Patents by Inventor Hideko Akai
Hideko Akai 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: 10040926Abstract: The present invention provides a rubber modifier capable of exhibiting good dispersibility in a dispersion thereof and excellent in a rubber-modifying effect such as rubber-reinforcing effect or the likes. The invention relates to a rubber modifier comprising cellulose fibers, in which the number of the cellulose fibers having a fiber length of 450 nm or less, relative to the number of all the cellulose fibers therein, is 50% or more, to a rubber modifier dispersion comprising the rubber modifier and a dispersion medium, and to a rubber composition comprising the rubber modifier and a rubber component.Type: GrantFiled: April 23, 2015Date of Patent: August 7, 2018Assignee: MITSUBISHI CHEMICAL CORPORATIONInventors: Hideko Akai, Yasutomo Noishiki
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Patent number: 9896553Abstract: Provided are a method for manufacturing a rubber composition, which method can give a rubber composition provided with excellent reinforcement properties by improving the dispersibility of fibers in a rubber component when the fibers are added to the rubber, a rubber composition obtained using this method, a vulcanized rubber, and a tire. The method is a method for manufacturing a rubber composition comprising short fibers, comprising a dispersion preparation step for preparing a short fiber dispersion by adding the short fibers into a liquid, a mixed dispersion preparation step for preparing a mixed dispersion by adding at least one dispersant selected from the group consisting of carbon black and inorganic compounds into the short fiber dispersion, a mixing step for mixing the mixed dispersion and rubber latex to prepare a rubber-short fiber mixed solution, and a drying step for drying the rubber-short fiber mixed solution to give a rubber composition.Type: GrantFiled: March 14, 2014Date of Patent: February 20, 2018Assignee: BRIDGESTONE CORPORATIONInventors: Saaya Takaoka, Hideko Akai, Sachiko Sawada, Hiroyuki Nagatani, Go Banzashi
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Patent number: 9567455Abstract: Provided are a rubber composition provided with excellent reinforcement properties by improving the dispersibility of fibers in a rubber component when the fibers are added to the rubber, a method for manufacturing the same, a vulcanized rubber, and a tire. A rubber composition comprising a rubber component and short fibers, wherein the short fibers are cationized. A method for manufacturing the rubber composition, comprising a mixing step for mixing cationized short fibers and rubber latex to prepare a rubber-short fiber mixed solution, and a drying step for drying the rubber-short fiber mixed solution to give a rubber composition.Type: GrantFiled: March 14, 2014Date of Patent: February 14, 2017Assignees: BRIDGESTONE CORPORATION, OJI HOLDINGS CORPORATIONInventors: Saaya Takaoka, Hideko Akai, Rie Shirahama, Yasutomo Noishiki, Yuichi Noguchi
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Publication number: 20160032086Abstract: Provided are a rubber composition provided with excellent reinforcement properties by improving the dispersibility of fibers in a rubber component when the fibers are added to the rubber, a method for manufacturing the same, a vulcanized rubber, and a tire. A rubber composition comprising a rubber component and short fibers, wherein the short fibers are cationized. A method for manufacturing the rubber composition, comprising a mixing step for mixing cationized short fibers and rubber latex to prepare a rubber-short fiber mixed solution, and a drying step for drying the rubber-short fiber mixed solution to give a rubber composition.Type: ApplicationFiled: March 14, 2014Publication date: February 4, 2016Applicants: OJI HOLDINGS CORPORATION, BRIDGESTONE CORPORATIONInventors: Saaya TAKAOKA, Hideko AKAI, Rie SHIRAHAMA, Yasutomo NOISHIKI, Yuichi NOGUCHI
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Publication number: 20160009877Abstract: Provided are a method for manufacturing a rubber composition, which method can give a rubber composition provided with excellent reinforcement properties by improving the dispersibility of fibers in a rubber component when the fibers are added to the rubber, a rubber composition obtained using this method, a vulcanized rubber, and a tire. The method is a method for manufacturing a rubber composition comprising short fibers, comprising a dispersion preparation step for preparing a short fiber dispersion by adding the short fibers into a liquid, a mixed dispersion preparation step for preparing a mixed dispersion by adding at least one dispersant selected from the group consisting of carbon black and inorganic compounds into the short fiber dispersion, a mixing step for mixing the mixed dispersion and rubber latex to prepare a rubber-short fiber mixed solution, and a drying step for drying the rubber-short fiber mixed solution to give a rubber composition.Type: ApplicationFiled: March 14, 2014Publication date: January 14, 2016Applicant: BRIDGESTONE CORPORATIONInventors: Saaya TAKAOKA, Hideko AKAI, Sachiko SAWADA, Hiroyuki NAGATANI, Go BANZASHI
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Publication number: 20150225552Abstract: The present invention provides a rubber modifier capable of exhibiting good dispersibility in a dispersion thereof and excellent in a rubber-modifying effect such as rubber-reinforcing effect or the likes. The invention relates to a rubber modifier comprising cellulose fibers, in which the number of the cellulose fibers having a fiber length of 450 nm or less, relative to the number of all the cellulose fibers therein, is 50% or more, to a rubber modifier dispersion comprising the rubber modifier and a dispersion medium, and to a rubber composition comprising the rubber modifier and a rubber component.Type: ApplicationFiled: April 23, 2015Publication date: August 13, 2015Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Hideko AKAI, Yasutomo NOISHIKI
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Patent number: 8992731Abstract: An object of the invention is to provide cellulose fibers which can give a cellulose composite that renders high transparency, a reduction in linear expansion coefficient, and a high modulus of elasticity possible. The invention relates to: a process for producing modified cellulose fibers which includes a modification reaction step of reacting cellulose with an aromatic compound in an organic acid to thereby modify the cellulose with an aromatic-ring-containing substituent; cellulose fibers modified with aromatic-ring-containing substituent; a dispersion of the cellulose fibers; and a cellulose fiber composite obtained from the same.Type: GrantFiled: December 12, 2011Date of Patent: March 31, 2015Assignee: Mitsubishi Chemical CorporationInventor: Hideko Akai
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Patent number: 8771463Abstract: An object of the present invention is to provide a cellulose fiber assembly and a cellulose fiber composite, each having low coloration. The present invention is directed to a method for preparing a fibrillated cellulose fiber assembly, in which the cellulose fiber raw materials are subjected to a fibrillation treatment and a reduction treatment. The present invention provides a method for preparing a cellulose fiber assembly, comprising a fibrillation step of fibrillating cellulose fiber raw materials to obtain fibrillated cellulose fibers, an assembly preparation step of obtaining a cellulose fiber assembly using the fibrillated cellulose fibers, and a step of carrying out a reduction treatment. Further, the present invention provides a cellulose fiber composite comprising the prepared cellulose fiber assembly and a matrix material.Type: GrantFiled: November 15, 2011Date of Patent: July 8, 2014Assignee: Oji Holdings CorporationInventors: Tomokazu Umemoto, Hideko Akai, Yasutomo Noishiki, Go Banzashi
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Publication number: 20130284387Abstract: An object of the present invention is to provide a cellulose fiber assembly and a cellulose fiber composite, each having low coloration. The present invention is directed to a method for preparing a fibrillated cellulose fiber assembly, in which the cellulose fiber raw materials are subjected to a fibrillation treatment and a reduction treatment. The present invention provides a method for preparing a cellulose fiber assembly, comprising a fibrillation step of fibrillating cellulose fiber raw materials to obtain fibrillated cellulose fibers, an assembly preparation step of obtaining a cellulose fiber assembly using the fibrillated cellulose fibers, and a step of carrying out a reduction treatment. Further, the present invention provides a cellulose fiber composite comprising the prepared cellulose fiber assembly and a matrix material.Type: ApplicationFiled: November 15, 2011Publication date: October 31, 2013Applicant: OJI HOLDINGS CORPORATIONInventors: Tomokazu Umemoto, Hideko Akai, Yasutomo Noishiki, Go Banzashi
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Publication number: 20130025920Abstract: The invention relates to a method for producing a microfibrillated cellulose fiber dispersion containing microfibrillated cellulose fibers, at least one of a resin and a resin precursor, and an organic solvent, and the method comprises a fibrillation step of fibrillating cellulose fibers in a starting material dispersion containing cellulose fibers, at least one of a resin and a resin precursor, and an organic solvent, to obtain microfibrillated cellulose fibers.Type: ApplicationFiled: October 1, 2012Publication date: January 31, 2013Inventors: Takanori SHIMIZU, Hideko AKAI, Takayoshi HIRAI, Kazumasa OOTA
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Publication number: 20120125547Abstract: An object of the invention is to provide cellulose fibers which can give a cellulose composite that renders high transparency, a reduction in linear expansion coefficient, and a high modulus of elasticity possible. The invention relates to: a process for producing modified cellulose fibers which includes a modification reaction step of reacting cellulose with an aromatic compound in an organic acid to thereby modify the cellulose with an aromatic-ring-containing substituent; cellulose fibers modified with aromatic-ring-containing substituent; a dispersion of the cellulose fibers; and a cellulose fiber composite obtained from the same.Type: ApplicationFiled: December 12, 2011Publication date: May 24, 2012Applicant: MITSUBISHI CHEMICAL CORPORATIONInventor: Hideko AKAI
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Publication number: 20110274908Abstract: To provide a cellulose fiber composite having high transparency, low water absorption and low coefficient of linear thermal expansion. A fiber composite which comprises fibers having an average fiber diameter of at most 30 nm and a matrix material and which has a haze of at most 5 according to JIS K-7136 when the fiber composite has a thickness of 100 ?m.Type: ApplicationFiled: July 18, 2011Publication date: November 10, 2011Applicant: Mitsubishi Chemical CorporationInventors: Sachiko KOWATA, Akira Watanabe, Hideko Akai
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Patent number: 8012573Abstract: To provide a cellulose fiber composite having high transparency, low water absorption and low coefficient of linear thermal expansion. A fiber composite which comprises fibers having an average fiber diameter of at most 30 nm and a matrix material and which has a haze of at most 5 according to JIS K-7136 when the fiber composite has a thickness of 100 ?m.Type: GrantFiled: December 19, 2008Date of Patent: September 6, 2011Assignee: Mitsubishi Chemical CorporationInventors: Sachiko Kowata, Akira Watanabe, Hideko Akai
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Publication number: 20100272980Abstract: To provide a cellulose fiber composite having high transparency, low water absorption and low coefficient of linear thermal expansion. A fiber composite which comprises fibers having an average fiber diameter of at most 30 nm and a matrix material and which has a haze of at most 5 according to JIS K-7136 when the fiber composite has a thickness of 100 ?m.Type: ApplicationFiled: December 19, 2008Publication date: October 28, 2010Applicant: Mitsubishi Chemical CorporationInventors: Sachiko Kowata, Akira Watanabe, Hideko Akai
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Publication number: 20080275175Abstract: To provide a modified olefin polymer composition comprising a phyllosilicate dispersed in a modified olefin polymer in a sufficiently delaminated state, and an olefin polymer composition comprising a phyllosilicate dispersed in an olefin polymer in a sufficiently delaminated state obtained by diluting the modified olefin polymer composition as a masterbatch diluted with an olefin polymer. A modified olefin polymer composition obtained by mixing a phyllosilicate containing cations of an inorganic compound between layers with a modified olefin polymer having a functional group, and an olefin polymer composition comprising the modified olefin polymer composition diluted with an olefin polymer.Type: ApplicationFiled: March 28, 2006Publication date: November 6, 2008Applicant: Mitsubishi Chemical CorporationInventors: Hideko Akai, Toru Suzuki
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Patent number: 7348382Abstract: A recording liquid capable of giving a printed matter which is high in printing density, is suppressed in blur, has high printing quality, and has good fastness of a recorded matter including light fastness, water fastness and the like and having a low viscosity, good discharge properties and excellent storage stability. The invention is concerned with a polyvinyl alcohol based block copolymer represented by the following general formula (1), a pigment dispersion aqueous liquid containing this polyvinyl alcohol based block copolymer and a pigment in an aqueous medium, and a recording liquid containing this pigment dispersion aqueous liquid. wherein A, B, X1, X2, X3, X4, m1, and m2 have the same meanings as defined in the specification.Type: GrantFiled: October 3, 2005Date of Patent: March 25, 2008Assignee: Mitsubishi Chemical CorporationInventors: Nobuhiko Ueno, Takahiro Saitou, Masanobu Yokoyama, Hideko Akai, Hideaki Tanaka
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Publication number: 20060089423Abstract: A recording liquid capable of giving a printed matter which is high in printing density, is suppressed in blur, has high printing quality, and has good fastness of a recorded matter including light fastness, water fastness and the like and having a low viscosity, good discharge properties and excellent storage stability. The invention is concerned with a polyvinyl alcohol based block copolymer represented by the following general formula (1), a pigment dispersion aqueous liquid containing this polyvinyl alcohol based block copolymer and a pigment in an aqueous medium, and a recording liquid containing this pigment dispersion aqueous liquid. wherein A, B, X1, X2, X3, X4, m1, and m2 have the same meanings as defined in the specification.Type: ApplicationFiled: October 3, 2005Publication date: April 27, 2006Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Nobuhiko Ueno, Takahiro Saitou, Masanobu Yokoyama, Hideko Akai, Hideaki Tanaka
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Patent number: 6610453Abstract: The present invention provides a process for the preparation of a novel toner satisfying a high resolution, a low temperature fixability and a high offset resistance at a low cost. A novel toner for the development of an electrostatic image is provided comprising an agglomerate of particles containing at least primary polymer particles, wherein said primary polymer particles substantially comprise a wax encapsulated therein.Type: GrantFiled: June 23, 1999Date of Patent: August 26, 2003Assignee: Mitsubishi Chemical CorporationInventors: Hideko Akai, Noriaki Takahashi, Usei Jo, Tomohiro Yamazaki, Masahiro Nukui, Kazunori Maruyama, Takashi Kokubo
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Patent number: 6506532Abstract: The present invention provides a process for the preparation of a novel toner satisfying a high resolution, a low temperature fixability and a high offset resistance at a low cost. A novel toner for the development of an electrostatic image is provided comprising an agglomerate of particles containing at least primary polymer particles, wherein said primary polymer particles substantially comprise a wax encapsulated therein.Type: GrantFiled: January 9, 2001Date of Patent: January 14, 2003Assignee: Mitsubishi Chemical CorporationInventors: Hideko Akai, Noriaki Takahashi, Yuqing Xu, Tomohiro Yamazaki, Masahiro Nukui, Kazunori Maruyama, Takashi Kokubo
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Publication number: 20020012863Abstract: The present invention provides a process for the preparation of a novel toner satisfying a high resolution, a low temperature fixability and a high offset resistance at a low cost. A novel toner for the development of an electrostatic image is provided comprising an agglomerate of particles containing at least primary polymer particles, wherein said primary polymer particles substantially comprise a wax encapsulated therein.Type: ApplicationFiled: June 23, 1999Publication date: January 31, 2002Applicant: Hideko AkaiInventors: HIDEKO AKAI, NORIAKI TAKAHASHI, USEI JO, TOMOHIRO YAMAZAKI, MASAHIRO NUKUI, KAZUNORI MARUYAMA, TAKASHI KOKUBO