Patents by Inventor Nobuaki Urashima
Nobuaki Urashima 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: 6451941Abstract: An inorganic dispersion stabilizer having a hydrophobic inorganic oxide such as hydrophobic silica dispersed in an aqueous medium in the presence of an hydrophilic organic compound such as alcohol. An suspension polymerization process for producing resinous particles of a narrow particle diameter distribution by dispersing a monomer into an dispersion medium in the presence of the inorganic dispersion stabilizer, and polymerizing the monomer.Type: GrantFiled: December 23, 1997Date of Patent: September 17, 2002Assignee: Nippon Shokubai Co., Ltd.Inventors: Nobuaki Urashima, Hayato Ikeda
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Patent number: 6417283Abstract: Carbon black graft polymer which comprises carbon black and a polymer chain grafted thereto, the carbon black having a specific surface area of not more than 120 m2/g.Type: GrantFiled: September 13, 1999Date of Patent: July 9, 2002Assignee: Nippon Shokubai Co., Ltd.Inventors: Hayato Ikeda, Nobuaki Urashima, Nobuyuki Ando
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Patent number: 5973054Abstract: A method which produces colored minute particles by suspending in an aqueous suspending medium a polymerizable monomer composition obtained by dispersing a coloring agent at least in a polymerizable monomer and polymerizing the resultant suspension is characterized in that the dispersion of the coloring agent in the polymerizable monomer is performed in the presence of a dispersing agent, the polymerizable monomer composition exhibits a viscosity of not more than 300 cP, and the suspension of the polymerizable monomer composition in the aqueous suspending medium exhibits a viscosity of not more than 100 cP. The dispersing agent is at least one resin selected from the group consisting of rosin derivatives, aromatic petroleum resins, pinene type resins, epoxy type resins, cumdrone resins, and styrene-acryl type resins.Type: GrantFiled: August 5, 1997Date of Patent: October 26, 1999Assignee: Nippon Shokubal Co., Ltd.Inventors: Mitsuo Kushino, Nobuaki Urashima, Makoto Matsumoto, Tatsuhito Matsuda, Kazuhiro Anan
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Patent number: 5955233Abstract: A static charge developing toner excelling in resistance to offset and low-temperature fixing property and using as at least part of a binder resin component an epoxy resin-including binder resin which is obtained by polymerizing a polymerizable monomer in the presence of an epoxy resin.Type: GrantFiled: June 23, 1997Date of Patent: September 21, 1999Assignee: Nippon Shokubai Co., Ltd.Inventors: Nobuaki Urashima, Mitsuo Kushino, Tatsuhito Matsuda
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Patent number: 5789506Abstract: A polymeric monomer (A) having as a main component thereof a (meth)acryl type monomer which is subjected to aqueous suspension polymerization in the presence of a compound (B) which is substantially insoluble in water and sparingly soluble in the polymeric monomer (A). The compound (B) has at least one, preferably two or more, structural units, selected from the group consisting of --SH, --S--S--, --COOH, --NO.sub.2, and --OH. The use of compound (B), in the suspension polymerization of the (meth)acryl type monomer, represses of the production of by-produced minute particles due to sympathetic emulsion polymerization. The suspension polymerization permits production of (meth)acryl type polymer particles having high heat stability and a small range of particle diameters.Type: GrantFiled: October 28, 1996Date of Patent: August 4, 1998Assignee: Nippon Shokubai Co., Ltd.Inventors: Hironobu Toribuchi, Nobuaki Urashima, Yoshikuni Mori
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Patent number: 5605992Abstract: A suspension polymerization of a polymerizable monomer in the presence of an emulsion polymerization inhibitor is disclosed. The inhibitor is an aromatic series compound having a NO.sub.2 group, a SO.sub.3 Na group, and a secondary amino group, representatively, the following compound. In this suspension polymerization, the production of by-produced microfine particles caused by the emulsion polymerization as the secondary polymerization scheme is repressed.Type: GrantFiled: May 30, 1995Date of Patent: February 25, 1997Assignee: Nippon Shokubai Co., Ltd.Inventors: Nobuaki Urashima, Hayato Ikeda, Mitsuo Kushino, Yoshikuni Mori
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Patent number: 5420218Abstract: A polymeric monomer (A) having as a main component thereof a (meth)acryl type monomer which is subjected to aqueous suspension polymerization in the presence of a compound (B) which is substantially insoluble in water and sparingly soluble in the polymeric monomer (A). The compound (B) has at least one, preferably two or more, structural units, selected from the group consisting of --SH, --S--S--, --COOH, --NO.sub.2, and --OH. The use of compound (B), in the suspension polymerization of the (meth)acryl type monomer, represses of the production of by-produced minute particles due to sympathetic emulsion polymerization. The suspension polymerization permits production of meth)acryl type polymer particles having high heat stability and a small range of particle diameters.Type: GrantFiled: June 15, 1993Date of Patent: May 30, 1995Assignee: Nippon Shokubai Co., Ltd.Inventors: Hironobu Toribuchi, Nobuaki Urashima, Yoshikuni Mori
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Patent number: 5193751Abstract: Coloring fine particles produced by heating spheroidal coloring fine particles with an average fine particle diameter of 1-100 .mu.m obtained by suspension polymerization to a temperature of 30.degree. to 200.degree. C., thereby causing the particles to fuse together in a block without completely destroying the particle interfaces, and then crushing the block to substantially the same average particle diameter of the spheroidal coloring particles before melting, and a toner for developing electrostatic images using the same.Type: GrantFiled: July 30, 1991Date of Patent: March 16, 1993Assignee: Nippon Shokubai Kagaku Kogyo Co., Ltd.Inventors: Yoshikuni Mori, Hayato Ikeda, Mitsuo Kushino, Nobuaki Urashima, Keiichi Uehara, Masuji Izubayashi, Yoshinori Sano
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Patent number: 5080992Abstract: Coloring fine particles produced by heating spheroidal coloring fine particles with an average fine particle diameter of 1-100 .mu.m obtained by suspension polymerization to a temperature of 30.degree. to 200.degree. C., thereby causing the particles to fuse together in a block without completely destroying the particle interfaces, and then crushing the block to substantially the same average particle diameter of the spheroidal coloring particle before melting, and a toner for developing electrostatic images using the same.Type: GrantFiled: August 29, 1989Date of Patent: January 14, 1992Assignee: Nippon Shokubai Kagaku Kogyo Co., Ltd.Inventors: Yoshikuni Mori, Hayato Ikeda, Mitsuo Kushino, Nobuaki Urashima, Keiichi Uehara, Masuji Izubayashi, Yoshinori Sano
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Patent number: 4994520Abstract: A carbon black-graft polymer, produced by causing a polymer possessing within the molecular unit thereof at least one reactive group selected from the class consisting of aziridine group, oxazoline group. N-hydroxyalkylamide group, epoxy group, and thioepoxy group to react with carbon black. The polymer can be used as a toner for electrostatically charged image, resin composition, coating composition, ink for thermographic transfer, coating agent for magnetic recording medium, rubber composition, and carbon black dispersion and the like.Type: GrantFiled: June 6, 1990Date of Patent: February 19, 1991Assignee: Nippon Shokubai Kagaku Kogyo Co., Ltd.Inventors: Yoshikuni Mori, Mitsuo Kushino, Hayato Ideda, Nobuaki Urashima, Masuji Izubayashi, Shigeru Tanimori, Yoshihiro Arita, Kiyoshi Kawamura, Kenji Minami, Yoshinori Sano
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Patent number: 4983681Abstract: Colored microfine globular particles are produced by causing carbon black to react with a polymer capable of reacting with the carbon black thereby forming a carbon black-graft polymer, dispersing this carbon black-graft polymer in a polymerizable monomer component, and then polymerizing the polymerizable monomer component. These particles, in the unmodified form, are usable as a toner for the development of images of static charge and, in a form incorporated in a varying component, are usable such as in resin composition, coating composition, thermosensitive transfer ink ribbon coating agent, thermosensitive transfer ink, or back-coating agent for magnetic recording medium.Type: GrantFiled: December 22, 1989Date of Patent: January 8, 1991Assignee: Nippon Shokubai Kagaku Kogyo Kabushiki KaishaInventors: Yoshikuni Mori, Mitsuo Kushino, Hayato Ikeda, Nobuaki Urashima, Kenji Minami, Iwao Fukikawa
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Patent number: 4940749Abstract: A carbon black-graft polymer, produced by causing a polymer possessing within the molecular unit thereof at least one reactive group selected from the class consisting of aziridine group, oxazoline group. N-hydroxyalkylamide group, epoxy group, and thioepoxy group to react with carbon balck. The polymer can be used as a toner for electrostatically charged image, resin composition, coating composition, ink for thermographic transer, coating gent for magnetic recording medium, rubber composition, and carbon black dispersion and the like.Type: GrantFiled: June 29, 1989Date of Patent: July 10, 1990Assignee: Nippon Shokubai Kagaku Kogyo Co., Ltd.Inventors: Yoshikuni Mori, Mitsuo Kushino, Hayato Ikeda, Nobuaki Urashima, Masuji Izubayashi, Shigeru Tanimori, Yoshihiro Arita, Kiyoshi Kawamura, Kenji Minami, Yoshinori Sano
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Patent number: 4910113Abstract: Colored microfine globular particles are produced by causing carbon black to react with a polymer capable of reacting with the carbon black thereby forming a carbon black-graft polymer, dispersing this carbon black-graft polymer in a polymerizable monomer component, and then polymerizing the polymerizable monomer component. These particles, in the unmodified form, are usable as a toner for the development of images of static charge and, in a form incorporated in a varying component, are usable such as in resin composition, coating composition, thermosensitive transfer ink ribbon coating agent, thermosensitive transfer ink, or back-coating agent for magnetic recording medium.Type: GrantFiled: July 7, 1988Date of Patent: March 20, 1990Assignee: Nippon Shokubai Kagaku Kogyo Kabushiki KaishaInventors: Yoshikuni Mori, Mitsuo Kushino, Hayato Ikeda, Nobuaki Urashima, Kenji Minami, Iwao Fujikawa
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Patent number: 4880857Abstract: A carbon black-graft polymer, produced by causing a polymer possessing within the molecular unit thereof at least one reactive group selected from the class consisting of aziridine group, oxazoline group. N-hydroxyalkylamide group, epoxy group, and thioepoxy group to react with carbon black. The polymer can be used as a toner for electrostatically charged image, resin composition, coating composition, ink for thermographic transer, coating gent for magnetic recording medium, rubber composition, and carbon black dispersion and the like.Type: GrantFiled: December 16, 1987Date of Patent: November 14, 1989Assignee: Nippon Shokubai Kagaku Kogyo Co., Ltd.Inventors: Yoshikuni Mori, Mitsuo Kushino, Hayato Ikeda, Nobuaki Urashima, Masuji Izubayashi, Shigeru Tanimori, Yoshihiro Arita, Kiyoshi Kawamura, Kenji Minami, Yoshinori Sano