Patents by Inventor Ryozo Akiyama
Ryozo Akiyama 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: 20080273066Abstract: An ink jet recording apparatus comprising a color ink container having a capacity V1 accommodating therein a solvent polymerizable in the presence of an acid and a colorant, a reaction liquid container having a capacity V2 (V2<V1) accommodating therein a reaction liquid comprising a solvent, and a photo-acid generating agent capable of generating an acid when irradiated with light, a stirring container mixing the color ink and the reaction liquid at a mixing ratio of S1:S2 (the color ink:the reaction liquid) to prepare a recording ink, a color ink supply means feeding the color ink to the stirring container, a reaction liquid supply means feeding the reaction liquid to the stirring container, an ink jet recording head ejecting the recording ink to a recording medium, and a supply tube feeding the recording ink to the recording head.Type: ApplicationFiled: June 5, 2008Publication date: November 6, 2008Applicants: TOSHIBA TEC KABUSHIKI KAISHA, KABUSHIKI KAISHA TOSHIBAInventors: Masashi Hiroki, Kazuhiko Ohtsu, Yoshito Endo, Toro Ushirogouchi, Ryozo Akiyama
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Patent number: 7439281Abstract: There is provided a pigment dispersion comprising at least one resin-coated pigment comprising a resin and a pigment, and having an average particle diameter of 250 nm or less, and a dispersion medium containing as a major component a cation polymeric compound having a viscosity of 30 mPa.s or less at a temperature of 25° C. and a boiling point of 150° C. or more at 1 atm. The pigment is incorporated in the pigment dispersion at a ratio ranging from 3 to 41% by weight based on a total weight of the dispersion medium, and the resin is incorporated in the resin-coated pigment at a ratio ranging from 5 to 37% by weight based on the weight of the pigment.Type: GrantFiled: October 20, 2004Date of Patent: October 21, 2008Assignee: Toshiba Tec Kabushiki KaishaInventors: Toru Ushirogouchi, Ryozo Akiyama, Kazuhiko Ohtsu, Masashi Hiroki, Mitsuru Ishibashi
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Patent number: 7425525Abstract: There is proposed a washing solution for washing an inkjet printer head which performs printing by feeding an ink comprising at least two kinds of polymerizable compounds each differing in viscosity, a photopolymerization initiator, and pigment. This washing solution is characterized in that it contains not less than 50 parts by weight of a polymerizable compound selected from the polymerizable compounds included in the ink and having a lowest viscosity among the polymerizable compounds, or not less than 50 parts by weight of a polymerizable compound having a viscosity of 30 mPa·sec or less at ordinary temperature.Type: GrantFiled: February 23, 2005Date of Patent: September 16, 2008Assignee: Toshiba Tec Kabushiki KaishaInventors: Ryozo Akiyama, Toru Ushirogouchi, Mitsuru Ishibashi, Kazuhiko Ohtsu, Masashi Hiroki
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Patent number: 7417074Abstract: There is disclosed an ink jet recording apparatus comprising a color ink container having a capacity V1 accommodating therein a solvent polymerizable in the presence of an acid and a colorant, a reaction liquid container having a capacity V2 (V2<V1) accommodating therein a reaction liquid comprising a solvent, and a photo-acid generating agent capable of generating an acid when irradiated with light, an stirring container mixing the color ink and the reaction liquid at a mixing ratio of S1:S2 (the color ink:the reaction liquid) to prepare a recording ink, a color ink supply means feeding the color ink to the stirring container, a reaction liquid supply means feeding the reaction liquid to the stirring container, an ink jet recording head ejecting the recording ink to a recording medium, and a supply tube feeding the recording ink to the recording head.Type: GrantFiled: March 22, 2004Date of Patent: August 26, 2008Assignees: Toshiba Tec Kabushiki Kaisha, Kabushiki Kaisha ToshibaInventors: Masashi Hiroki, Kazuhiko Ohtsu, Yoshito Endo, Toru Ushirogouchi, Ryozo Akiyama
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Patent number: 7404852Abstract: An inkjet ink is provided, which includes a solvent and a pigment having an average particle diameter of not larger than 250 nm. The number of flocculates of pigment particles having a diameter of 1 ?m or more is 1.6×108/cm3 or less.Type: GrantFiled: September 14, 2006Date of Patent: July 29, 2008Assignee: Toshiba Tec Kabushiki KaishaInventors: Mitsuru Ishibashi, Toru Ushirogochi, Kazuhiko Ohtsu, Ryozo Akiyama, Masashi Hiroki
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Patent number: 7387380Abstract: There is disclosed a liquid ink including a photo acid generating agent that generates an acid upon irradiation with light, a coloring component, and at least one kind of a solvent that is polymerized in the presence of an acid. It is preferable that the amount of the photo acid generating agent contained in the liquid ink falls within a range of between 1 part by weight and 10 parts by weight relative to 100 parts by weight of the solvent, the coloring component consists of a pigment, and the solvent contains at least 50 parts by weight of an acid polymerizable compound, the acid polymerizing compound polymerizing in the presence of the acid, having an alicyclic skeleton and/or an aliphatic skeleton having a viscosity of 50 mPa·s or less and a boiling point of 150° C. or more under room temperature and atmospheric pressure.Type: GrantFiled: August 11, 2006Date of Patent: June 17, 2008Assignees: Toshiba Tec Kabushiki Kaisha, Kabushiki Kaisha ToshibaInventors: Toru Ushirogouchi, Chiaki Tanuma, Kazuhiko Ohtsu, Ryozo Akiyama, Masashi Hiroki, Yoshito Endo
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Patent number: 7375145Abstract: There is provided an inkjet ink comprising a photo-acid generating agent which is capable of generating an acid as it is irradiated with light, a color component, and an acid-polymerizable compound which can be polymerized in the presence of an acid, wherein at least 40% of the acid-polymerizable solvent is a vinyl ether compound represented by the following general formula (1): R13—R14—(R13)p ??(1) (Wherein R13(s) is a group selected from the group consisting of a vinyl ether group, a group having a vinyl ether skeleton, an alkoxy group, substituted hydroxyl group and hydroxyl group wherein at least one of R13(s) is vinyl ether group or a group having a vinyl ether skeleton, R14 is a group comprising a substituted or unsubstituted cyclic skeleton and having a valence of (p+1), and p is a positive integer including zero).Type: GrantFiled: October 20, 2004Date of Patent: May 20, 2008Assignee: Toshiba Tec Kabushiki KaishaInventors: Ryozo Akiyama, Toru Ushirogouchi, Kazuhiko Ohtsu, Mitsuru Ishibashi, Hiroshi Kiyomoto, Yukiko Kawakami
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Publication number: 20070270520Abstract: There is provided an inkjet ink comprising a photo-acid generating agent which is capable of generating an acid as it is irradiated with light, a color component, and an acid-polymerizable compound which can be polymerized in the presence of an acid, wherein at least 40% of the acid-polymerizable solvent is a vinyl ether compound represented by the following general formula (1): R13—R14—(R13)p (wherein R13(s) is a group selected from the group consisting of a vinyl ether group, a group having a vinyl ether skeleton, an alkoxy group, substituted hydroxyl group and hydroxyl group wherein at least one of R13(s) is vinyl ether group or a group having a vinyl ether skeleton, R14 is a group comprising a substituted or unsubstituted cyclic skeleton and having a valence of (p+1), and p is a positive integer including zero).Type: ApplicationFiled: December 7, 2006Publication date: November 22, 2007Inventors: Ryozo Akiyama, Toru Ushirogouchi, Kazuhiko Ohtsu, Mitsuru Ishibashi, Hiroshi Kiyomoto, Yukiko Kawakami
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Patent number: 7285581Abstract: There is disclosed a processed pigment comprising a pigment having a dispersing agent adsorbed physically and/or chemically onto part of the surface of the pigment, and a cationic polymerizable compound bonded through a covalent bond to the surface of the pigment. Preferably, the cationic polymerizable compound is formed of an alicyclic epoxy compound.Type: GrantFiled: February 24, 2004Date of Patent: October 23, 2007Assignee: Toshiba Tec Kabushiki KaishaInventors: Ryozo Akiyama, Toru Ushirogouchi, Kazuhiko Ohtsu
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Publication number: 20070202437Abstract: A photosensitive composition is provided, which includes a cationic photopolymerization initiator, and an organic dispersion medium containing at least two kinds of polymerizable compounds selected from the group consisting of an oxetane compound and a vinyl ether compound represented by the following general formula (1), at least one of the polymerizable compounds being a monofunctional compound: R11—R12—(R11)p ??(1) wherein R11s are individually a group selected from the group consisting of a vinyl ether group, a vinyl ether skeleton-bearing group, an alkoxy group, a substituted hydroxyl group and hydroxyl group, at least one of R11s being a vinyl ether group or a vinyl ether skeleton-bearing group, R12 is a (p+1)-valent group having a substituted or unsubstituted cyclic skeleton or aliphatic skeleton, and p is a positive integer including zero.Type: ApplicationFiled: February 8, 2007Publication date: August 30, 2007Inventors: Mitsuru Ishibashi, Toru Ushirogouchi, Hiroshi Kiyomoto, Ryozo Akiyama, Yukiko Kawakami, Kazuhiko Ohtsu
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Publication number: 20070185224Abstract: A photosensitive inkjet ink is provided, which includes a photo-acid generating agent, pigment, and an organic dispersion medium containing at least two kinds of polymerizable compounds selected from the group consisting of an oxetane compound and a vinyl ether compound, at least one kind of the polymerizable compounds being a monofunctional compound at a concentration of 20 to 70% based on a total weight of the organic dispersion medium, and the vinyl ether compound at a concentration of 30% or more based on a total weight of the organic dispersion medium. The vinyl ether compound is selected from the following chemical formula.Type: ApplicationFiled: February 8, 2007Publication date: August 9, 2007Inventors: Ryozo Akiyama, Hiroshi Kiyomoto, Yukiko Kawakami, Kazuhiko Ohtsu, Toru Ushirogouchi, Mitsuru Ishibashi
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Publication number: 20070101898Abstract: There is provided an inkjet ink comprising a photo-acid generating agent which is capable of generating an acid as it is irradiated with light, a color component, and an acid-polymerizable compound which can be polymerized in the presence of an acid, wherein at least 40% of the acid-polymerizable solvent is a vinyl ether compound represented by the following general formula (1): R13—R14—(R13)p??(1) (Wherein R13(s) is a group selected from the group consisting of a vinyl ether group, a group having a vinyl ether skeleton, an alkoxy group, substituted hydroxyl group and hydroxyl group wherein at least one of R13(s) is vinyl ether group or a group having a vinyl ether skeleton, R14 is a group comprising a substituted or unsubstituted cyclic skeleton and having a valence of (p+1), and p is a positive integer including zero).Type: ApplicationFiled: December 7, 2006Publication date: May 10, 2007Inventors: Ryozo Akiyama, Toru Ushirogouchi, Kazuhiko Ohtsu, Mitsuru Ishibashi, Hiroshi Kiyomoto, Yukiko Kawakami
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Publication number: 20070006773Abstract: An inkjet ink is provided, which includes a solvent and a pigment having an average particle diameter of not larger than 250 nm. The number of flocculates of pigment particles having a diameter of 1 ?m or more is 1.6×108/cm3 or less.Type: ApplicationFiled: September 14, 2006Publication date: January 11, 2007Inventors: Mitsuru Ishibashi, Toru Ushirogochi, Kazuhiko Ohtsu, Ryozo Akiyama, Masashi Hiroki
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Publication number: 20060274135Abstract: There is disclosed a liquid ink including a photo acid generating agent that generates an acid upon irradiation with light, a coloring component, and at least one kind of a solvent that is polymerized in the presence of an acid. It is preferable that the amount of the photo acid generating agent contained in the liquid ink falls within a range of between 1 part by weight and 10 parts by weight relative to 100 parts by weight of the solvent, the coloring component consists of a pigment, and the solvent contains at least 50 parts by weight of an acid polymerizable compound, the acid polymerizing compound polymerizing in the presence of the acid, having an alicyclic skeleton and/or an aliphatic skeleton having a viscosity of 50 mPa·s or less and a boiling point of 150° C. or more under room temperature and atmospheric pressure.Type: ApplicationFiled: August 11, 2006Publication date: December 7, 2006Inventors: Toru Ushirogouchi, Chiaki Tanuma, Kazuhiko Ohtsu, Ryozo Akiyama, Masashi Hiroki, Yoshito Endo
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Publication number: 20060274136Abstract: There is disclosed a liquid ink including a photo acid generating agent that generates an acid upon irradiation with light, a coloring component, and at least one kind of a solvent that is polymerized in the presence of an acid. It is preferable that the amount of the photo acid generating agent contained in the liquid ink falls within a range of between 1 part by weight and 10 parts by weight relative to 100 parts by weight of the solvent, the coloring component consists of a pigment, and the solvent contains at least 50 parts by weight of an acid polymerizable compound, the acid polymerizing compound polymerizing in the presence of the acid, having an alicyclic skeleton and/or an aliphatic skeleton having a viscosity of 50 mPa·s or less and a boiling point of 150° C. or more under room temperature and atmospheric pressure.Type: ApplicationFiled: August 11, 2006Publication date: December 7, 2006Inventors: Toru Ushirogouchi, Chiaki Tanuma, Kazuhiko Ohtsu, Ryozo Akiyama, Masashi Hiroki, Yoshito Endo
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Patent number: 7125112Abstract: There is disclosed a liquid ink including a photo acid generating agent that generates an acid upon irradiation with light, a coloring component, and at least one kind of a solvent that is polymerized in the presence of an acid. It is preferable that the amount of the photo acid generating agent contained in the liquid ink falls within a range of between 1 part by weight and 10 parts by weight relative to 100 parts by weight of the solvent, the coloring component consists of a pigment, and the solvent contains at least 50 parts by weight of an acid polymerizable compound, the acid polymerizing compound polymerizing in the presence of the acid, having an alicyclic skeleton and/or an aliphatic skeleton having a viscosity of 50 mPa·s or less and a boiling point of 150° C. or more under room temperature and atmospheric pressure.Type: GrantFiled: March 31, 2005Date of Patent: October 24, 2006Assignees: Toshiba Tec Kabushiki Kaisha, Kabushiki Kaisha ToshibaInventors: Toru Ushirogouchi, Chiaki Tanuma, Kazuhiko Ohtsu, Ryozo Akiyama, Masashi Hiroki, Yoshito Endo
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Patent number: 7108367Abstract: There is disclosed a liquid ink including a photo acid generating agent that generates an acid upon irradiation with light, a coloring component, and at least one kind of a solvent that is polymerized in the presence of an acid. It is preferable that the amount of the photo acid generating agent contained in the liquid ink falls within a range of between 1 part by weight and 10 parts by weight relative to 100 parts by weight of the solvent, the coloring component consists of a pigment, and the solvent contains at least 50 parts by weight of an acid polymerizable compound, the acid polymerizing compound polymerizing in the presence of the acid, having an alicyclic skeleton and/or an aliphatic skeleton having a viscosity of 50 mpa·s or less and a boiling point of 150° C. or more under room temperature and atmospheric pressure.Type: GrantFiled: March 31, 2005Date of Patent: September 19, 2006Assignees: Toshiba Tec Kabushiki Kaisha, Kabushiki Kaisha ToshibaInventors: Toru Ushirogouchi, Chiaki Tanuma, Kazuhiko Ohtsu, Ryozo Akiyama, Masashi Hiroki, Yoshito Endo
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Publication number: 20060189716Abstract: A dispersion for ink is provided, which includes a dispersion medium, powder or pigment having an average particle diameter of not more than 300 nm, a polymer dispersing agent containing a first resinous dispersing agent and a second resinous dispersing agent, and an ionic compound. A mixing amount of the powder or pigment is 2% to 60% based on a total weight of the dispersion medium, a mixing amount of the first resinous dispersing agent is 1% to 60% based on a total weight of the powder or pigment, the second resinous dispersing agent is a resin having a basic terminal and a mixing amount of the second resinous dispersing agent is 1% to 30% based on a total weight of the powder or pigment, and a mixing amount of the ionic compound is 0.01% to 40% based on a total weight of the dispersion medium.Type: ApplicationFiled: February 21, 2006Publication date: August 24, 2006Inventors: Toru Ushirogouchi, Ryozo Akiyama, Kazuhiko Ohtsu, Mitsuru Ishibashi, Hiroshi Kiyomoto, Masashi Hiroki, Yukiko Kawakami
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Publication number: 20060189715Abstract: An inkjet ink is provided, which includes a pigment dispersion containing an organic dispersant, a black pigment having an average particle diameter of not more than 200 nm, and a resinous dispersing agent, the organic dispersant being formed of at least one polymerizable compound, and the black pigment being included therein at an amount ranging from 2 to 30% by weight based on the organic dispersant, and an ionic compound. A ?-potential of the black pigment to the at least one polymerizable compound of the organic dispersant is confined within the range of ?10 mV to +100 mV.Type: ApplicationFiled: February 21, 2006Publication date: August 24, 2006Inventors: Mitsuru Ishibashi, Toru Ushirogouchi, Hiroshi Kiyomoto, Ryozo Akiyama, Kazuhiko Ohtsu, Yukiko Kawakami, Masashi Hiroki
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Publication number: 20060114305Abstract: Disclosed is a method of exposure-curing an ink layer formed on a recording medium. The layer is made of an ink comprising at least one solvent polymerizable by an acid, a photo-acid generating agent capable of generating the acid as irradiated with light, and a colorant component. This method comprises two irradiation steps. In the first irradiation, the ink layer is irradiated with light by using a light source having a first peak illuminance. The acid is thereby generated from the photo-acid generating agent. The diffusion of the acid is promoted in the layer, curing the ink layer to some extent. In the second irradiation, the ink layer is irradiated with light by using a light source having a second peak illuminance higher than the first peak illuminance. More acid is generated from the photo-acid generating agent and diffuses in the layer, completely curing the ink layer.Type: ApplicationFiled: February 23, 2005Publication date: June 1, 2006Inventors: Kazuhiko Ohtsu, Toru Ushirogouchi, Ryozo Akiyama, Hiroshi Kiyomoto, Mitsuru Ishibashi, Masashi Hiroki, Yukiko Kawakami