Patents by Inventor Koji Kutsuwa
Koji Kutsuwa 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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Publication number: 20230287626Abstract: An object of the present invention is to provide a coated paper that includes a coating layer containing poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) with few coating defects. As a solution, the present invention provides a coated paper including a coating layer containing poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) and an adhesive, on at least one side of a paper substrate. A solid content weight ratio of the poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) to the adhesive in the coating layer is 99.9/0.1 to 60.0/40.0.Type: ApplicationFiled: June 10, 2021Publication date: September 14, 2023Inventors: Hirosuke TSUNODA, Yoshio YOSHIDA, Koji KUTSUWA, Tetsuo OKURA, Yasunori OKADA, Asuka FUKUTOME
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Patent number: 11511557Abstract: An inkjet recording medium, comprising an ink-receiving layer containing an inorganic pigment, a binder, an inkjet ink-fixing agent comprising a cationic compound, and organic spherical particles disposed on at least one surface of a base paper, wherein the ink-receiving layer further contains a water-soluble metal salt and 5 parts by weight or more to 15 parts by weight or less of polyvinyl alcohol (A) with a polymerization degree of 700 or less and 20 parts by weight or more to 40 parts by weight or less of polyvinyl alcohol (B) with a polymerization degree of 1200 or more as the binder with respect to 100 parts by weight of the ink-receiving layer; and a volume 50% average particle diameter (D50) as measured by a laser diffraction/scattering method of the organic spherical particles is 15.0 ?m or more.Type: GrantFiled: August 31, 2018Date of Patent: November 29, 2022Assignee: Nippon Paper Industries Co., Ltd.Inventors: Koji Kutsuwa, Tadashi Yoshida, Kentaro Kawasaki
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Publication number: 20200406658Abstract: Provided is a thermosensitive recording medium, which is excellent in color developing property, especially excellent in bar code readability, under severe environment, further, excellent in resistance to discoloration under severe environment. That is a thermosensitive recording medium having a thermosensitive recording layer comprising a colorless or pale colored electron donating leuco dye and an electron accepting color developing agent on a substrate, wherein the thermosensitive recording layer comprises, as the electron accepting color developing agent, a specific sulfone compound and a phenolic compound in a specific ratio, wherein the phenolic compound contains two or more hydroxyl groups and two or more diphenylsulfone backbone but contains neither urethane bond nor urea bond. The thermosensitive recording layer optionally may further comprise a specific urea-urethane-based compound.Type: ApplicationFiled: March 1, 2019Publication date: December 31, 2020Inventors: Kenji Hirai, Koji Kutsuwa, Yoshimi Midorikawa
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Publication number: 20200282756Abstract: An inkjet recording medium, comprising an ink-receiving layer containing an inorganic pigment, a binder, an inkjet ink-fixing agent comprising a cationic compound, and organic spherical particles disposed on at least one surface of a base paper, wherein the ink-receiving layer further contains a water-soluble metal salt and 5 parts by weight or more to 15 parts by weight or less of polyvinyl alcohol (A) with a polymerization degree of 700 or less and 20 parts by weight or more to 40 parts by weight or less of polyvinyl alcohol (B) with a polymerization degree of 1200 or more as the binder with respect to 100 parts by weight of the ink-receiving layer; and a volume 50% average particle diameter (D50) as measured by a laser diffraction/scattering method of the organic spherical particles is 15.0 ?m or more.Type: ApplicationFiled: August 31, 2018Publication date: September 10, 2020Inventors: Koji Kutsuwa, Tadashi Yoshida, Kentaro Kawasaki
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Patent number: 10549565Abstract: An inkjet recording medium having an ink receiving layer containing an inorganic pigment, starch, and copolymer latex on at least one surface of a base, characterized in that the inorganic pigment contains engineered calcium carbonate and kaolin, an amount of the engineered calcium carbonate is from 50% by weight or more to less than 80% by weight and an amount of the kaolin is from 10% by weight or more to less than 50% by weight with respect to a total amount of the inorganic pigment, and from 1 parts by weight or more to 10 parts by weight or less of an organic pigment having a glass transition temperature (Tg) of 20° C. or more is contained in the ink receiving layer with respect to 100 parts by weight of the inorganic pigment.Type: GrantFiled: September 28, 2016Date of Patent: February 4, 2020Assignees: Nippon Paper Industries Co., Ltd., Kao CorporationInventors: Koji Kutsuwa, Yasufumi Ueda, Takayuki Suzuki
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Publication number: 20190047308Abstract: An inkjet recording medium having an ink receiving layer containing an inorganic pigment, starch, and copolymer latex on at least one surface of a base, characterized in that the inorganic pigment contains engineered calcium carbonate and kaolin, an amount of the engineered calcium carbonate is from 50% by weight or more to less than 80% by weight and an amount of the kaolin is from 10% by weight or more to less than 50% by weight with respect to a total amount of the inorganic pigment, and from 1 parts by weight or more to 10 parts by weight or less of an organic pigment having a glass transition temperature (Tg) of 20° C. or more is contained in the ink receiving layer with respect to 100 parts by weight of the inorganic pigment.Type: ApplicationFiled: September 28, 2016Publication date: February 14, 2019Inventors: Koji Kutsuwa, Yasufumi Ueda, Takayuki Suzuki
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Patent number: 10179470Abstract: An inkjet recording method for printing an inkjet recording medium comprising an ink-receiving layer containing inorganic pigment, starch and copolymer latex on a surface of a base with inkjet ink as aqueous pigment ink, a content of the inorganic pigment being 10 g/m2 or more to 35 g/m2 or less in the ink-receiving layer, and a content of calcium carbonate being from 80% by weight or more to 100% by weight or less, the inkjet ink containing one or more selected from self dispersed pigment and pigment containing water-insoluble polymer particles, from 10% by weight or more to 48% by weight or less of a water-soluble organic solvent A having a boiling point of 230° C. or less, from 0% by weight or more to 5.0% by weight or less of a water-soluble organic solvent B having a boiling point of 280° C. or more, from 42% by weight or more to 70% by weight or less of water.Type: GrantFiled: June 24, 2015Date of Patent: January 15, 2019Assignees: Nippon Paper Industries Co., Ltd., Kao CorporationInventors: Koji Kutsuwa, Masaaki Nakano, Yasufumi Ueda, Teruyuki Fukuda, Kaname Mitsuyoshi, Takayuki Suzuki
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Publication number: 20170259602Abstract: An inkjet recording method for printing an inkjet recording medium comprising an ink-receiving layer containing inorganic pigment, starch and copolymer latex on a surface of a base with inkjet ink as aqueous pigment ink, a content of the inorganic pigment being 10 g/m2 or more to 35 g/m2 or less in the ink-receiving layer,and a content of calcium carbonate being from 80% by weight or more to 100% by weight or less, the inkjet ink containing one or more selected from self dispersed pigment and pigment containing water-insoluble polymer particles, from 10% by weight or more to 48% by weight or less of a water-soluble organic solvent A having a boiling point of 230° C. or less, from 0% by weight or more to 5.0% by weight or less of a water-soluble organic solvent B having a boiling point of 280° C. or more, from 42% by weight or more to 70% by weight or less of water.Type: ApplicationFiled: June 24, 2015Publication date: September 14, 2017Inventors: Koji Kutsuwa, Masaaki Nakano, Yasufumi Ueda, Teruyuki Fukuda, Kaname Mitsuyoshi, Takayuki Suzuki
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Patent number: 9242497Abstract: An inkjet recording medium, comprising an ink-receiving layer containing a pigment, a binder and an inkjet ink-fixing agent comprising a cationic compound disposed on at least one surface of a base paper, wherein 50% or more by weight of calcium carbonate is contained in terms of a solid content based on a total amount of the pigment contained in the ink-receiving layer; 75 to 90 parts by weight of the pigment, 1 to 10 parts by weight of the binder and 5 to 20 parts by weight of the inkjet ink-fixing agent are contained based on 100 parts by weight of the ink-receiving layer; the drop water absorbency of the ink-receiving layer (according to the drop water absorbency defined in Japan Technical Association of the Pulp and Paper Industry, J. TAPPI, No. 32-2:2000 except that a drop water amount is 0.001 ml) is 200 seconds or less; and a Stockigt sizing degree according to JIS-P-8122 for the inkjet recording medium is 5 seconds or less.Type: GrantFiled: July 29, 2013Date of Patent: January 26, 2016Assignee: Nippon Paper Industries Co., Ltd.Inventors: Misaki Watanabe, Akinobu Chatani, Satoshi Tsuda, Tadashi Yoshida, Takanori Otsuhata, Koji Kutsuwa
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Publication number: 20150298479Abstract: An inkjet recording medium, comprising an ink-receiving layer containing a pigment, a binder and an inkjet ink-fixing agent comprising a cationic compound disposed on at least one surface of a base paper, wherein 50% or more by weight of calcium carbonate is contained in terms of a solid content based on a total amount of the pigment contained in the ink-receiving layer; 75 to 90 parts by weight of the pigment, 1 to 10 parts by weight of the binder and 5 to 20 parts by weight of the inkjet ink-fixing agent are contained based on 100 parts by weight of the ink-receiving layer; the drop water absorbency of the ink-receiving layer (according to the drop water absorbency defined in Japan Technical Association of the Pulp and Paper Industry, J. TAPPI, No. 32-2:2000 except that a drop water amount is 0.001 ml) is 200 seconds or less; and a Stockigt sizing degree according to WS-P-8122 for the inkjet recording medium is 5 seconds or less.Type: ApplicationFiled: July 29, 2013Publication date: October 22, 2015Inventors: Misaki Watanabe, Akinobu Chatani, Satoshi Tsuda, Tadashi Yoshida, Takanori Otsuhata, Koji Kutsuwa
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Patent number: 8414739Abstract: There is provided a filled paper containing a coated filler obtained by coating a filler with a acrylamide copolymer (composite PAM) comprising (A) an anionic polysaccharide and (B) a cationic and/or an amphoteric acrylamide copolymer. The composite PAM is obtained, for example, by mixing the component (A) and the component (B). Since the filler is treated with a combination of the components (A) and (B) different from each other in charge properties and structure, suitable coagulation effect can be attained and the coated filler has excellent affinity for pulp slurry. Therefore, even in the case of a highly filled paper, a large paper strengthening effect can be attained by using a small amount of the chemical agent.Type: GrantFiled: March 16, 2006Date of Patent: April 9, 2013Assignees: Harima Chemicals, Inc., Nippon Paper Industries Co., Ltd.Inventors: Yoshiharu Kimura, Takao Sezaki, Yuko Iijima, Koji Kutsuwa
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Patent number: 8377259Abstract: The present invention provides a process for preparing a coated printing paper, comprising the steps of making a base paper from a stuff containing a hardwood-derived mechanical pulp (LMP) and applying a coating solution containing a pigment and an adhesive by an on-machine coater to provide a coating layer, wherein said steps are continuously performed on machine. According to the present invention, coated printing papers having high quality can be efficiently prepared with high runnability.Type: GrantFiled: August 7, 2009Date of Patent: February 19, 2013Assignee: Nippon Paper Industries Co., Ltd.Inventors: Osamu Kozuka, Koji Kutsuwa, Kazuhiko Ishizuka, Takehiro Yoshimatsu
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Publication number: 20120043372Abstract: The present invention aims to provide a cast-coated paper having good coated paper quality and printability combined with the property of decomposing hazardous substances upon exposure to light. A cast-coated paper prepared by applying a cast-coating layer based on a pigment and a binder on abase paper and finished by pressing the cast-coating layer in the wet state against a heated cast drum surface and drying it, wherein the cast-coating layer contains 1-30 parts by weight of titanium dioxide having an average secondary particle diameter of 300-2000 nm per 100 parts by weight of the pigment and the titanium dioxide is premixed with a silica sol or alumina sol at a ratio of the titanium dioxide to the silica sol or alumina sol of 2:1-1:2.Type: ApplicationFiled: June 7, 2007Publication date: February 23, 2012Applicants: NIPPON PAPER CRECIA CO., LTD., NIPPON PAPER INDUSTRIES CO., LTD.Inventors: Hiroshi Koyamoto, Koji Kutsuwa, Masashi Okamoto, Hidehiko Kai, Koji Okomori, Takashi Ochi, Noriyuki Ishibashi, Nobumasa Hayashi
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Publication number: 20110180224Abstract: The present invention provides a process for preparing a coated printing paper, comprising the steps of making a base paper from a stuff containing a hardwood-derived mechanical pulp (LMP) and applying a coating solution containing a pigment and an adhesive by an on-machine coater to provide a coating layer, wherein said steps are continuously performed on machine. According to the present invention, coated printing papers having high quality can be efficiently prepared with high runnability.Type: ApplicationFiled: August 7, 2009Publication date: July 28, 2011Applicant: NIPPON PAPER INDUSTRIES CO., LTD.Inventors: Osamu Kozuka, Koji Kutsuwa, Kazuhiko Ishizuka, Takehiro Yoshimatsu
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Patent number: 7611606Abstract: The present invention provides a low-density neutral paper offering excellent opacity, opacity after printing and other advantageous printability properties despite high bulk, by containing, as a filler, precipitated calcium carbonate-silica composite having an average particle size of 30 ?m or less and produced by neutralizing a mixture of precipitated calcium carbonate and alkaline silicate to pH 7 to 9, wherein the ratio of precipitated calcium carbonate to silica (precipitated calcium carbonate/silica) is 30/70 to 70/30 in solid content by weight and the surface of precipitated calcium carbonate particles is covered with silica. In particular, the present invention provides a low-density printing paper, or an electrophotographic transfer paper offering excellent stiffness and copier suitability, by means of adjusting the filler content in paper to a range of 1 to 25 solid content percent by weight, or provides a neutral newsprinting paper by means of adjusting the filler content in paper to a range of 0.Type: GrantFiled: March 15, 2005Date of Patent: November 3, 2009Assignee: Nippon Paper Industries Co., Ltd.Inventors: Kazunari Soga, Dai Nagahara, Kazuyuki Fujita, Takashi Ochi, Koji Kutsuwa, Katsumasa Ono
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Publication number: 20090162642Abstract: Provide a paper offering good paper strength properties in terms of strength and stiffness, high smoothness and excellent printing quality by adjusting the ash content in paper to a range of 3 to 40 percent by solid weight and allowing the paper to contain a pre-coagulated filler having an average particle size of 10 to 80 ?m as measured by the laser diffraction method, wherein such filler is obtained by processing a filler using a composite acrylamide copolymer comprising (A) an anionic polysaccharide and (B) a cationic and/or amphoteric acrylamide copolymer.Type: ApplicationFiled: January 26, 2007Publication date: June 25, 2009Inventors: Katsumasa Ono, Koji Kutsuwa, Tomohiro Yokohara, Fuminari Nonomura, Masayuki Watanabe, Hiroshi Koyamoto, Akinobu Chatani, Yoshiharu Kimura, Takao Sezaki
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Publication number: 20090020250Abstract: There is provided a filled paper containing a coated filler obtained by coating a filler with a acrylamide copolymer (composite PAM) comprising (A) an anionic polysaccharide and (B) a cationic and/or an amphoteric acrylamide copolymer. The composite PAM is obtained, for example, by mixing the component (A) and the component (B). Since the filler is treated with a combination of the components (A) and (B) different from each other in charge properties and structure, suitable coagulation effect can be attained and the coated filler has excellent affinity for pulp slurry. Therefore, even in the case of a highly filled paper, a large paper strengthening effect can be attained by using a small amount of the chemical agent.Type: ApplicationFiled: March 16, 2006Publication date: January 22, 2009Inventors: Yoshiharu Kimura, Takao Sezaki, Yuko Iijima, Koji Kutsuwa
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Publication number: 20070221350Abstract: The present invention provides a low-density neutral paper offering excellent opacity, opacity after printing and other advantageous printability properties despite high bulk, by containing, as a filler, precipitated calcium carbonate-silica composite having an average particle size of 30 ?m or less and produced by neutralizing a mixture of precipitated calcium carbonate and alkaline silicate to pH 7 to 9, wherein the ratio of precipitated calcium carbonate to silica (precipitated calcium carbonate/silica) is 30/70 to 70/30 in solid content by weight and the surface of precipitated calcium carbonate particles is covered with silica. In particular, the present invention provides a low-density printing paper, or an electrophotographic transfer paper offering excellent stiffness and copier suitability, by means of adjusting the filler content in paper to a range of 1 to 25 solid content percent by weight, or provides a neutral newsprinting paper by means of adjusting the filler content in paper to a range of 0.Type: ApplicationFiled: March 15, 2005Publication date: September 27, 2007Inventors: Kazunari Soga, Dai Nagahara, Kazuyuki Fujita, Takashi Ochi, Koji Kutsuwa, Katsumasa Ono