Patents by Inventor Akira Okamura
Akira Okamura 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: 8617345Abstract: Provided are a method of bonding resin materials for bonding a resin material (X) containing an oxymethylene-based polymer (A) and a resin material (Y), and a structure obtained by the bonding method. The method includes preparing as the resin material (Y) a low-melting-point oxymethylene-based polymer (B) having a melting point lower than that of the oxymethylene-based polymer (A) by 5 to 50° C., or preparing as the resin material (Y) the resin material (X) or another resin material, and providing the low-melting-point oxymethylene-based polymer (B) between the resin material (Y) and the resin material (X) and heating resin materials.Type: GrantFiled: December 3, 2007Date of Patent: December 31, 2013Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Akira Okamura, Satoshi Nagai
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Patent number: 8377250Abstract: Provided are a method of bonding a resin material (X) containing an oxymethylene-based polymer (A) and a resin material (Y), including: preparing an oxymethylene-based polymer composition (B) as resin material (Y), and resin material (X); or preparing resin material (X) and a resin material identical to resin material (X) or another resin material as resin material (Y), and providing polymer composition (B) between resin material (Y) and resin material (X); and heating: wherein polymer composition (B) has a melting point lower than that of polymer (A), and a difference in melting point between the composition and the polymer is smaller than 5° C.; and 50% or more of a peak area determined from a peak showing the molten state of polymer composition (B) measured by DSC is present in a temperature region lower than the peak temperature of polymer (A) by 5° C. or more; and a structure obtained thereby.Type: GrantFiled: December 3, 2007Date of Patent: February 19, 2013Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Akira Okamura, Satoshi Nagai
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Patent number: 8178627Abstract: Provided is an oxymethylene copolymer composition for a stretched material having a high strength and a high elastic modulus, the composition including: an oxymethylene copolymer; and a crosslinkable compound to be blended with the oxymethylene copolymer in an amount of 0.001 to 0.05 part by mass with respect to 100 parts by mass of the oxymethylene copolymer. The present invention also relates to a stretched material obtained by using the oxymethylene copolymer composition. Further, the present invention relates to a structure obtained by the secondary processing of the above stretched material, and a structure obtained by using the above oxymethylene copolymer composition in a bonding layer of the structure. The present invention also relates to a method of producing a structure, the method including: using the oxymethylene copolymer composition in a bonding layer of the structure; and removing a polyalkylene glycol component with water or a solvent.Type: GrantFiled: December 3, 2007Date of Patent: May 15, 2012Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Akira Okamura, Satoshi Nagai
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Publication number: 20110250456Abstract: The present invention has an object of providing a molded article of a composite structure obtained by bonding a polar thermoplastic resin, especially polyacetal, with another resin in a simple manner. According to the present invention, a molded article of a composite structure obtained by bonding a polar thermoplastic resin and a resin containing an aliphatic ester structure as a main component to each other in the state where at least a face at which both of the materials contact each other is in a melted state can be provided.Type: ApplicationFiled: May 26, 2009Publication date: October 13, 2011Inventors: Akira Okamura, Satoshi Nagai, Hiroyuki Hamada, Yew Wei Leong
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Publication number: 20110185527Abstract: The object is to provide a brush which does not easily damage metal during contact therewith. The present invention can provide a brush formed using polyacetal-containing filaments, in which the flexural rigidity per filament is 1 to 100 ?g·m2/yarn.Type: ApplicationFiled: March 27, 2009Publication date: August 4, 2011Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., NATIONAL UNIVERSITY CORPORATION KYOTO INSTITUTE OF TECHNOLOGYInventors: Akira Okamura, Satoshi Nagai, Masaya Kotaki, Sachiko Sukigara, Yasuhiko Fukami, Hiroshi Kobayashi
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Publication number: 20110171868Abstract: The present invention has an object of providing a novel multilayer composite fiber using polyacetal mainly derived from methanol, which is a petroleum-independent raw material, and having a low environmental load, and also providing a nonwoven fabric obtained by thermally bonding such fibers. According to the present invention, a multilayer composite fiber comprising a resin containing polylactic acid as a main component and a resin containing polyacetal as a main component, in which the components both form continuous layers in an axial direction of the fiber, and also a nonwoven fabric obtained by thermally bonding such fibers, can be provided.Type: ApplicationFiled: May 26, 2009Publication date: July 14, 2011Inventors: Akira Okamura, Satoshi Nagai
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Publication number: 20110111228Abstract: The present invention provides a polyacetal resin which has excellent spinnability and excellent moldability with little optical unevenness when it is molded into a film or a sheet. The present invention provides a polyacetal resin in which the number of fisheyes having a maximum length of 30 ?m or longer is 100 or less per 25 cm2 when it is measured using a film having a thickness of 30 ?m.Type: ApplicationFiled: June 25, 2009Publication date: May 12, 2011Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Daisuke Kobayashi, Akira Okamura
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Patent number: 7897672Abstract: The problem to be solved is to provide a process for producing a polyoxymethylene copolymer in a molding machine with a reduced generation of formaldehyde gas. In a process for continuously producing a polyoxymethylene copolymer comprising a step of melt-kneading a crude polyoxymethylene copolymer at a temperature not lower than the melting point thereof, devolatilizing under reduced pressure the formaldehyde gas generated as a decomposition product, subsequently mixing a formaldehyde scavenger containing a hydrazide compound (A) while keeping the copolymer in a molten state and immediately pelletizing the mixture, a dispersed solution obtained by slurry-dispersing said (A) in a diluent (B) having a melting point lower than temperature (Ta) which is the lower of the melting point and the decomposition temperature of (A), within a temperature range not lower than the melting point of (B) and lower than (Ta) is used as the formaldehyde scavenger.Type: GrantFiled: April 10, 2006Date of Patent: March 1, 2011Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Satoshi Nagai, Akira Okamura, Daisuke Sunaga
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Publication number: 20100041854Abstract: Provided are a method of bonding resin materials for bonding a resin material (X) containing an oxymethylene-based polymer (A) and a resin material (Y), and a structure obtained by the bonding method. The method includes the steps of: preparing as the resin material (Y) an oxymethylene-based polymer composition (B) satisfying the following conditions (1) and (2); or preparing as the resin material (Y) the resin material (X) or another resin material and providing the oxymethylene-based polymer composition (B) between the resin material (Y) and the resin material (X); and heating the resin materials: (1) the oxymethylene-based polymer composition (B) has a melting point lower than that of the oxymethylene-based polymer (A), and a difference in melting point between the composition and the polymer is smaller than 5° C.Type: ApplicationFiled: December 3, 2007Publication date: February 18, 2010Applicant: Mitsubishi Gas Chemical Company, Inc.Inventors: Akira Okamura, Satoshi Nagai
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Publication number: 20100021752Abstract: Provided are a method of bonding resin materials for bonding a resin material (X) containing an oxymethylene-based polymer (A) and a resin material (Y), and a structure obtained by the bonding method. The method includes preparing as the resin material (Y) a low-melting-point oxymethylene-based polymer (B) having a melting point lower than that of the oxymethylene-based polymer (A) by 5 to 50° C., or preparing as the resin material (Y) the resin material (X) or another resin material, and providing the low-melting-point oxymethylene-based polymer (B) between the resin material (Y) and the resin material (X) and heating resin materials.Type: ApplicationFiled: December 3, 2007Publication date: January 28, 2010Inventors: Akira Okamura, Satoshi Nagai
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Publication number: 20100015458Abstract: Provided is an oxymethylene copolymer composition for a stretched material having a high strength and a high elastic modulus, the composition including: an oxymethylene copolymer; and a crosslinkable compound to be blended with the oxymethylene copolymer in an amount of 0.001 to 0.05 part by mass with respect to 100 parts by mass of the oxymethylene copolymer. The present invention also relates to a stretched material obtained by using the oxymethylene copolymer composition. Further, the present invention relates to a structure obtained by the secondary processing of the above stretched material, and a structure obtained by using the above oxymethylene copolymer composition in a bonding layer of the structure. The present invention also relates to a method of producing a structure, the method including: using the oxymethylene copolymer composition in a bonding layer of the structure; and removing a polyalkylene glycol component with water or a solvent.Type: ApplicationFiled: December 3, 2007Publication date: January 21, 2010Applicant: MITSUBISHI GAS CHEMICAL COMPANY , INC.Inventors: Akira Okamura, Satoshi Nagai
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Patent number: 7590597Abstract: A center site is disposed to intervene in a business transaction achieved through a network. The center site includes an open business information database in which open business information received from member sites connected to the network is accumulated to be opened to the sites and a notarization database to keep therein contents of contracts of transactions between the sites. The center site receives a transaction request from a transaction partner site in accordance with the open business information and notifies the request to an information supply site associated therewith. The center site intervenes in a transaction resultantly accomplished between the information supply site and the transaction partner site and conducts a notarization process for the contents of contract for the transaction to accumulate the contract in a notarization database.Type: GrantFiled: July 29, 2008Date of Patent: September 15, 2009Assignee: Hitachi, Ltd.Inventors: Naoki Takahashi, Hiromitsu Shiina, Masahito Matsunawa, Shinichi Yamada, Yoshiharu Kamada, Tsuyoshi Miyake, Akira Okamura, Masasuke Tominaga
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Publication number: 20090062503Abstract: The problem to be solved is to provide a process for producing a polyoxymethylene copolymer in a molding machine with a reduced generation of formaldehyde gas. In a process for continuously producing a polyoxymethylene copolymer comprising a step of melt-kneading a crude polyoxymethylene copolymer at a temperature not lower than the melting point thereof, devolatilizing under reduced pressure the formaldehyde gas generated as a decomposition product, subsequently mixing a formaldehyde scavenger containing a hydrazide compound (A) while keeping the copolymer in a molten state and immediately pelletizing the mixture, a dispersed solution obtained by slurry-dispersing said (A) in a diluent (B) having a melting point lower than temperature (Ta) which is the lower of the melting point and the decomposition temperature of (A), within a temperature range not lower than the melting point of (B) and lower than (Ta) is used as the formaldehyde scavenger.Type: ApplicationFiled: April 10, 2006Publication date: March 5, 2009Applicant: Mitsubishi Gas Chemical Company, Inc.Inventors: Satoshi Nagai, Akira Okamura, Daisuke Sunaga
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Publication number: 20080313093Abstract: A center site is disposed to intervene in a business transaction achieved through a network. The center site includes an open business information database in which open business information received from member sites connected to the network is accumulated to be opened to the sites and a notarization database to keep therein contents of contracts of transactions between the sites. The center site receives a transaction request from a transaction partner site in accordance with the open business information and notifies the request to an information supply site associated therewith. The center site intervenes in a transaction resultantly accomplished between the information supply site and the transaction partner site and conducts a notarization process for the contents of contract for the transaction to accumulate the contract in a notarization database.Type: ApplicationFiled: July 29, 2008Publication date: December 18, 2008Inventors: Naoki Takahashi, Hiromitsu Shiina, Masahito Matsunawa, Shinichi Yamada, Yoshiharu Kamada, Tsuyoshi Miyake, Akira Okamura, Masasuke Tominaga
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Patent number: 7428511Abstract: A center site is disposed to intervene in a business transaction achieved through a network. The center site includes an open business information database in which open business information received from member sites connected to the network is accumulated to be opened to the sites and a notarization database to keep therein contents of contracts of transactions between the sites. The center site receives a transaction request from a transaction partner site in accordance with the open business information and notifies the request to an information supply site associated therewith. The center site intervenes in a transaction resultantly accomplished between the information supply site and the transaction partner site and conducts a notarization process for the contents of contract for the transaction to accumulate the contract in a notarization database.Type: GrantFiled: August 11, 2004Date of Patent: September 23, 2008Assignee: Hitachi, Ltd.Inventors: Naoki Takahashi, Hiromitsu Shiina, Masahito Matsunawa, Shinichi Yamada, Yoshiharu Kamada, Tsuyoshi Miyake, Akira Okamura, Masasuke Tominaga
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Publication number: 20060063863Abstract: A polyacetal resin composition comprising 100 parts by weight of a polyacetal polymer, 0.01 to 0.5 part by weight of a hydrazide compound, 0.01 to 0.1 part by weight of an amino-substituted triazine compound and 0.01 to 5 parts by weight of a hindered phenolic compound, wherein the resin composition has a total content of hydroxides, organic acid salts and inorganic acid salts of an alkali metal and an alkali earth metal of 50 ppm or less by weight in terms of the total of the alkali metal and the alkali earth metal; and a molded article thereof. The polyacetal resin composition greatly suppresses the emission of formaldehyde from a pellet or molded article thereof and rarely produces a mold deposit.Type: ApplicationFiled: September 19, 2005Publication date: March 23, 2006Inventors: Daisuke Sunaga, Yuji Takeda, Akira Okamura, Satoshi Nagai
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Publication number: 20050010526Abstract: A center site is disposed to intervene in a business transaction achieved through a network. The center site includes an open business information database in which open business information received from member sites connected to the network is accumulated to be opened to the sites and a notarization database to keep therein contents of contracts of transactions between the sites. The center site receives a transaction request from a transaction partner site in accordance with the open business information and notifies the request to an information supply site associated therewith. The center site intervenes in a transaction resultantly accomplished between the information supply site and the transaction partner site and conducts a notarization process for the contents of contract for the transaction to accumulate the contract in a notarization database.Type: ApplicationFiled: August 11, 2004Publication date: January 13, 2005Inventors: Naoki Takahashi, Hiromitsu Shiina, Masahito Matsunawa, Shinichi Yamada, Yoshiharu Kamada, Tsuyoshi Miyake, Akira Okamura, Masasuke Tominaga
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Patent number: 6617416Abstract: A polyoxymethylene copolymer which is a polyoxymethylene copolymer obtained by copolymerizing trioxane and 8 to 20 mol, per 100 mol of the trioxane, of 1,3-dioxolane and which (i) has a crystallization time period of 10 to 2,000 seconds at 143° C., (ii) withstands 30 to 1,000 cycles of a bending durability test and (iii) has residence heat stability for 40 minutes or more, and a molded article formed of the copolymer. According to the present invention, there can be provided a polyoxymethylene copolymer excellent in bending durability and heat stability and excellent in moldability, and a molded article formed thereof.Type: GrantFiled: October 15, 2002Date of Patent: September 9, 2003Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Takahiro Nakamura, Masanori Furukawa, Akira Okamura, Daigo Nakaya, Isamu Masumoto
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Publication number: 20030125512Abstract: A polyoxymethylene copolymer which is a polyoxymethylene copolymer obtained by copolymerizing trioxane and 8 to 20 mol, per 100 mol of the trioxane, of 1,3-dioxolane and which (i) has a crystallization time period of 10 to 2,000 seconds at 143° C., (ii) withstands 30 to 1,000 cycles of a bending durability test and (iii) has residence heat stability for 40 minutes or more, and a molded article formed of the copolymer.Type: ApplicationFiled: October 15, 2002Publication date: July 3, 2003Inventors: Takahiro Nakamura, Masanori Furukawa, Akira Okamura, Daigo Nakaya, Isamu Masumoto
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Patent number: 6468654Abstract: A treating agent comprises a nitrile group-containing highly saturated polymer rubber latex (A) having an iodine value of 120 or less, a rubber latex (B) other than the highly saturated polymer rubber latex, and a water-soluble resorcinol/formaldehyde condensate in amounts of 15 to 80%, 5 to 70% and 2 to 15%, all by weight in terms of solids, respectively. A rubber-reinforcing fiber product is coated with the treating agent. A rubber article such as a toothed belt, a tire and the like is made using this rubber-reinforcing fiber product. The glass fiber product coated with the treating agent may be further coated with a halogen-containing polymer-based adhesive as a secondary treating agent. Thus, the treating agent exhibits a large bonding force between the reinforcing fiber product and a matrix. Even if the rubber article is repeatedly subjected to a flexing stress, the strength thereof cannot be reduced. A peel-off cannot occurs between the reinforcing fiber product and the rubber matrix.Type: GrantFiled: August 13, 1998Date of Patent: October 22, 2002Assignee: Nippon Glass Fiber Co., Ltd.Inventors: Akira Okamura, Masato Sekiguchi