Patents by Inventor Hirokazu Sunagawa
Hirokazu Sunagawa 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: 20240141591Abstract: Provided are: a sheet which has high transparency, in which yellowing due to heating is suppressed, and which has high tensile elastic modulus and excellent flexibility; and a layered body having the sheet. The sheet of the present invention contains ultrafine fibrous cellulose having a fiber width of 10 nm or less, and a cellulose derivative having a weight-average molecular weight of 1.0×104 or more and 3.0×105 or less.Type: ApplicationFiled: February 3, 2022Publication date: May 2, 2024Applicant: OJI HOLDINGS CORPORATIONInventors: Rina SHISHIDO, Yuichi NOGUCHI, Hirokazu SUNAGAWA
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Patent number: 11591481Abstract: It is an object of the present invention to provide a cellulose-containing composition having excellent coating suitability, a production method thereof, and a film. According to the present invention, provided is a cellulose-containing composition comprising cellulose fibers having a fiber width of 1000 nm or less and protein, wherein the protein includes an enzyme, the content of the protein is 1×10?3 parts by mass or less with respect to 1 part by mass of the cellulose fibers, and when the cellulose-containing composition having a solid concentration of 0.4% by mass is obtained, the viscosity of the cellulose-containing composition measured under conditions of 25° C. and a rotation number of 3 rpm is 10 mPa·s or more and 11000 mPa·s or less.Type: GrantFiled: July 13, 2018Date of Patent: February 28, 2023Assignee: OJI HOLDINGS CORPORATIONInventors: Moe Mizukami, Hayato Fushimi, Hirokazu Sunagawa
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Patent number: 11447612Abstract: The purpose of the present invention is to provide a composite sheet in which the dimension stability when it is tensed is high and the appearance deterioration and the yellowness change are suppressed. The present invention relates to a sheet comprising; cellulose fibers having a fiber width of 1000 nm or less and having a phosphoric acid group or a phosphoric acid group-derived substituent; and a polyvinyl alcohol-based resin, wherein the sheet has a tensile elastic modulus of 3.4 GPa or more.Type: GrantFiled: July 7, 2017Date of Patent: September 20, 2022Assignee: OJI HOLDINGS CORPORATIONInventors: Koh Sakai, Hayato Fushimi, Hirokazu Sunagawa
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Patent number: 11426763Abstract: An object of the present invention is to provide a laminate having a fiber layer comprising ultrafine cellulose fibers and a resin layer, wherein the two layers have more excellent adhesion properties. The present invention relates to a laminate having at least one fiber layer comprising cellulose fibers with a fiber width of 1000 nm or less, and at least one resin layer that is contacted with one surface of the fiber layer, wherein the resin layer has an adhesion aid.Type: GrantFiled: January 13, 2017Date of Patent: August 30, 2022Assignee: OJI HOLDINGS CORPORATIONInventors: Hayato Fushimi, Hirokazu Sunagawa
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Patent number: 11346053Abstract: It is an object of the present invention is to provide a sheet containing ultrafine cellulose fibers, which is excellent in transparency and water resistance. The present invention relates to a sheet including cellulose fibers having a fiber width of 1000 nm or less, and polyamine polyamide epihalohydrin, wherein the haze of the sheet is 6% or less.Type: GrantFiled: February 9, 2017Date of Patent: May 31, 2022Assignee: OJI HOLDINGS CORPORATONInventors: Koh Sakai, Go Banzashi, Hirokazu Sunagawa, Hayato Fushimi
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Publication number: 20210395494Abstract: Provided are a fine fibrous cellulose-containing composition, and a method for manufacturing the same, which are capable of reducing the viscosity of a fine fibrous cellulose dispersion liquid without changing the concentration of fine fibrous cellulose. The fine fibrous cellulose-containing composition contains fine fibrous cellulose having a fiber width of 1,000 nm or less, an enzyme-derived protein, and a protease or a chlorine-containing oxo acid or a salt thereof.Type: ApplicationFiled: October 25, 2019Publication date: December 23, 2021Applicant: OJI HOLDINGS CORPORATIONInventors: Moe MIZUKAMI, Hayato FUSHIMI, Hirokazu SUNAGAWA
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Publication number: 20210301095Abstract: The purpose of the present invention is to provide a composite sheet in which the dimension stability when it is tensed is high and the appearance deterioration and the yellowness change are suppressed. The present invention relates to a sheet comprising; cellulose fibers having a fiber width of 1000 nm or less and having a phosphoric acid group or a phosphoric acid group-derived substituent; and a polyvinyl alcohol-based resin, wherein the sheet has a tensile elastic modulus of 3.4 GPa or more.Type: ApplicationFiled: July 7, 2017Publication date: September 30, 2021Applicant: Oji Holdings CorporationInventors: Koh SAKAI, Hayato FUSHIMI, Hirokazu SUNAGAWA
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Publication number: 20210222366Abstract: It is an object of the present invention to provide a composition comprising cellulose fibers having a fiber width of 1000 nm or less, the properties of which are maintained even after long-term storage.Type: ApplicationFiled: August 7, 2017Publication date: July 22, 2021Applicant: Oji Holdings CorporationInventors: Rina TANAKA, Koh SAKAI, Hirokazu SUNAGAWA
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Patent number: 11065850Abstract: It is an object of the present invention to provide a laminate excellent in interlayer adhesion properties. The present invention relates to a laminate comprising: a fiber layer formed of cellulose fibers having a fiber width of 1000 nm or less; a resin layer; and an adhesive layer provided between the fiber layer and the resin layer.Type: GrantFiled: September 14, 2016Date of Patent: July 20, 2021Assignee: OJI HOLDINGS CORPORATIONInventors: Hirokazu Sunagawa, Hayato Fushimi, Go Banzashi
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Publication number: 20210207326Abstract: An object of the present invention is to provide a laminate having a fiber layer comprising ultrafine cellulose fibers and a resin layer, wherein the two layers have more excellent adhesion properties. The present invention relates to a laminate having at least one fiber layer comprising cellulose fibers with a fiber width of 1000 nm or less, and at least one resin layer that is contacted with one surface of the fiber layer, wherein the resin layer has an adhesion aid.Type: ApplicationFiled: January 13, 2017Publication date: July 8, 2021Applicant: OJI HOLDINGS CORPORATIONInventors: Hayato FUSHIMI, Hirokazu SUNAGAWA
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Publication number: 20210122932Abstract: It is an object of the present invention to provide a cellulose-containing composition having excellent coating suitability, a production method thereof, and a film. According to the present invention, provided is a cellulose-containing composition comprising cellulose fibers having a fiber width of 1000 nm or less and protein, wherein the protein includes an enzyme, the content of the protein is 1×10?3 parts by mass or less with respect to 1 part by mass of the cellulose fibers, and when the cellulose-containing composition having a solid concentration of 0.4% by mass is obtained, the viscosity of the cellulose-containing composition measured under conditions of 25° C. and a rotation number of 3 rpm is 10 mPa·s or more and 11000 mPa·s or less.Type: ApplicationFiled: July 13, 2018Publication date: April 29, 2021Applicant: OJI HOLDINGS CORPORATIONInventors: Moe MIZUKAMI, Hayato FUSHIMI, Hirokazu SUNAGAWA
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Patent number: 10808361Abstract: It is an object of the present invention to provide a composite sheet, which achieves all of water repellency, water resistance, transparency and mechanical strength. The present invention relates to a sheet having a fiber layer and a coating layer on the fiber layer, wherein the fiber layer comprises ultrafine cellulose fibers having a fiber width of 1000 nm or less in an amount of 60% by mass or more, the haze of the sheet is 20% or less, and the water contact angle of the surface of the sheet on the side of the coating layer which is measured 30 seconds after completion of the dropping of distilled water is 70 degrees or more.Type: GrantFiled: November 25, 2016Date of Patent: October 20, 2020Assignee: OJI HOLDINGS CORPORATIONInventors: Hirokazu Sunagawa, Koh Sakai, Hayato Fushimi, Go Banzashi
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Publication number: 20190359795Abstract: The purpose of the present invention is to provide a sheet in which generation of cracks is suppressed when it is bent. The present invention relates to a sheet comprising pulp-derived cellulose fibers having a fiber width of 1000 nm or less and a polyvinyl alcohol-based resin, wherein the sheet has a tensile strength of 15 MPa or more.Type: ApplicationFiled: July 7, 2017Publication date: November 28, 2019Applicant: Oji Holdings CorporationInventors: Koh SAKAI, Hayato FUSHIMI, Hirokazu SUNAGAWA
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Publication number: 20190055697Abstract: It is an object of the present invention is to provide a sheet containing ultrafine cellulose fibers, which is excellent in transparency and water resistance. The present invention relates to a sheet including cellulose fibers having a fiber width of 1000 nm or less, and polyamine polyamide epihalohydrin, wherein the haze of the sheet is 6% or less.Type: ApplicationFiled: February 9, 2017Publication date: February 21, 2019Applicant: OJI HOLDINGS CORPORATIONInventors: Koh SAKAI, Go BANZASHI, Hirokazu SUNAGAWA, Hayato FUSHIMI
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Publication number: 20180371696Abstract: It is an object of the present invention to provide a composite sheet, which achieves all of water repellency, water resistance, transparency and mechanical strength. The present invention relates to a sheet having a fiber layer and a coating layer on the fiber layer, wherein the fiber layer comprises ultrafine cellulose fibers having a fiber width of 1000 nm or less in an amount of 60% by mass or more, the haze of the sheet is 20% or less, and the water contact angle of the surface of the sheet on the side of the coating layer which is measured 30 seconds after completion of the dropping of distilled water is 70 degrees or more.Type: ApplicationFiled: November 25, 2016Publication date: December 27, 2018Applicant: OJI HOLDINGS CORPORATIONInventors: Hirokazu SUNAGAWA, Koh SAKAI, Hayato FUSHIMI, Go BANZASHI
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Publication number: 20180347117Abstract: An object of the present invention is to provide an ultrafine cellulose fiber-containing sheet, in which generation of warp (curl) is suppressed. The present invention relates to a laminated sheet having two or more layers of sheet comprising ultrafine cellulose fibers with a fiber width of 1000 nm or less, wherein among two or more layers of the sheet, when the thickness (?m) of the thickest sheet is defined as Tmax and the thickness (?m) of the thinnest sheet is defined as Tmin, the value of Tmax/Tmin is 3 or less, and the thickness of a single layer of the sheet is 15 ?m or more.Type: ApplicationFiled: October 25, 2016Publication date: December 6, 2018Applicant: OJI HOLDINGS CORPORATIONInventors: Hayato FUSHIMI, Hirokazu SUNAGAWA, Go BANZASHI
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Publication number: 20180264788Abstract: It is an object of the present invention to provide a laminate excellent in interlayer adhesion properties. The present invention relates to a laminate comprising: a fiber layer formed of cellulose fibers having a fiber width of 1000 nm or less; a resin layer; and an adhesive layer provided between the fiber layer and the resin layer.Type: ApplicationFiled: September 14, 2016Publication date: September 20, 2018Applicant: OJI HOLDINGS CORPORATIONInventors: Hirokazu SUNAGAWA, Hayato FUSHIMI, Go BANZASHI
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Publication number: 20060088672Abstract: The present invention relates to an ink jet recording sheet comprising: a supporting medium; and an ink receiving layer formed on the supporting medium, wherein the ink receiving layer comprises a pigment, an adhesive agent, an ink fixing agent, and a ternary copolymer comprising an alkyl (meth)acrylate, an N-methylolacrylamide, and a styrene.Type: ApplicationFiled: October 25, 2005Publication date: April 27, 2006Inventors: Kazuo Totani, Hirokazu Sunagawa, Satoshi Matsuura, Naho Kinoshita
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Publication number: 20060045998Abstract: An ink jet recording material having excellent ink-absorption and appropriate for high speed recording has an ink receiving layer formed on a substrate material and including a first coating layer formed on the substrate material and including a pigment (for example, wet process silica fine particles) and a binder; a second coating layer formed on the first coating layer and including a pigment (for example, gas phase process silica or alumina) and a binder; and a third coating layer formed on the second coating layer and including a pigment containing colloidal particles, and alumina and/or pseudo boehmite fine particles.Type: ApplicationFiled: November 21, 2003Publication date: March 2, 2006Inventors: Ryu Kitamura, Hirokazu Sunagawa, Mitsuru Kobayashi
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Publication number: 20050221024Abstract: Ink jet recording sheet has excellent coating strength, print water resistance, print concentration, ink absorptivity, and white paper portion preservability, and possesses excellent coloring properties for dye ink as well as pigment ink. The ink jet recording sheet includes: a supporting medium; and an ink receiving layer disposed on the supporting medium, the ink receiving layer including, at least: pigment; an adhesive; and an ink fixing agent, wherein the ink fixing agent includes at least one compound selected from the group consisting of zinc chloride, zinc sulfite, magnesium chloride and magnesium sulfate, in combination with a guanidine compound.Type: ApplicationFiled: February 18, 2005Publication date: October 6, 2005Inventors: Rie Teshima, Hirokazu Sunagawa, Satoshi Matsuura, Kazuo Totani