Patents by Inventor Tokudai Ogawa
Tokudai Ogawa 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: 8481166Abstract: A hydrogenated norbornene ring-open polymer obtained by hydrogenating 80% or more of main-chain carbon-carbon double bonds of a ring-open polymer obtained by ring-opening polymerization of 2-norbornene. The hydrogenated norbornene ring-open polymer has a weight average molecular weight determined by gel permeation chromatography (GPC) of 50,000 to 200,000, a molecular weight distribution of 1.5 to 10.0, and a melting point of 110 to 145° C. A hydrogenated norbornene ring-open polymer obtained by hydrogenating 80% or more of carbon-carbon double bonds of a ring-open polymer obtained by ring-opening copolymerization of 2-norbornene and a substituent-containing norbornene monomer, wherein the proportion of a repeating unit (A) derived from the 2-norbornene with respect to all repeating units is 90 to 99 wt % and the proportion of a repeating unit (B) derived from the substituent-containing norbornene monomer with respect to all repeating units is 1 to 10 wt %. A resin composition and a molding material.Type: GrantFiled: December 23, 2011Date of Patent: July 9, 2013Assignee: Zeon CorporationInventors: Haruhiko Takahashi, Teiji Kohara, Nobuhiro Kudo, Koichi Ikeda, Tokudai Ogawa, Takeshi Hirata
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Patent number: 8277914Abstract: A polymer composition includes (1) a crystalline norbornene-based polymer and (2) an amorphous alicyclic structure-containing polymer in a weight ratio of 90:10 to 50:50, the crystalline norbornene-based polymer (1) having a melting point of 110 to 145° C., an Mw measured by gel permeation chromatography of 50,000 to 200,000, and a ratio Mw/Mn of 1.5 to 10.0, and obtained by ring-opening polymerization of a polymerizable monomer mixture (1) containing 90 to 100 wt % of 2-norbornene and 0 to 10 wt % of a substituent-containing norbornene monomer, and hydrogenating the resulting polymer, and the amorphous alicyclic structure-containing polymer (2) having a Tg of 50° C. or more and not having a melting point, and obtained by polymerization of a polymerizable monomer mixture (2) containing a 2-norbornene compound and a dicyclopentadiene compound in an amount of 50 wt % or more and less than 90 wt % in total. A film obtained by molding the polymer composition has a steam permeability of 0.Type: GrantFiled: September 30, 2009Date of Patent: October 2, 2012Assignee: Zeon CorporationInventors: Tokudai Ogawa, Hiroaki Matsuda
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Publication number: 20120208950Abstract: A hydrogenated norbornene ring-open polymer obtained by hydrogenating 80% or more of main-chain carbon-carbon double bonds of a ring-open polymer obtained by ring-opening polymerization of 2-norbornene. The hydrogenated norbornene ring-open polymer has a weight average molecular weight determined by gel permeation chromatography (GPC) of 50,000 to 200,000, a molecular weight distribution of 1.5 to 10.0, and a melting point of 110 to 145° C. A hydrogenated norbornene ring-open polymer obtained by hydrogenating 80% or more of carbon-carbon double bonds of a ring-open polymer obtained by ring-opening copolymerization of 2-norbornene and a substituent-containing norbornene monomer, wherein the proportion of a repeating unit (A) derived from the 2-norbornene with respect to all repeating units is 90 to 99 wt % and the proportion of a repeating unit (B) derived from the substituent-containing norbornene monomer with respect to all repeating units is 1 to 10 wt %. A resin composition and a molding material.Type: ApplicationFiled: December 23, 2011Publication date: August 16, 2012Applicant: ZEON CORPORATIONInventors: Haruhiko Takahashi, Teiji Kohara, Nobuhiro Kudo, Koichi Ikeda, Tokudai Ogawa, Takeshi Hirata
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Publication number: 20120171398Abstract: A hydrogenated norbornene ring-open polymer obtained by hydrogenating 80% or more of main-chain carbon-carbon double bonds of a ring-open polymer obtained by ring-opening polymerization of 2-norbornene. The hydrogenated norbornene ring-open polymer has a weight average molecular weight determined by gel permeation chromatography (GPC) of 50,000 to 200,000, a molecular weight distribution of 1.5 to 10.0, and a melting point of 110 to 145° C. A hydrogenated norbornene ring-open polymer obtained by hydrogenating 80% or more of carbon-carbon double bonds of a ring-open polymer obtained by ring-opening copolymerization of 2-norbornene and a substituent-containing norbornene monomer, wherein the proportion of a repeating unit (A) derived from the 2-norbornene with respect to all repeating units is 90 to 99 wt % and the proportion of a repeating unit (B) derived from the substituent-containing norbornene monomer with respect to all repeating units is 1 to 10 wt %. A resin composition and a molding material.Type: ApplicationFiled: December 23, 2011Publication date: July 5, 2012Applicant: ZEON CORPORATIONInventors: Haruhiko TAKAHASHI, Teiji KOHARA, Nobuhiro KUDO, Koichi IKEDA, Tokudai OGAWA, Takeshi HIRATA
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Publication number: 20120164465Abstract: A hydrogenated norbornene ring-open polymer obtained by hydrogenating 80% or more of main-chain carbon-carbon double bonds of a ring-open polymer obtained by ring-opening polymerization of 2-norbornene. The hydrogenated norbornene ring-open polymer has a weight average molecular weight determined by gel permeation chromatography (GPC) of 50,000 to 200,000, a molecular weight distribution of 1.5 to 10.0, and a melting point of 110 to 145° C. A hydrogenated norbornene ring-open polymer obtained by hydrogenating 80% or more of carbon-carbon double bonds of a ring-open polymer obtained by ring-opening copolymerization of 2-norbornene and a substituent-containing norbornene monomer, wherein the proportion of a repeating unit (A) derived from the 2-norbornene with respect to all repeating units is 90 to 99 wt % and the proportion of a repeating unit (B) derived from the substituent-containing norbornene monomer with respect to all repeating units is 1 to 10 wt %. A resin composition and a molding material.Type: ApplicationFiled: December 23, 2011Publication date: June 28, 2012Applicant: ZEON CORPORATIONInventors: Haruhiko Takahashi, Teiji Kohara, Nobuhiro Kudo, Koichi Ikeda, Tokudai Ogawa, Takeshi Hirata
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Publication number: 20120165461Abstract: A hydrogenated norbornene ring-open polymer obtained by hydrogenating 80% or more of main-chain carbon-carbon double bonds of a ring-open polymer obtained by ring-opening polymerization of 2-norbornene. The hydrogenated norbornene ring-open polymer has a weight average molecular weight determined by gel permeation chromatography (GPC) of 50,000 to 200,000, a molecular weight distribution of 1.5 to 10.0, and a melting point of 110 to 145° C. A hydrogenated norbornene ring-open polymer obtained by hydrogenating 80% or more of carbon-carbon double bonds of a ring-open polymer obtained by ring-opening copolymerization of 2-norbornene and a substituent-containing norbornene monomer, wherein the proportion of a repeating unit (A) derived from the 2-norbornene with respect to all repeating units is 90 to 99 wt % and the proportion of a repeating unit (B) derived from the substituent-containing norbornene monomer with respect to all repeating units is 1 to 10 wt %. A resin composition and a molding material.Type: ApplicationFiled: December 23, 2011Publication date: June 28, 2012Applicant: ZEON CORPORATIONInventors: Haruhiko TAKAHASHI, Teiji KOHARA, Nobuhiro Kudo, Koichi Ikeda, Tokudai Ogawa, Takeshi Hirata
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Publication number: 20100092712Abstract: A polymer composition includes (1) a crystalline norbornene-based polymer and (2) an amorphous alicyclic structure-containing polymer in a weight ratio of 90:10 to 50:50, the crystalline norbornene-based polymer (1) having a melting point of 110 to 145° C., an Mw measured by gel permeation chromatography of 50,000 to 200,000, and a ratio Mw/Mn of 1.5 to 10.0, and obtained by ring-opening polymerization of a polymerizable monomer mixture (1) containing 90 to 100 wt % of 2-norbornene and 0 to 10 wt % of a substituent-containing norbornene monomer, and hydrogenating the resulting polymer, and the amorphous alicyclic structure-containing polymer (2) having a Tg of 50° C. or more and not having a melting point, and obtained by polymerization of a polymerizable monomer mixture (2) containing a 2-norbornene compound and a dicyclopentadiene compound in an amount of 50 wt % or more and less than 90 wt % in total. A film obtained by molding the polymer composition has a steam permeability of 0.Type: ApplicationFiled: September 30, 2009Publication date: April 15, 2010Applicant: ZEON CORPORATIONInventors: Tokudai Ogawa, Hiroaki Matsuda
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Publication number: 20100076396Abstract: A hydrogenated norbornene ring-open polymer obtained by hydrogenating 80% or more of main-chain carbon-carbon double bonds of a ring-open polymer which is obtained by ring-opening polymerization of 2-norbornene is disclosed. The hydrogenated norbornene ring-open polymer has a weight average molecular weight (Mw) determined by gel permeation chromatography (GPC) of 50,000 to 200,000, a molecular weight distribution (Mw/Mn) of 1.5 to 10.0, and a melting point of 110 to 145° C.Type: ApplicationFiled: August 31, 2007Publication date: March 25, 2010Applicant: ZEON CORPORATIONInventors: Haruhiko Takahashi, Teiji Kohara, Nobuhiro Kudo, Koichi Ikeda, Tokudai Ogawa, Takeshi Hirata
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Patent number: 6720122Abstract: A toner for development of electrostatic images, comprising colored particles containing at least a binder resin, a colorant and a softening agent, wherein the softening agent is an organic compound having a molecular weight of at least 1,000, a solubility of at least 5 g in 100 g of styrene as measured at 25° C., and an acid value of at most 10 mg KOH/g. The toner is excellent in fixing ability, shelf stability and flowability and permits forming images having high image quality. A production process thereof is also provided.Type: GrantFiled: April 1, 2002Date of Patent: April 13, 2004Assignee: Zeon Corp.Inventor: Tokudai Ogawa
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Patent number: 6136490Abstract: A monomer for a shell or a mixture of at least two monomers for a shell was suspension polymerized in the presence of core particles and a polymerization initiator to obtain polymer particles, wherein said core particles are formed of a polymer obtained by polymerization of a monomer for a core or a mixture of at least two monomers for a core and containing a colorant, wherein said monomer for a shell or mixture of monomers for a shell is one which gives upon polymerization a polymer having a glass transition temperature higher than that of the polymer forming the core particle, and wherein said polymerization initiator is represented by the following formula 1: ##STR1## wherein X.sup.1, X.sup.2, X.sup.3 and X.sup.4 independently represent oxygen atom, sulfur atom, >NR (wherein R is hydrogen atom, alkyl group, or group); R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.Type: GrantFiled: December 4, 1997Date of Patent: October 24, 2000Assignee: Nippon Zeon Co., Ltd.Inventors: Tokudai Ogawa, Jun Sakai, Jun Hasegawa
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Patent number: 6132919Abstract: A polymerized toner of core-shell structure, comprising core particles composed of colored polymer particles, which comprise a polyfunctional ester compound formed of a trifunctional or still higher polyfunctional polyhydric alcohol and a carboxylic acid, and a colorant, and shell which is formed of a polymer having a glass transition temperature higher than that of a polymer component making up the core particles and covers each of the core particles, a production process thereof, an image forming process comprising using the polymerized toner, and an image forming apparatus containing the polymerized toner.Type: GrantFiled: May 5, 1999Date of Patent: October 17, 2000Assignee: Nippon Zeon Co., Ltd.Inventors: Tokudai Ogawa, Noboru Yanagida, Takahiro Takasaki, Kazuhiro Sato
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Patent number: 6033822Abstract: Disclosed herein are a polymerized toner of core-shell structure, comprising core particles composed of colored polymer particles having a volume average particle diameter (dv) of 0.5-20 .mu.m and a ratio (dv/dp) of the volume average particle diameter (dv) to a number average particle diameter (dp) of at most 1.7, and shell which is formed of a polymer layer having an average film thickness of 0.001-0.1 .mu.m and covers each of the core particles, and a production process thereof.Type: GrantFiled: July 27, 1999Date of Patent: March 7, 2000Assignee: Nippon Zeon Co., Ltd.Inventors: Jun Hasegawa, Tokudai Ogawa, Jun Sakai, Takahiro Takasaki, Noboru Yanagida
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Patent number: 5958640Abstract: Disclosed herein are a polymerized toner of core-shell structure, comprising core particles composed of colored polymer particles having a volume average particle diameter (dv) of 0.5-20 .mu.m and a ratio (dv/dp) of the volume average particle diameter (dv) to a number average particle diameter (dp) of at most 1.7, and shell which is formed of a polymer layer having an average film thickness of 0.001-0.1 .mu.m and covers each of the core particles, and a production process thereof.Type: GrantFiled: October 14, 1997Date of Patent: September 28, 1999Assignee: Nippon Zeon Company, LtdInventors: Jun Hasegawa, Tokudai Ogawa, Jun Sakai, Takahiro Takasaki, Noboru Yanagida
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Patent number: 5952144Abstract: A process for producing a toner for development of electrostatic latent images, which is composed of colored polymer particles and has a low fixing temperature, good permeability through OHP and excellent shelf stability, by subjecting a monomer composition containing at least a polymerizable monomer and a colorant to suspension polymerization in an aqueous dispersion medium containing a dispersing agent comprises at least two steps of:(1) the first step of subjecting a monomer composition for core component containing at least one monomer for core component, which is capable of forming a polymer having a glass transition temperature not higher than 80.degree. C.Type: GrantFiled: December 18, 1997Date of Patent: September 14, 1999Assignee: Nippon Zeon Co., Ltd.Inventors: Jun Hasegawa, Jun Sakai, Makoto Watanabe, Fumio Yamada, Tokudai Ogawa
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Patent number: 5741618Abstract: A process for producing a polymer toner comprises the steps of pouring a polymerizable monomer composition containing at least a polymerizable monomer and a colorant, but containing no oil-soluble polymerization initiator into an aqueous dispersion medium containing a dispersing agent; adding an oil-soluble polymerization initiator to the polymerizable monomer composition while stirring the composition to form primary droplets thereof, thereby bringing the droplets of the polymerizable monomer composition into contact with droplets of the oil-soluble polymerization initiator to form droplets of a polymerizable monomer composition containing the oil-soluble polymerization initiator; further continuing the stirring to form secondary droplets having desired droplet sizes; and then conducting suspension polymerization of the polymerizable monomer composition.Type: GrantFiled: October 10, 1996Date of Patent: April 21, 1998Assignee: Nippon Zeon Co. Ltd.Inventors: Kazunori Shigemori, Tokudai Ogawa
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Patent number: 5427885Abstract: A process for producing a toner for developing an electrostatic image, including the steps of: adding to an aqueous dispersion medium a polymerizable monomer composition comprising at least a polymerizable monomer and a colorant uniformly dissolved or dispersed in the polymerizable monomer, wherein the aqueous dispersion medium containing as a dispersion stabilizer a hardly water-soluble metal hydroxide colloid formed by a reaction of a water-soluble polyvalent metal salt with an alkali metal hydroxide in an aqueous phase; and subjecting the polymerizable monomer composition to suspension polymerization, thereby to produce particles having a volume-average particle size in the range of from 2 to 20 .mu.m and a particle size distribution (a ratio of volume-average particle size/number-average particle size) of not more than 1.6.Type: GrantFiled: March 28, 1994Date of Patent: June 27, 1995Assignee: Nippon Zeon Co., Ltd.Inventors: Nobuyasu Ota, Toyoko Imai, Jun Saito, Tokudai Ogawa