Patents by Inventor Ryu Kitamura
Ryu Kitamura 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: 8771811Abstract: The present invention provides an ink-jet recording material containing: a support; and at least two ink-receiving layers of an ink-receiving underlayer and an ink-receiving top layer, the ink-receiving layers containing a pigment and a binder and being disposed on the support; characterized in that the ink-receiving top layer contains: a finely agglomerated pigment with an average particle diameter of 0.008 to 0.7 ?m, selected from the group consisting of a silica, an alumina, and an alumina hydrate; and a coarse-grained pigment with an average particle diameter of 1 to 30 ?m, the coarse-grained pigment being contained in an amount of 1 to 15 parts by mass with respect to 100 parts by mass of the finely agglomerated pigment.Type: GrantFiled: May 15, 2012Date of Patent: July 8, 2014Assignee: Oji Holdings CorporationInventors: Tomomi Takahashi, Ryu Kitamura, Takehiko Kishimoto, Hideo Mitsui, Shigeru Suzuki
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Publication number: 20120225223Abstract: The present invention provides an ink-jet recording material containing: a support; and at least two ink-receiving layers of an ink-receiving underlayer and an ink-receiving top layer, the ink-receiving layers containing a pigment and a binder and being disposed on the support; characterized in that the ink-receiving top layer contains: a finely agglomerated pigment with an average particle diameter of 0.008 to 0.7 ?m, selected from the group consisting of a silica, an alumina, and an alumina hydrate; and a coarse-grained pigment with an average particle diameter of 1 to 30 ?m, the coarse-grained pigment being contained in an amount of 1 to 15 parts by mass with respect to 100 parts by mass of the finely agglomerated pigment.Type: ApplicationFiled: May 15, 2012Publication date: September 6, 2012Applicant: OJI PAPER CO., LTD.Inventors: Tomomi TAKAHASHI, Ryu KITAMURA, Takehiko KISHIMOTO, Hideo MITSUI, Shigeru SUZUKI
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Patent number: 8202586Abstract: The present invention provides an ink-jet recording material containing: a support; and at least two ink-receiving layers of an ink-receiving underlayer and an ink-receiving top layer, the ink-receiving layers containing a pigment and a binder and being disposed on the support; characterized in that the ink-receiving top layer contains: a finely agglomerated pigment with an average particle diameter of 0.008 to 0.7 ?m, selected from the group consisting of a silica, an alumina, and an alumina hydrate; and a coarse-grained pigment with an average particle diameter of 1 to 30 ?m, the coarse-grained pigment being contained in an amount of 1 to 15 parts by mass with respect to 100 parts by mass of the finely agglomerated pigment.Type: GrantFiled: January 26, 2006Date of Patent: June 19, 2012Assignee: Oji Paper Co., Ltd.Inventors: Tomomi Takahashi, Ryu Kitamura, Takehiko Kishimoto, Hideo Mitsui, Shigeru Suzuki
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Publication number: 20090136692Abstract: The present invention provides an ink-jet recording material containing: a support; and at least two ink-receiving layers of an ink-receiving underlayer and an ink-receiving top layer, the ink-receiving layers containing a pigment and a binder and being disposed on the support; characterized in that the ink-receiving top layer contains: a finely agglomerated pigment with an average particle diameter of 0.008 to 0.7 ?m, selected from the group consisting of a silica, an alumina, and an alumina hydrate; and a coarse-grained pigment with an average particle diameter of 1 to 30 ?m, the coarse-grained pigment being contained in an amount of 1 to 15 parts by mass with respect to 100 parts by mass of the finely agglomerated pigment.Type: ApplicationFiled: January 26, 2006Publication date: May 28, 2009Applicant: Oji Paper C., Ltd.Inventors: Tomomi Takahashi, Ryu Kitamura, Takehiko Kishimoto, Hideo Mitsui, Shigeru Suzuki
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Publication number: 20080044601Abstract: Ink jet printing paper capable of providing, by using a low permeability or a nonpermeable supporting sheet, a high surface glossiness and a high dot reproducibility of a silver halide photograph level, an excellent absorptivity of ink, and a high recording density, and preventing cockling by ink solvent, comprising the low permeability or the nonpermeable supporting sheet, at least one ink receiving layer coated on the supporting sheet, and a luster layer coated on the ink receiving layer, the ink receiving layer in contact with the luster layer comprising pigment, as a main component, having a specific surface area-based mode diameter of pore distribution of 100 nm or less and an average secondary particle size of 1.3 ?m or less, and the luster layer comprising pigment, as a main component, having an average primary particle size of 5 to 100 nm.Type: ApplicationFiled: October 23, 2007Publication date: February 21, 2008Applicant: Oji Paper Co., Ltd.Inventors: Shinichi Asano, Motoko Hiraki, Tomomi Takahashi, Hiromasa Kondo, Takeshi Iida, Ryu Kitamura
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Patent number: 7303651Abstract: Ink jet printing paper capable of providing, by using a low permeablity or a nonpermeable supporting sheet, a high surface glossiness and a high dot reproducibility of a silver halide photograph level, an excellent absorptivity of ink, and a high recording density, and preventing cockling by ink solvent, comprising the low permeablity or the nonpermeable supporting sheet, at least one ink receiving layer coated on the supporting sheet, and a luster layer coated on the ink receiving layer, the ink receiving layer in contact with the luster layer comprising pigment, as a main component, having a specific surface area-based mode diameter of pore distribution of 100 nm or less and an average secondary particle size of 1.3 ?m or less, and the luster layer comprising pigment, as a main component, having an average primary particle size of 5 to 100 nm.Type: GrantFiled: November 8, 2002Date of Patent: December 4, 2007Assignee: Oji Paper Co., Ltd.Inventors: Shinichi Asano, Motoko Hiraki, Tomomi Takahashi, Hiromasa Kondo, Takeshi Iida, Ryu Kitamura
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Publication number: 20070202263Abstract: A process for producing a coated sheet, in which there can be formed a coating layer simultaneously attaining an ink absorption rate and coating film cracking control suitable for use as an inkjet recording layer, in particular, there can be realized high gloss, high ink absorption, high printing density and high image quality required for use as a glossy inkjet recording sheet. There is provided a process for producing a coated sheet, comprising coating a support, or undercoat layer superimposed on the support, with a coating liquid containing a thermosensitive polymeric compound reversibly exhibiting hydrophilicity and hydrophobicity depending on temperature change, characterized in that the coating liquid containing a thermosensitive polymeric compound is applied concurrently with application of a treatment liquid whose temperature is in the range in which the thermosensitive polymeric compound exhibits hydrophilicity, or after the application of the treatment liquid without drying after the application.Type: ApplicationFiled: February 24, 2005Publication date: August 30, 2007Inventors: Ryu Kitamura, Kazuyoshi Wakata, Yasuto Tai, Motoko Hiraki, Shinichi Asano
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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: 20040261964Abstract: Ink jet printing paper capable of providing, by using a low permeablity or a nonpermeable supporting sheet, a high surface glossiness and a high dot reproducibility of a silver halide photograph level, an excellent absorptivity of ink, and a high recording density, and preventing cockling by ink solvent, comprising the low permeablity or the nonpermeable supporting sheet, at least one ink receiving layer coated on the supporting sheet, and a luster layer coated on the ink receiving layer, the ink receiving layer in contact with the luster layer comprising pigment, as a main component, having a specific surface area-based mode diameter of pore distribution of 100 nm or less and an average secondary particle size of 1.3 &mgr;m or less, and the luster layer comprising pigment, as a main component, having an average primary particle size of 5 to 100 nm.Type: ApplicationFiled: May 5, 2004Publication date: December 30, 2004Inventors: Shinichi Asano, Motoko Hiraki, Tomomi Takahashi, Hiromasa Kondo, Takeshi Iida, Ryu Kitamura
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Publication number: 20040151894Abstract: An aqueous dispersion of inorganic pigment-cationic resin composite fine particles, having a high dispersing property and a high dispersion stability, contains agglomerate particles of a cationic resin which has cationic polymerization units having a five-membered cyclic amidine structure of the formula (1), with inorganic pigment particles having an average primary particle size of 3 to 40 nm, the agglomerate particles having an average secondary particle size controlled to from 10 nm to 1.0 &mgr;m.Type: ApplicationFiled: September 5, 2003Publication date: August 5, 2004Applicant: OJI PAPER CO., LTD.Inventors: Kumiko Kado, Ryu Kitamura
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Patent number: 6713160Abstract: An ink jet recording material which enables the recorded ink images to exhibit enhanced light fastness, water resistance and hot moisture resistance, includes an ink receiving layer formed on a support material and containing a light fastness-enhancing agent containing hydroquinone-&bgr;-D-glucoside, a salt of pyrocatechol-3,5-disulfonic acid and/or salt of p-hydroxybenzenesulfonic acid, and an inorganic pigment and a cationic polymeric material which are in the form of a plurality of composite particles prepared by mixing an aqueous dispersion of inorganic pigment particles with a cationic polymeric material having a molecular weight of 100,000 or more, to cause the aqueous dispersion of the inorganic pigment particles to be coagulated with the cationic polymeric material, and subjecting the resultant coagulate of the inorganic pigment with the cationic polymeric material to pulverization to form inorganic pigment-cationic polymeric material composite particles having an average composite particle size of 10Type: GrantFiled: December 2, 2002Date of Patent: March 30, 2004Assignee: Oji Paper Co., Ltd.Inventors: Ryu Kitamura, Eriko Endo, Tomomi Takahashi, Kazuaki Ohshima
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Patent number: 6689432Abstract: An ink jet recording material having excellent smoothness and gloss and capable of recording thereon ink images having high color density clarity, water resistance and sharpness comparative to the silver salt photographic images has a recording stratum formed on a substrate and comprising a single ink receiving layer or a plurality of ink receiving layers superposed on each other and containing a pigment and a binder, at least one ink receiving layer containing fine particles of at least one pigment selected from silica, aluminosilicate, and &agr;-, &thgr;-, &dgr;- and &ggr;-aluminas and having an average particle size of 1 &mgr;m or less and optionally a light resistance-enhancing agent for images including at least one of phenolic compounds, boric acid, borate salts and cyclodextrin compounds.Type: GrantFiled: January 26, 2001Date of Patent: February 10, 2004Assignee: Oji Paper Co., Ltd.Inventors: Ryu Kitamura, Tomomi Takahashi, Eriko Endo, Kazuaki Ohshima, Shunichiro Mukoyoshi, Tetsuo Tsuchida
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Publication number: 20030134093Abstract: An ink jet recording material which enables the recorded ink images to exhibit enhanced light fastness, water resistance and hot moisture resistance, includes an ink receiving layer formed on a support material and containing a light fastness-enhancing agent containing hydroquinone-&bgr;-D-glucoside, a salt of pyrocatechol-3,5-disulfonic acid and/or salt of p-hydroxybenzenesulfonic acid, and an inorganic pigment and a cationic polymeric material which are in the form of a plurality of composite particles prepared by mixing an aqueous dispersion of inorganic pigment particles with a cationic polymeric material having a molecular weight of 100,000 or more, to cause the aqueous dispersion of the inorganic pigment particles to be coagulated with the cationic polymeric material, and subjecting the resultant coagulate of the inorganic pigment with the cationic polymeric material to pulverization to form inorganic pigment-cationic polymeric material composite particles having an average composite particle size of 10Type: ApplicationFiled: December 2, 2002Publication date: July 17, 2003Inventors: Ryu Kitamura, Eriko Endo, Tomomi Takahashi, Kazuaki Ohshima
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Patent number: 6465086Abstract: An ink jet recording material having high gloss, a good ink-absorbing property, and high color density of the ink image includes at least one underrecording layer and at least one upper recording layer formed on a support and each containing fine pigment particles having an average primary particle size of 3 to 40 nm and an average secondary particle size of 10 to 400 nm, the pigment particles in the underrecording layer having a larger primary particle size than those in the upperrecording layer.Type: GrantFiled: May 13, 1998Date of Patent: October 15, 2002Assignee: Oji Paper Co., Ltd.Inventors: Ryu Kitamura, Tomomi Takahashi, Shunichiro Mukoyoshi
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Patent number: 6436513Abstract: An ink jet recording material having an excellent ink absorbing property and capable of recording ink images with superior gloss, water resistance and light resistance has an outermost ink receiving layer formed on a support and containing (1) fine pigment particles selected from amorphous silica secondary particles and alumina silicate secondary particles which have an average secondary particle size of 10 to 300 nm and in each of which a plurality of primary particles having an average primary particle size of 3 to 40 nm are agglomerated with each other, (2) an ultraviolet ray absorber and, optionally, (3) an antioxidant.Type: GrantFiled: September 15, 1998Date of Patent: August 20, 2002Assignee: Oji Paper Co., Ltd.Inventors: Ryu Kitamura, Tomomi Takahashi, Shunichiro Mukoyoshi, Kazuaki Ohshima
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Publication number: 20020022117Abstract: An ink jet recording material having an excellent ink absorbing property and capable of recording ink images with superior gloss, water resistance and light resistance has an outermost ink receiving layer formed on a support and containing (1) fine pigment particles selected from amorphous silica secondary particles and alumina silicate secondary particles which have an average secondary particle size of 10 to 300 nm and in each of which a plurality of primary particles having an average primary particle size of 3 to 40 nm are agglomerated with each other, (2) an ultraviolet ray absorber and, optionally, (3) an antioxidant.Type: ApplicationFiled: September 15, 1998Publication date: February 21, 2002Inventors: RYU KITAMURA, TOMOMI TAKAHASHI, SHUNICHIRO MUKOYOSHI, KAZUAKI OHSHIMA
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Publication number: 20010016249Abstract: An ink jet recording material having excellent smoothness and gloss and capable of recording thereon ink images having high color density clarity, water resistance and sharpness comparative to the silver salt photographic images has a recording stratum formed on a substrate and comprising a single ink receiving layer or a plurality of ink receiving layers superposed on each other and containing a pigment and a binder, at least one ink receiving layer containing fine particles of at least one pigment selected from silica, aluminosilicate, and &agr;-, &thgr;-, &dgr;- and &ggr;-aluminas and having an average particle size of 1 &mgr;m or less and optionally a light resistance-enhancing agent for images including at least one of phenolic compounds, boric acid, borate salts and cyclodextrin compounds.Type: ApplicationFiled: January 26, 2001Publication date: August 23, 2001Applicant: OJI PAPER CO., LTD.Inventors: Ryu Kitamura, Tomomi Takahashi, Eriko Endo, Kazuaki Ohshima, Shunichiro Mukoyoshi, Tetsuo Tsuchida