroaki Kuwahara, Theo Dingemans
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Publication number: 20100222544Abstract: This invention seeks to provide a fiber formed of an aromatic polyazole that has a high molecular weight and is excellent in mechanical properties such as elastic modulus, strength, etc., and a process for the production thereof. This invention provides a fiber formed of a polyazole containing a recurring unit of the following formula (1), wherein Ar1 is a divalent aromatic group having 4 to 20 carbon atoms, Ar2 is a tetravalent aromatic group having 4 to 20 carbon atoms and each X is O, S or NH, and having a phosphorus atom content of 30 ppm or less, and a process for the production thereof.Type: ApplicationFiled: November 2, 2006Publication date: September 2, 2010Applicant: Teijin LimitedInventors: Masayuki Chokai, Anton Peter De Weijer, Susumu Honda, Hiroaki Kuwahara, Dennis Wilbers
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Patent number: 7754328Abstract: Coated carbon nanotubes coated with 0.01-100 parts by weight of at least one type of aromatic condensation polymer selected from the group consisting of wholly aromatic polyamides, wholly aromatic polyesters, aromatic polyester carbonates, aromatic polycarbonates, semi-aromatic polyesters and wholly aromatic azoles, with respect to 100 parts by weight of the carbon nanotubes, as well as a process for their production. Aromatic condensation polymer compositions comprising 0.01-100 parts by weight of the coated carbon nanotubes and 100 parts by weight of an aromatic condensation polymer, and molded articles formed using them.Type: GrantFiled: January 19, 2004Date of Patent: July 13, 2010Assignee: Teijin LimitedInventors: Masayuki Chokai, Hiroaki Kuwahara, Satoru Ohmori, Shunichi Matsumura, Kazuhiko Sato, Susumu Honda
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Publication number: 20100121017Abstract: The invention relates to a fiber, pulp, fibril, or fibrid comprising polybenzazole having a repeating unit of formula (I) or (II) wherein Ar1 and Ar2 are independently an aromatic group having 4 to 12 carbon atoms, Ar1 has the para configuration and 40-100% of the repeating units are repeating unit I and/or repeating unit II and wherein the polybenzazole contains less than 1500 ppm of non-extractable phosphorus compound if 100% of the repeating units are repeating unit I and/or repeating unit II and X and Y are the same. The method allows the manufacture of phosphorous element free a fiber, pulp, fibril, or fibrid containing said polybenzazole precursor or polybenzazole and a spinning method for obtaining said fiber, pulp, fibril, or fibrid.Type: ApplicationFiled: April 24, 2008Publication date: May 13, 2010Applicant: TIEJIN ARAMID B.V.Inventors: Anton Peter De Weijer, Masayuki Chokai, Hiroaki Kuwahara, Dennis Wilbers
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Patent number: 7652124Abstract: There are provided a rigid heterocyclic polymer comprising rigid recurring units such as units represented by the following formulae (a) and (b): wherein X is O, S or NH, a production process thereof, and fibers comprising the polymer.Type: GrantFiled: April 12, 2005Date of Patent: January 26, 2010Assignees: Teijin Limited, Teijin Techno Products LimitedInventors: Masayuki Chokai, Anton Peter De Weijer, Hiroaki Kuwahara, Shunichi Matsumura
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Publication number: 20090127735Abstract: The object of this invention is to provide a dope that has excellent formability and can be formed into a fiber, a film, pulp-shaped particles and the like by a wet method. The object of this invention is also to provide a process for the production of a fiber excellent in heat resistance, strength and elastic modulus. This invention provides a dope and a process for the production of a fiber from the dope, the dope comprising a polyamide and a basic solvent, the polyamide containing a recurring unit of the following formula (I), wherein Ar1 represents at least one substituent selected from the group consisting of and having an inherent viscosity of 1.0 or more, the dope has a polyamide concentration of over 10% by weight but not more than 25% by weight and exhibits optical anisotropy at 50° C.Type: ApplicationFiled: November 1, 2006Publication date: May 21, 2009Applicants: TEIJIN LIMITED, TEIJIN TECHNO PRODUCTS LIMITEDInventors: Masayuki Chokai, Anton Peter De Weijer, Hiroaki Kuwahara, Dennis Wilbers
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Publication number: 20090088505Abstract: The object of this invention is to provide a dope containing a polyamide having a hydroxyl-group-possessing aromatic ring, which exhibits optical anisotropy and has excellent formability, and the dope contains a polymer having a recurring unit of the following formula (I), wherein Ar1 is and having an inherent viscosity of 1.0 or more and a strong-acidity solvent, has a polymer concentration of 5 to 30% by weight and exhibits optical anisotropy at 50° C.Type: ApplicationFiled: May 22, 2006Publication date: April 2, 2009Applicants: Teijin Limited, Teijin Techno Products LimitedInventors: Masayuki Chokai, Anton Peter De Weijer, Susumu Honda, Hiroaki Kuwahara
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Publication number: 20080214772Abstract: There are provided a rigid heterocyclic polymer comprising rigid recurring units such as units represented by the following formulae (a) and (b): wherein X is O, S or NH, a production process thereof, and fibers comprising the polymer.Type: ApplicationFiled: April 12, 2005Publication date: September 4, 2008Inventors: Masayuki Chokai, Anton Peter De Weijer, Hiroaki Kuwahara, Shunichi Matsumura
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Publication number: 20080166619Abstract: An object of this invention is to provide an electrolytic membrane excellent in ion conductivity and oxidation resistance, and this invention is directed to an electrolytic membrane formed of a polymer comprising at least one recurring unit selected from the group consisting of a recurring unit of the following formula (A), and a recurring unit of the following formula (B), and having a reduced viscosity, measured in a methanesulfonic acid solution having a concentration of 0.5 g/100 ml at 25° C., of 0.05 to 200 dl/g, and a process for the production thereof.Type: ApplicationFiled: March 16, 2006Publication date: July 10, 2008Applicant: TEIJIN LIMITEDInventors: Masayuki Chokai, Hiroaki Kuwahara, Bunsow Nagasaka
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Publication number: 20060188718Abstract: A composite fiber, which includes: 100 parts by weight of a wholly aromatic polyamide mainly including structural units of the following formulae (A) and (B): —NH—Ar1—NH—??(A) —OC—Ar2—CO—??(B) where in the formulae (A) and (B), Ar1 and Ar2 each independently represent a bivalent aromatic group having 6 to 20 carbon atoms; and 0.01 to 100 parts by weight of carbon nanotubes with an average diameter of 300 nm or less, and an average aspect ratio of 5.0 or more, characterized in that the carbon nanotubes are oriented in the fiber axis direction. It is excellent in mechanical characteristics.Type: ApplicationFiled: December 3, 2003Publication date: August 24, 2006Inventors: Hideaki Nitta, Masayuki Chokai, Susumu Honda, Satoru Ohmori, Shunichi Matsumura, Kazuhiko Sato, Masaaki Kawamura