Patents Assigned to Arakawa Chemical Industries, Ltd.
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Patent number: 6525160Abstract: The present invention provides an epoxy resin composition which comprises an alkoxy-containing silane-modified epoxy resin (A) which is obtainable by dealcoholization condensation reaction between a bisphenol epoxy resin (1) and hydrolyzable alkoxysilane (2); and a curing agent (B) for epoxy resin. The present invention also provides a method for preparing an alkoxy-containing silane-modified epoxy resin, the method comprising dealcoholization condensation reaction between the bisphenol epoxy resin (1) and the hydrolyzable alkoxysilane (2).Type: GrantFiled: January 12, 2001Date of Patent: February 25, 2003Assignee: Arakawa Chemical Industries Ltd.Inventors: Hideki Goda, Tetsuji Higashino
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Patent number: 6506868Abstract: The present invention provides a partial condensate of glycidyl ether group-containing alkoxysilane which is obtainable by dealcoholization reaction between glycidol and a partial condensate of alkoxysilane, compositions comprising the same and preparation methods thereof. Further, the present invention provides an alkoxy-containing silane-modified polyimide resin, alkoxy-containing silane-modified polyamide-imide resin and alkoxy-containing silane-modified phenol resin which are modified with the partial condensate of glycidyl ether group-containing alkoxysilane, and preparation methods thereof.Type: GrantFiled: March 7, 2001Date of Patent: January 14, 2003Assignee: Arakawa Chemical Industries, Ltd.Inventors: Hideki Goda, Shoji Takeda, Tetsuji Higashino
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Patent number: 6458902Abstract: Disclosed is a process for preparing a hydrogenated C9 petroleum resin, the process comprising hydrogenating a C9 petroleum resin obtained by polymerizing polymerizable monomers of a C9 fraction using a non-phenolic Friedel-Crafts catalyst in the presence or absence of a non-phenolic molecular weight modifier. The hydrogenated C9 petroleum resin obtained according to the present invention retains the characteristics of known hydrogenated C9 petroleum resins and has high thermal stability, good light resistance, and remarkably low fluorescence.Type: GrantFiled: May 8, 2000Date of Patent: October 1, 2002Assignee: Arakawa Chemical Industries, Ltd.Inventors: Takumi Okazaki, Eiji Nagahara, Hirokazu Keshi
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Patent number: 6441106Abstract: The present invention provides a curing agent for epoxy resin containing a siloxane-modified phenol resin (3) obtained by dealcoholization condensation reaction between a phenol resin (1) and a hydrolyzable alkoxysilane (2). The present invention further provides an epoxy resin composition comprising an epoxy resin and the above-mentioned curing agent for epoxy resin. The present invention further provides a method for preparing a siloxane-modified phenol resin (3) characterized by subjecting a phenol resin (1) and a hydrolyzable alkoxysilane (2) to dealcoholization condensation reaction.Type: GrantFiled: September 12, 2000Date of Patent: August 27, 2002Assignee: Arakawa Chemical Industries, Ltd.Inventors: Hideki Goda, Shoji Takeda
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Patent number: 6034183Abstract: A process for preparing polymers having quaternary ammonium groups comprising polymerizing a vinyl monomer component containing a vinyl monomer having a tertiary amino group in the presence of a specific solvent, while quaternizing the tertiary amino group with a quaternizing agent, to produce the vinyl polymers having quaternary ammonium groups in the form of particles dispersed in the solvent, which is possible to easily separate the produced polymers having quaternary ammonium groups from the solvent without requiring a heating step for removing the solvent, and which can produce quaternary ammonium group-containing copolymers having a high content of a hydrophobic vinyl monomer. The quaternary ammonium group-containing copolymers obtained by this process are useful as modifier for plastics, permanent antistatic agent, bactericide or fungicide, chemicals for paper making and water treating agent.Type: GrantFiled: June 8, 1998Date of Patent: March 7, 2000Assignee: Arakawa Chemical Industries, Ltd.Inventors: Tatsuya Okumura, Jiro Mizuya, Junji Shiigi
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Patent number: 5880240Abstract: An alkyl-containing porous resin with a specific surface area of 50 to 600 m.sup.2 /g, the resin being prepared by polymerizing a monomer mixture of, based on the total weight of the monomers, 15 to 97% by weight of divinylbenzene, 0 to 82% by weight of at least one aromatic monovinyl monomer selected from the group consisting of styrene, methylstyrene and ethylvinylbenzene and 3 to 50% by weight of a vinylbenzyloxyalkane derivative represented by the formula ##STR1## wherein n is an integer of 1 to 18, a process for its preparation and its use.The porous resin of the invention is capable of fully exhibit its modified functions based on the variations of chemical and structural environments on the surface of resin, the functions being modified by introducing alkyl groups having varying chain lengths.Type: GrantFiled: November 26, 1997Date of Patent: March 9, 1999Assignee: Arakawa Chemical Industries, Ltd.Inventor: Takaharu Tsuno
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Patent number: 5856386Abstract: A crystalline thermoplastic resin composition comprises a rosin acid metallic salt and a crystalline thermoplastic resin. Optionally, a compatibilizing agent may also be included. The rosin acid metallic salt, which acts as a crystal nucleating agent, increases the crystallization rate of the crystalline thermoplastic resin and enables the formation of fine crystals of the resin. Thus, the crystalline thermoplastic resin composition can crystallize at a high rate, and provide molded articles having excellent mechanical properties and/or optical properties.Type: GrantFiled: January 22, 1997Date of Patent: January 5, 1999Assignees: Mitsui Petrochemicals Industries, Ltd., Arakawa Chemical Industries, Ltd.Inventors: Hideki Sakai, Mikio Nakagawa, Tetsuji Kasai, Kimio Ueda, Masao Maeda, Yukiharu Yamada, Hiroyuki Hori, Junji Tan, Kan Matsumoto
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Patent number: 5808133Abstract: The invention provides an alicyclic bifunctional compound represented by the formula ##STR1## wherein R is a carboxyl group, a lower alkoxycarbonyl group or a hydroxymethyl group and n is 0 or 1.Type: GrantFiled: February 7, 1997Date of Patent: September 15, 1998Assignee: Arakawa Chemical Industries Ltd.Inventors: Takaharu Tsuno, Hideki Kobayashi
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Patent number: 5798201Abstract: A radiation sensitive resin composition containing an alkali soluble resin and a 1,2-quinonediazide compound of a polyphenol or a radiation sensitive resin composition containing an alkali soluble resin and a 1,2-quinonediazide compound and a polyphenol compound.Type: GrantFiled: July 2, 1997Date of Patent: August 25, 1998Assignees: Japan Synthetic Rubber Co., Ltd., Arakawa Chemical Industries, Ltd.Inventors: Katsumi Inomata, Nasahiro Akiyama, Toshiyuki Ota, Akira Tsuji
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Patent number: 5731395Abstract: A functional group-containing porous resin prepared by polymerization of a monomer mixture of, based on 100% by weight of the total amount of the monomers, 15 to 97% by weight of divinylbenzene, 0 to 82% by weight of at least one aromatic monovinyl monomer selected from the group consisting of styrene, methylstyrene and ethylvinylbenzene and 3 to 30% by weight of a vinylbenzyloxyalkyl derivative represented by the formula ##STR1## wherein n is an integer of 2 to 16 and A represents a hydroxyl group or a halogen atom, and a process for preparing the same. The above-mentioned porous resin of the invention can fully exhibit its function due to the marked presence of a functional group on the surface of the resin and/or in the neighborhood thereof.Type: GrantFiled: November 13, 1996Date of Patent: March 24, 1998Assignee: Arakawa Chemical Industries, Ltd.Inventor: Takaharu Tsuno
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Patent number: 5707558Abstract: A radiation sensitive resin composition containing an alkali soluble resin and a 1,2-quinonediazide compound of a polyphenol or a radiation sensitive resin composition containing an alkali soluble resin and a 1,2-quinonediazide compound and a polyphenol compound.Type: GrantFiled: October 2, 1995Date of Patent: January 13, 1998Assignees: Japan Synthetic Rubber Co., Ltd., Arakawa Chemical Industries, Ltd.Inventors: Katsumi Inomata, Nasahiro Akiyama, Toshiyuki Ota, Akira Tsuji
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Patent number: 5426246Abstract: Disclosed are a catalyst for directly reducing a carboxylic acid, the catalyst comprising a tin compound and a ruthenium compound supported on a carrier, the catalyst being prepared by the steps of calcining the tin compound in the presence of oxygen after deposition of the tin compound alone on the carrier, and activating the obtained product after deposition of the ruthenium compound on said carrier, a process for preparing the catalyst, and a process for preparing an alcohol compound using the catalyst.Type: GrantFiled: July 26, 1994Date of Patent: June 20, 1995Assignee: Arakawa Chemical Industries, Ltd.Inventors: Eiji Nagahara, Yasushi Itoi
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Patent number: 5367009Abstract: This invention provides a dispersing agent suitable for the production of an aqueous rosin emulsion which contains as an active ingredient a copolymer salt containing a certain oxyalkylene-containing monomer unit and a tertiary and/or quaternary nitrogen-containing monomer unit and a dispersing agent suited to the production of aqueous rosin emulsions which contains at least one member of units of quaternary nitrogen-containing monomer having a hydroxyl group, units of quaternary nitrogen-containing monomer having a vinylbenzyl group and units of quaternary nitrogen-containing monomer having a maleimide group and at least one member of hydrocarbon monomer units and (meth)acrylate ester monomer units.The invention further provides an aqueous rosin emulsion as prepared using the above dispersing agent and a sizing agent containing the emulsion as an active ingredient.Type: GrantFiled: December 9, 1991Date of Patent: November 22, 1994Assignee: Arakawa Chemical Industries Ltd.Inventors: Tetsuya Inoue, Yoshihiro Sasaki, Hirofumi Yoshimura
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Patent number: 5330582Abstract: A cleaning method for removing a rosin-base solder flux, the method including bringing a cleaning agent into contact with the flux on a printed wiring board, the cleaning agent including a mixture of(A) at least one glycol ether compound represented by the formula ##STR1## wherein R.sup.1 is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, R.sup.2 is an alkyl group having 1 to 5 carbon atoms, R.sup.3 is a hydrogen atom or a methyl group and n is an integer of 2 to 4, and(B) at least one nonionic surfactant.Type: GrantFiled: July 19, 1993Date of Patent: July 19, 1994Assignee: Arakawa Chemical Industries, Ltd.Inventors: Machio Chihara, Jiro Mizuya, Tatsuya Okumura, Takashi Tanaka
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Patent number: 5288782Abstract: The sizing agent of the invention contains a rosin substance, a dispersant and water in which an amphoteric, anionic or cationic copolymer is used as the dispersant, the copolymer being prepared by copolymerizing (A) a vinyl carboxylate as an essential monomer and (B) an anionic unsaturated monomer and/or (C) a cationic unsaturated monomer.Type: GrantFiled: April 26, 1993Date of Patent: February 22, 1994Assignee: Arakawa Chemical Industries Ltd.Inventors: Masato Nakajima, Itsuro Sakai, Nobuyuki Tani
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Patent number: 5256209Abstract: The invention provides a cleaning method for removing a rosin-base solder flux, using essentially a mixture of(A) a compound of the formula (1) ##STR1## wherein R.sup.1 is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, R.sup.2 is an alkyl group having 1 to 5 carbon atoms, R.sup.3 is a hydrogen atom or a methyl group and k is an integer of 2 to 4,(B) a compound represented by the formula (2)R.sup.4 --O--(CH.sub.2 CH.sub.2 O).sub.m --H (2)wherein R.sup.4 is a straight- or branched-chain alkyl group having 6 to 20 carbon atoms, phenyl group or a phenyl group substituted with a straight- or branched- chain alkyl group having 7 to 12 carbon atoms and m is an integer 2 to 20,(C) a compound represented by the formula (3) ##STR2## wherein R.sup.Type: GrantFiled: June 24, 1991Date of Patent: October 26, 1993Assignee: Arakawa Chemical Industries, Ltd.Inventors: Machio Chihara, Jiro Mizuya, Tatsuya Okumura, Takashi Tanaka
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Patent number: 5219653Abstract: The present invention provides an NMR diagnosis assisting sheet characterized in that the sheet comprises a molded body of a water-absorbing resin, the water-absorbing resin forming a uniform matrix phase wherein the molecules of the resin are interlocked with one another, and water absorbed by the resin is uniformly dispersed as chemically and/or physically bonded to the resin.Type: GrantFiled: November 22, 1991Date of Patent: June 15, 1993Assignee: Arakawa Chemical Industries, Ltd.Inventors: Daisaku Suga, Tsunemitsu Matsuda, Shozo Tanioku, Kenji Takeuchi
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Patent number: 5100949Abstract: This invention provides(i) an overcoating agent for heat-sensitive recording materials which contains as an active component an emulsion of a graft copolymer prepared by graft-copolymerizing an acrylamide or methacrylamide as a monomer (A), a methyl acrylate or methacrylate as a monomer (B), an acrylic or methacrylic acid as a monomer (C) and if required, a monomer other than said monomers as a monomer (D) which is copolymerizable therewith onto a polyvinyl alcohol in the presence of a fatty acid ester of sucrose and water, and(ii) an overcoating agent for heat-sensitive recording materials which contains as an active component an emulsion of a graft copolymer prepared by graft-copolymerizing a methyl acrylate or methacrylate as a monomer (E), a lower hydroxyalkyl acrylate or methacryalte as a monomer (F), an acrylic or methacrylic acid as a monomer (G) and if required, a monomer other than said monomers as a monomer (H) which is copolymerizable therewith onto a polyvinyl alcohol in the presence of a fatty acType: GrantFiled: November 8, 1989Date of Patent: March 31, 1992Assignee: Arakawa Chemical Industries, Ltd.Inventors: Nobuyuki Takahashi, Tetsuya Inoue, Mika Koda
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Patent number: 5096504Abstract: The invention provides a cleaning agent for removal of a rosin-base flux, the cleaning agent consisting essentially of a surfactant represented by the formulaR--O--(CH.sub.2 CH.sub.2 O).sub.n --H (I)wherein R is a straight or branched chain alkyl or alkenyl group having 5 to 18 carbon atoms and n is an integer of 2 to 12, and a cleaning method for removing a rosin-base flux, the method comprising bringing the cleaning agent into contact with a flux on a printed wiring board.Type: GrantFiled: June 15, 1990Date of Patent: March 17, 1992Assignee: Arakawa Chemical Industries, Ltd.Inventors: Machio Chihara, Jiro Mizuya, Tatsuya Okumura, Takashi Tanaka
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Patent number: 4962079Abstract: This invention provides an overcoat composition for a heat-sensitive record material comprising as an effective component thereof an emulsion of graft copolymer prepared by graft-copolymerizing methyl (meth)acrylate (A), a lower hydroxalkyl (meth)acrylate (B) and (meth)acrylic acid (C) with a polyvinyl alcohol in the presence of water and a neutralization salt of diisobutylene-maleic anhydride copolymer; a heat-sensitive record material having a heat-sensitive layer coated over its surface with an overcoat composition defined above; and a process for preparing a heat-sensitive record material comprising coating the surface of the heat-sensitive layer of a heat-sensitive record material with an overcoat composition defined above.Type: GrantFiled: December 19, 1988Date of Patent: October 9, 1990Assignees: Mitsubishi Paper Mills Limited, Arakawa Chemical Industries, Ltd.Inventors: Hisashi Matsumoto, Masaaki Takami, deceased, Nobuyuki Takahashi, Tetsuya Inoue