Patents by Inventor Shinsuke Nagai
Shinsuke Nagai 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: 11504883Abstract: Provided is a resin particle producing method including: a fiber aggregate producing step of directly joining fibers containing a thermoplastic resin with each other to obtain a fiber aggregate; and a particle forming step of forming the fiber aggregate into particles to obtain resin particles.Type: GrantFiled: November 9, 2018Date of Patent: November 22, 2022Assignee: Ricoh Company, Ltd.Inventors: Nozomu Tamoto, Hitoshi Iwatsuki, Yasuo Suzuki, Yasuyuki Yamashita, Sohichiroh Iida, Shinzo Higuchi, Akira Saito, Kiichi Kamoda, Yoshihiko Furugohri, Shinsuke Nagai
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Publication number: 20200398458Abstract: Provided is a resin particle producing method including: a fiber aggregate producing step of directly joining fibers containing a thermoplastic resin with each other to obtain a fiber aggregate; and a particle forming step of forming the fiber aggregate into particles to obtain resin particles.Type: ApplicationFiled: November 9, 2018Publication date: December 24, 2020Inventors: Nozomu TAMOTO, Hitoshi IWATSUKI, Yasuo SUZUKI, Yasuyuki YAMASHITA, Sohichiroh IIDA, Shinzo HIGUCHI, Akira SAITO, Kiichi KAMODA, Yoshihiko FURUGOHRI, Shinsuke NAGAI
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Patent number: 10073366Abstract: A toner is provided. The toner includes an amorphous resin, a crystalline resin dispersed in the amorphous resin, and a release agent. The toner satisfies the following inequality: B/A<0.8 where A represents a perimeter of the crystalline resin and B represents a length of a part of the perimeter A of the crystalline resin at which the crystalline resin is in contact with the amorphous resin, A and B being measured from a cross-sectional image of the toner observed with transmission electron microscope.Type: GrantFiled: June 14, 2017Date of Patent: September 11, 2018Assignee: Ricoh Company, Ltd.Inventors: Kohsuke Nagata, Ryuuta Yoshida, Shinya Nakayama, Tsuyoshi Sugimoto, Akinori Saitoh, Hideyuki Santo, Suzuka Karato, Koh Ohnuma, Takahiro Kadota, Shinsuke Nagai, Akihiro Takeyama
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Patent number: 9921503Abstract: A toner including: a pigment; polyester resin A that is insoluble in tetrahydrofuran (THF); and polyester resin B that is soluble in THF, wherein the toner satisfies requirements (1) to (3) below: (1) the polyester resin A includes one or more aliphatic diols including from 3 through 10 carbon atoms, as a component constituting the polyester resin A; (2) the polyester resin B includes at least an alkylene glycol in an amount of 40 mol % or more, as a component constituting the polyester resin B; and (3) a glass transition temperature (Tg1st) of the toner at first heating in differential scanning calorimetry (DSC) of the toner is from 20° C. through 50° C.Type: GrantFiled: January 6, 2015Date of Patent: March 20, 2018Assignee: Ricoh Company, Ltd.Inventors: Hiroshi Yamada, Tsuyoshi Sugimoto, Susumu Chiba, Shinsuke Nagai, Kohsuke Nagata, Shinya Nakayama, Yuka Mizoguchi, Suzuka Amemori
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Publication number: 20170363980Abstract: A toner is provided. The toner includes an amorphous resin, a crystalline resin dispersed in the amorphous resin, and a release agent. The toner satisfies the following inequality: B/A<0.8 where A represents a perimeter of the crystalline resin and B represents a length of a part of the perimeter A of the crystalline resin at which the crystalline resin is in contact with the amorphous resin, A and B being measured from a cross-sectional image of the toner observed with transmission electron microscope.Type: ApplicationFiled: June 14, 2017Publication date: December 21, 2017Inventors: Kohsuke NAGATA, Ryuuta YOSHIDA, Shinya NAKAYAMA, Tsuyoshi SUGIMOTO, Akinori SAITOH, Hideyuki SANTO, Suzuka KARATO, Koh OHNUMA, Takahiro KADOTA, Shinsuke NAGAI, Akihiro TAKEYAMA
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Patent number: 9785074Abstract: A polyester resin for a toner, the polyester resin including: a segment derived from an alcohol component; and a segment derived from a carboxylic acid component, wherein the alcohol component includes a trivalent or higher aliphatic alcohol, and wherein the polyester resin satisfies Expressions (1) to (3) below: 500 ? Weight ? ? average ? ? molecular ? ? weight ? ? ( Mw ) ( Valence ? ? of ? ? the ? ? trivalent ? ? or higher ? ? aliphatic ? ? alcohol ) × ( Amount ? ? of ? ? the ? ? trivalent ? ? or higher ? ? aliphatic ? ? alcohol ) ? 4 , 000 ; Expression ? ? ( 1 ) 4,000?Weight average molecular weight (Mw)?25,000?? Expression (2); and 0.5?(Amount of the trivalent or higher aliphatic alcohol)?6.Type: GrantFiled: January 6, 2015Date of Patent: October 10, 2017Assignee: Ricoh Company, Ltd.Inventors: Kohsuke Nagata, Shinya Nakayama, Tsuyoshi Sugimoto, Hiroshi Yamada, Susumu Chiba, Shinsuke Nagai, Suzuka Amemori
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Patent number: 9588451Abstract: A toner, wherein an amount of Al detected in the toner is 0.7% to 1.3%, where the amount of Al detected is determined based on quantitative analysis of Al by X-ray photoelectron spectroscopic analysis (XPS), and wherein [Tg2nd (THF insoluble matter)] is ?40° C. to 30° C., where the [Tg2nd (THF insoluble matter)] is a glass transition temperature measured in second heating of differential scanning calorimetry (DSC) of THF insoluble matter of the toner.Type: GrantFiled: April 27, 2015Date of Patent: March 7, 2017Assignee: Ricoh Company, Ltd.Inventors: Akihiro Takeyama, Shinya Nakayama, Akinori Saitoh, Shinsuke Nagai, Hiroyuki Takeda
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Patent number: 9557669Abstract: A toner, wherein the toner has glass transition temperature [Tg1st (toner)] of 20° C. to 50° C., where the glass transition temperature [Tg1st (toner)] is measured in a first heating in differential scanning calorimetry (DSC) of the toner, wherein tetrahydrofuran (THF) insoluble matter of the toner has glass transition temperature [Tg2nd (THF insoluble matter)] of ?40° C. to 30° C., where the glass transition temperature [Tg2nd (THF insoluble matter)] is measured in a second heating in differential scanning calorimetry (DSC) of the tetrahydrofuran (THF) insoluble matter, wherein the THF insoluble matter has a storage modulus at 100° C. [G?(100) (THF insoluble matter)] of 1.0×105 Pa to 1.0×107 Pa, and wherein a ratio of a storage modulus of the THF insoluble matter at 40° C. [G?(40) (THF insoluble matter)] to the storage modulus of the THF insoluble matter at 100° C. [G?(100) (THF insoluble matter)] is 3.5×10 or less.Type: GrantFiled: August 29, 2014Date of Patent: January 31, 2017Assignee: Ricoh Company, Ltd.Inventors: Shinsuke Nagai, Shinya Nakayama, Tsuyoshi Sugimoto, Susumu Chiba, Kohsuke Nagata, Daisuke Asahina
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Patent number: 9557672Abstract: A toner, including: a polyester resin, wherein the polyester resin includes a diol component and a crosslink component as constituent components thereof, wherein the diol component contains an aliphatic diol having 3 to 10 carbon atoms in an amount of 50 mol % or more, wherein the crosslink component contains a trihydric or higher aliphatic alcohol, and wherein the toner has a glass transition temperature (Tg1st) of 20° C. to 50° C., where the glass transition temperature (Tg1st) is measured in first heating in differential scanning calorimetry (DSC) of the toner.Type: GrantFiled: August 13, 2014Date of Patent: January 31, 2017Assignee: Ricoh Company, Ltd.Inventors: Susumu Chiba, Tsuyoshi Sugimoto, Shinya Nakayama, Kohsuke Nagata, Shinsuke Nagai, Daisuke Asahina
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Patent number: 9557671Abstract: A toner, including: base particles containing a polyester resin, a colorant, and a release agent, wherein the toner has a glass transition temperature (Tg1st) of 20° C. to 50° C. where the glass transition temperature (Tg1st) is measured in first heating of differential scanning calorimetry (DSC) of the toner, wherein tetrahydrofuran (THF) insoluble matter of the toner has a glass transition temperature [Tg2nd (THF insoluble matter)] of 30° C. or lower where the glass transition temperature [Tg2nd (THF insoluble to matter)] is measured in second heating of differential scanning calorimetry (DSC) of the THF insoluble matter, and wherein 50% or less of the colorant is present within a region of 1,000 nm from a surface of each of the base particles toward a center thereof.Type: GrantFiled: February 24, 2015Date of Patent: January 31, 2017Assignee: Ricoh Company, Ltd.Inventors: Ryuta Chiba, Shinya Nakayama, Hiroshi Yamada, Minoru Masuda, Akinori Saitoh, Hideyuki Santo, Shinsuke Nagai, Akihiro Takeyama, Hiroyuki Takeda, Tsuyoshi Sugimoto, Suzuka Amemori, Kohsuke Nagata
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Publication number: 20170017175Abstract: A toner including: a pigment; polyester resin A that is insoluble in tetrahydrofuran (THF); and polyester resin B that is soluble in THF, wherein the toner satisfies requirements (1) to (3) below: (1) the polyester resin A includes one or more aliphatic diols including from 3 through 10 carbon atoms, as a component constituting the polyester resin A; (2) the polyester resin B includes at least an alkylene glycol in an amount of 40 mol % or more, as a component constituting the polyester resin B; and (3) a glass transition temperature (Tg1st) of the toner at first heating in differential scanning calorimetry (DSC) of the toner is from 20° C. through 50° C.Type: ApplicationFiled: January 6, 2015Publication date: January 19, 2017Inventors: Hiroshi YAMADA, Tsuyoshi SUGIMOTO, Susumu CHIBA, Shinsuke NAGAI, Kohsuke NAGATA, Shinya NAKAYAMA, Yuka MIZOGUCHI, Suzuka AMEMORI
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Publication number: 20170010550Abstract: A polyester resin for a toner, the polyester resin including: a segment derived from an alcohol component; and a segment derived from a carboxylic acid component, wherein the alcohol component includes a trivalent or higher aliphatic alcohol, and wherein the polyester resin satisfies Expressions (1) to (3) below: 500 ? Weight ? ? average ? ? molecular ? ? weight ? ? ( Mw ) ( Valence ? ? of ? ? the ? ? trivalent ? ? or higher ? ? aliphatic ? ? alcohol ) × ( Amount ? ? of ? ? the ? ? trivalent ? ? or higher ? ? aliphatic ? ? alcohol ) ? 4 , 000 ; Expression ? ? ( 1 ) 4,000?Weight average molecular weight (Mw)?25,000?? Expression (2); and 0.5?(Amount of the trivalent or higher aliphatic alcohol)?6.Type: ApplicationFiled: January 6, 2015Publication date: January 12, 2017Inventors: Kohsuke NAGATA, Shinya NAKAYAMA, Tsuyoshi SUGIMOTO, Hiroshi YAMADA, Susumu CHIBA, Shinsuke NAGAI, Suzuka AMEMORI
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Patent number: 9488925Abstract: A magenta toner for electrophotography, including: a polyester resin; and a colorant containing a naphthol-based pigment, wherein the magenta toner for electrophotography satisfies requirements <1> and <2> below: <1> [G?(100)(THF insoluble matter)] is 1.0×105 Pa to 1.0×107 Pa, and a ratio of [G?(40)(THF insoluble matter)] to the [G?(100)(THF insoluble matter)] is 3.5×10 or less, where the [G?(100)(THF insoluble matter)] is a storage modulus at 100° C. of THF insoluble matter of the toner and the [G?(40)(THF insoluble matter)] is a storage modulus at 40° C. of the THF insoluble matter of the toner; and <2> an X-ray diffraction pattern of the naphthol-based pigment in a crystalline state has a plurality of peaks in a range of 0°?2??35°, and a sum of half value widths of the peaks is 5° to 10°.Type: GrantFiled: February 25, 2015Date of Patent: November 8, 2016Assignee: Ricoh Company, Ltd.Inventors: Ryuta Chiba, Shinya Nakayama, Tsuyoshi Sugimoto, Hiroshi Yamada, Susumu Chiba, Shinsuke Nagai, Hiroshi Yamashita, Masana Shiba
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Publication number: 20160231661Abstract: A toner, wherein the toner has glass transition temperature [Tg1st (toner)] of 20° C. to 50° C., where the glass transition temperature [Tg1st (toner)] is measured in a first heating in differential scanning calorimetry (DSC) of the toner, wherein tetrahydrofuran (THF) insoluble matter of the toner has glass transition temperature [Tg2nd (THF insoluble matter)] of ?40° C. to 30° C., where the glass transition temperature [Tg2nd (THF insoluble matter)] is measured in a second heating in differential scanning calorimetry (DSC) of the tetrahydrofuran (THF) insoluble matter, wherein the THF insoluble matter has a storage modulus at 100° C. [G?(100) (THF insoluble matter)] of 1.0×105 Pa to 1.0×107 Pa, and wherein a ratio of a storage modulus of the THF insoluble matter at 40° C. [G?(40) (THF insoluble matter)] to the storage modulus of the THF insoluble matter at 100° C. [G?(100) (THF insoluble matter)] is 3.5×10 or less.Type: ApplicationFiled: August 29, 2014Publication date: August 11, 2016Inventors: Shinsuke NAGAI, Shinya NAKAYAMA, Tsuyoshi SUGIMOTO, Susumu CHIBA, Kohsuke NAGATA, Daisuke ASAHINA
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Publication number: 20160209766Abstract: A toner, including: a polyester resin, wherein the polyester resin includes a diol component and a crosslink component as constituent components thereof, wherein the diol component contains an aliphatic diol having 3 to 10 carbon atoms in an amount of 50 mol % or more, wherein the crosslink component contains a trihydric or higher aliphatic alcohol, and wherein the toner has a glass transition temperature (Tg1st) of 20° C. to 50° C., where the glass transition temperature (Tg1st) is measured in first heating in differential scanning calorimetry (DSC) of the toner.Type: ApplicationFiled: August 13, 2014Publication date: July 21, 2016Inventors: Susumu CHIBA, Tsuyoshi SUGIMOTO, Shinya NAKAYAMA, Kohsuke NAGATA, Shinsuke NAGAI, Daisuke ASAHINA
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Publication number: 20160187795Abstract: Provided is a toner including at least a polyester resin, wherein the polyester resin has a urethane bond and a urea bond, wherein a ratio (B)/(A) between a nitrogen content (A) in a compound that is contained in a pyrolysate of the toner produced when the toner is pyrolyzed from 50° C. to 700° C. and has two isocyanate groups and a nitrogen content (B) in a compound that is contained in the pyrolysate and has one isocyanate group and one amino group satisfies 0.6?(B)/(A)?1.3, and wherein a nitrogen content in the surface of the toner is from 0 atom % to 0.9 atom %.Type: ApplicationFiled: December 27, 2015Publication date: June 30, 2016Inventors: Akinori SAITOH, Tsuyoshi SUGIMOTO, Shinsuke NAGAI, Hiroyuki TAKEDA, Takahiro KADOTA, Akihiro TAKEYAMA
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Publication number: 20150323878Abstract: A toner, wherein an amount of Al detected in the toner is 0.7% to 1.3%, where the amount of Al detected is determined based on quantitative analysis of Al by X-ray photoelectron spectroscopic analysis (XPS), and wherein [Tg2nd (THF insoluble matter)] is ?40° C. to 30° C., where the [Tg2nd (THF insoluble matter)] is a glass transition temperature measured in second heating of differential scanning calorimetry (DSC) of THF insoluble matter of the toner.Type: ApplicationFiled: April 27, 2015Publication date: November 12, 2015Inventors: Akihiro TAKEYAMA, Shinya NAKAYAMA, Akinori SAITOH, Shinsuke NAGAI, Hiroyuki TAKEDA
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Publication number: 20150253687Abstract: A magenta toner for electrophotography, including: a polyester resin; and a colorant containing a naphthol-based pigment, wherein the magenta toner for electrophotography satisfies requirements <1> and <2> below: <1> [G?(100)(THF insoluble matter)] is 1.0×105 Pa to 1.0×107 Pa, and a ratio of [G?(40)(THF insoluble matter)] to the [G?(100)(THF insoluble matter)] is 3.5×10 or less, where the [G?(100)(THF insoluble matter)] is a storage modulus at 100° C. of THF insoluble matter of the toner and the [G?(40)(THF insoluble matter)] is a storage modulus at 40° C. of the THF insoluble matter of the toner; and <2> an X-ray diffraction pattern of the naphthol-based pigment in a crystalline state has a plurality of peaks in a range of 0°?2??35°, and a sum of half value widths of the peaks is 5° to 10°.Type: ApplicationFiled: February 25, 2015Publication date: September 10, 2015Inventors: Ryuta Chiba, Shinya Nakayama, Tsuyoshi Sugimoto, Hiroshi Yamada, Susumu Chiba, Shinsuke Nagai, Hiroshi Yamashita, Masana Shiba
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Publication number: 20150248070Abstract: A toner, including: base particles containing a polyester resin, a colorant, and a release agent, wherein the toner has a glass transition temperature (Tg1st) of 20° C. to 50° C. where the glass transition temperature (Tg1st) is measured in first heating of differential scanning calorimetry (DSC) of the toner, wherein tetrahydrofuran (THF) insoluble matter of the toner has a glass transition temperature [Tg2nd (THF insoluble matter)] of 30° C. or lower where the glass transition temperature [Tg2nd (THF insoluble to matter)] is measured in second heating of differential scanning calorimetry (DSC) of the THF insoluble matter, and wherein 50% or less of the colorant is present within a region of 1,000 nm from a surface of each of the base particles toward a center thereof.Type: ApplicationFiled: February 24, 2015Publication date: September 3, 2015Inventors: Ryuta CHIBA, Shinya Nakayama, Hiroshi Yamada, Minoru Masuda, Akinori Saitoh, Hideyuki Santo, Shinsuke Nagai, Akihiro Takeyama, Hiroyuki Takeda, Tsuyoshi Sugimoto, Suzuka Amemori, Kohsuke Nagata
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Publication number: 20040053638Abstract: A computer network which uses a community wiring for TV or wired broadcast and which is hardly influenced by disconnection, short-circuit and noise. The network is a coaxial cable network (1) which can transmit a mixed signal of the received signal of a receiver and a digital signal modulated into an RF signal. This coaxial cable network is provided with a signal input unit (2) for inputting a received signal into the coaxial cable network, and receivers (3a to 3c) and computers (4a to 4c) are connected with the coaxial cable network. Between the coaxial cable network and the computers, there are connected computer connection units (5a to 5c) for modulating a digital signal into an RF signal and for demodulating the RF signal into the digital signal.Type: ApplicationFiled: June 30, 2003Publication date: March 18, 2004Inventors: Tadao Ohnaka, Shinsuke Nagai, Masashi Iwai, Kazuhiro Yushina, Kenichiro Shimizu