Patents by Inventor Yoshiki Nakagawa
Yoshiki Nakagawa 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: 7141646Abstract: The present invention provides a method of purifying a vinyl polymer to be used as a component of a composition capable of undergoing hydrosilylation. The present invention provides a vinyl polymers obtainable by atom transfer radical polymerization can be purified economically and efficiently by adsorption treatment using an acidic adsorbent and a basic adsorbent combinedly, with the result that the reactivity in hydrosilylation thereof is improved. Thus, the polymers can be used as components in hydrosilylation reaction-susceptible compositions.Type: GrantFiled: May 14, 2001Date of Patent: November 28, 2006Assignee: Kaneka CorporationInventors: Kenichi Kitano, Yoshiki Nakagawa
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Publication number: 20060247376Abstract: The present invention provides a curable composition containing (A) a vinyl polymer (I) having a crosslinkable functional group and (B) an organic polymer (II) having a group reactive with an isocyanato group and having a different main chain structure from that of the component (A). It is possible to provide a composition having balanced physical properties in which characteristics of both the polymer (I) as the component (A) and the polymer (II) as the components (B) are exploited. Specifically, the present invention provides cured objects having high strength at break, and good heat resistance, weatherability, and oil resistance.Type: ApplicationFiled: May 19, 2004Publication date: November 2, 2006Applicant: KANEKA CORPORATIONInventors: Nobuhiro Hasegawa, Yoshiki Nakagawa
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Patent number: 7129294Abstract: A vinyl polymer which has at least one terminal functional group per molecule and has a ratio of weight average molecular weight to number average molecular weight of less than 1.8 as determined by gel permeation chromatography, said terminal functional group being a crosslinking silyl group, an alkenyl group, or a hydroxyl group.Type: GrantFiled: May 31, 2001Date of Patent: October 31, 2006Assignee: Kaneka CorporationInventors: Yoshiki Nakagawa, Kenichi Kitano, Masato Kusakabe
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Publication number: 20060205887Abstract: A composition comprising a vinyl polymer having a crosslinkable silyl group may suffer from a delay in curing after the storage. The present invention relates to the following items. A curable composition comprising, as an essential component, (I) a vinyl polymer, which has at least one crosslinkable silyl group at the terminus and also has a monomer containing a methyl ester group as a constituent unit. A sealant, a liquid gasket, and an adhesive, wherein the above curable composition is used. A polymer has at least one crosslinkable functional group at the terminus and also has a vinyl polymer as a main chain thereof, wherein 2% to 80% by weight of monomers based on the total monomers constituting the main chain is methyl acrylate. A curable composition with improved storage stability, which comprises the following two components as essential components: (a) a vinyl polymer having at least one crosslinkable silyl group; and (b) a compound having a methyl ester group other than the compound (a).Type: ApplicationFiled: January 19, 2004Publication date: September 14, 2006Inventors: Yoshiki Nakagawa, Nobuhiro Hasegawa, Yasuo Shimizu, Jiro Okai, Nao Fujita, Hitoshi Tamai, Ayako Yano
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Patent number: 7081494Abstract: The present invention has for its object to provide a curable composition which, despite its low viscosity, gives a cured product with a high gel fraction, low residual tack, low modulus, high elongation, and good flexibility. The present invention relates to a curable composition comprising the following two components: (A) a vinyl polymer having at least one crosslinking silyl group on the average per molecule: and (B) a photocurable substance, (C) an air oxidation-curable substance, (D) a high molecular plasticizer, (E) a reactive plasticizer or (F) a compound having one silanol group in its molecule and/or a compound capable of reacting with moisture to give a compound having one silanol group in the molecule.Type: GrantFiled: August 7, 2003Date of Patent: July 25, 2006Assignee: Kaneka CorporationInventors: Masayuki Fujita, Nobuhiro Hasegawa, Yoshiki Nakagawa
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Publication number: 20060160918Abstract: The present invention has for its object to provide a curable composition which, despite its low viscosity, gives a cured product with a high gel fraction, low residual tack, low modulus, high elongation, and good flexibility. The present invention relates to a curable composition comprising the following two components: (A) a vinyl polymer having at least one crosslinking silyl group on the average per molecule: and (B) a photocurable substance, (C) an air oxidation-curable substance, (D) a high molecular plasticizer, (E) a reactive plasticizer or (F) a compound having one silanol group in its molecule and/or a compound capable of reacting with moisture to give a compound having one silanol group in the molecule.Type: ApplicationFiled: March 17, 2006Publication date: July 20, 2006Applicant: Kaneka CorporationInventors: Masayuki Fujita, Nobuhiro Hasegawa, Yoshiki Nakagawa
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Publication number: 20060160973Abstract: An object of the present invention is to provide a process for producing a vinyl polymer terminated with a group having a polymerizable carbon-carbon double bond with improved stability of quality. The present invention provides a process for producing a vinyl polymer terminated with a group having a polymerizable carbon-carbon double bond, the process being characterized by adding a stable free radical compound as a polymerization inhibitor. By adding the stable free radical compound during production, it is possible to prevent an increase in viscosity and gelation of the polymer which are due to polymerization reaction of the terminal group having the polymerizable carbon-carbon double bond.Type: ApplicationFiled: December 19, 2003Publication date: July 20, 2006Inventors: Hajime Harada, Kenichi Kitano, Yoshiki Nakagawa
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Publication number: 20060155074Abstract: A sealing material, which comprises a curing product of a composition comprising (A) an acrylic polymer having at least one alkenyl group capable of undergoing hydrosilylation reaction, (B) a hydrosilyl group-containing compound and (C) a hydrosilylation catalyst as essential components, is suitable for use as cam cover seals and oil pan seals for automobile engines, fuel cell cooling medium seals, automobile wire harnesses seals, HDD cover gasket or vibration-insulating HDD cover gasket seals, etc.Type: ApplicationFiled: October 3, 2003Publication date: July 13, 2006Applicant: NOK CORPORATIONInventors: Masashi Kudo, Kenichi Fujimoto, Atsushi Koga, Yoshifumi Kojima, Osamu Ando, Yoshiki Nakagawa
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Publication number: 20060135709Abstract: The present invention is a curable composition comprising a vinyl polymer having at least one crosslinkable silyl group on average and a compound having an ?,?- or ?,?-diol structure in the molecule. The curable composition of the present invention can be used for obtaining a cured product which has superior weather resistance and heat resistance, and good rubber physical properties such as low stress and high elongation therefrom.Type: ApplicationFiled: June 3, 2004Publication date: June 22, 2006Inventors: Nobuhiro Hasegawa, Yoshiki Nakagawa
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Publication number: 20060128893Abstract: The present invention is constituted of a curable composition which comprises, as essential components, the following four components: (A) a vinyl polymer having at least one hydrosilylatable alkenyl group within the molecule, (B) a hydrosilyl group-containing compound, (C) a hydrosilylation catalyst, and (D) an aliphatic unsaturated bond-containing compound, and which may further comprise (E) an amine compound. Moreover, the present invention is constituted of a curable composition which comprises, as essential components, the following three components: (A) a vinyl polymer having at least one hydrosilylatable alkenyl group within the molecule, (B) a hydrosilyl group-containing compound, and (G) an organic compound having at least one hydrosilylatable alkenyl or alkynyl group within the molecule [other than the above-mentioned component (A)].Type: ApplicationFiled: February 6, 2006Publication date: June 15, 2006Applicant: Kaneka CorporationInventors: Nobuhiro Hasegawa, Yoshiki Nakagawa
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Patent number: 7056983Abstract: Processes for producing an AB block copolymer, an ABA block copolymer or a multiblock copolymer are provided, which comprises adding an alkenyl-containing polymer (I) to a living or to an atom transfer radical polymerization system or a living cationic polymerization system.Type: GrantFiled: April 28, 1999Date of Patent: June 6, 2006Assignee: Kaneka CorporationInventors: Yoshiki Nakagawa, Masayuki Fujita, Kenichi Kitano, Tomoki Hiiro, Katsuhiko Kimura
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Patent number: 7030194Abstract: To eliminate a halogen group of a halogen group-terminated vinyl polymer, the present invention provides a method to treat said polymer with an oxy anion compound to thereby eliminate a terminal halogen group easily. Thus, it is possible to improve the storage stability of the polymer or a curable composition comprising said polymer and to prevent various materials coming into contact with the reaction apparatus or the polymer from being corroded. In particular, it is possible to improve the storage stability of a crosslinkable silyl group-containing polymer.Type: GrantFiled: April 3, 2000Date of Patent: April 18, 2006Assignee: Kaneka CorporationInventors: Yoshiki Nakagawa, Kenichi Kitano, Nao Fujita
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Publication number: 20060079645Abstract: It is an object of the present invention to provide a curable composition having excellent heat resistance and weatherability and exhibiting high strength while maintaining rubber elasticity. The present invention relates to a curable composition containing a vinyl polymer (I) which has at least one crosslinkable silyl group and whose main chain is produced by living radical polymerization and a vinyl polymer (II) which has a crosslinkable silyl group and whose main chain is produced by free radical polymerization. The present invention also relates to a curable composition containing the following two components: a vinyl polymer (III) which has a crosslinkable silyl group and exhibits a glass transition temperature of less than 23° C. as determined with a differential scanning calorimeter and a vinyl polymer (IV) which has a crosslinkable silyl group and exhibits a glass transition temperature of 23° C. or more as determined with a differential scanning calorimeter.Type: ApplicationFiled: February 17, 2004Publication date: April 13, 2006Inventors: Nobuhiro Hasegawa, Yoshiki Nakagawa
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Patent number: 7026397Abstract: The present invention is constituted of a curable composition which comprises, as essential components, the following four components: (A) a vinyl polymer having at least one hydrosilylatable alkenyl group within the molecule, (B) a hydrosilyl group-containing compound, (C) a hydrosilylation catalyst, and (D) an aliphatic unsaturated bond-containing compound, and which may further comprise (E) an amine compound, or the following three components: (A) a vinyl polymer having at least one hydrosilylatable alkenyl group within the molecule, (B) a hydrosilyl group-containing compound, and (G) an organic compound having at least one hydrosilylatable alkenyl or alkynyl group within the molecule [other than the above-mentioned component (A)], or the following three components: (A) a vinyl polymer having at least one hydrosilylatable alkenyl group within the molecule, (B) a hydrosilyl group-containing compound, and (H) carbon black.Type: GrantFiled: February 8, 2001Date of Patent: April 11, 2006Assignee: Kaneka CorporationInventors: Nobuhiro Hasegawa, Yoshiki Nakagawa
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Publication number: 20060052563Abstract: This invention is related to a production method of a branched polymer which comprises polymerizing a macromonomer [I], said macromonomer [I] being a vinyl polymer obtainable by radical polymerization and terminally having one polymerizable carbon-carbon double bond-containing group per molecule. Furthermore, by producing the macromonomer by living radical polymerization, in particular atom transfer radical polymerization, it becomes possible to produce the above polymers or gels having a well controlled side chain molecular weights.Type: ApplicationFiled: August 9, 2005Publication date: March 9, 2006Applicant: Kaneka CorporationInventors: Yoshiki Nakagawa, Shigeki Ono, Masayuki Fujita, Kenichi Kitano
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Patent number: 6979716Abstract: This invention is related to a production method of a branched polymer which comprises polymerizing a macromonomer [I], said macromonomer [I] being a vinyl polymer obtainable by radical polymerization and terminally having one polymerizable carbon—carbon double bond-containing group per molecule. Furthermore, by producing the macromonomer by living radical polymerization, in particular atom transfer radical polymerization, it becomes possible to produce the above polymers or gels having well controlled side chain molecular weights.Type: GrantFiled: June 18, 1999Date of Patent: December 27, 2005Assignee: Kaneka CorporationInventors: Yoshiki Nakagawa, Shigeki Ono, Masayuki Fujita, Kenichi Kitano
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Publication number: 20050272882Abstract: The present invention provides a vinyl polymer with an epoxy group terminally introduced therein and an epoxy resin composition comprising (A) an epoxy resin and (B) a vinyl polymer which has a main chain produced by living radical polymerization and has a reactive functional group at a main chain terminus. A flexible epoxy resin composition can be obtained using these compounds. The invention further provides an epoxy resin composition having an epoxy group at a main chain terminus thereof.Type: ApplicationFiled: August 5, 2005Publication date: December 8, 2005Applicant: Kaneka CorporationInventors: Kenichi Kitano, Yoshiki Nakagawa, Masayuki Fujita
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Patent number: 6964999Abstract: A vinyl polymer having at least one terminal group of the general formula (1) per molecule; —OC(O)C(R)?CH2??(1) wherein R represents hydrogen or an organic group containing 1 to 20 carbon atoms; a curable composition containing said polymer; an aqueous emulsion containing either said polymer or said curable composition; a pressure sensitive adhesive composition and a pressure sensitive adhesive each comprising said curable composition or aqueous emulsion.Type: GrantFiled: March 1, 1999Date of Patent: November 15, 2005Assignee: Kaneka CorporationInventors: Yoshiki Nakagawa, Masayuki Fujita, Kenichi Kitano
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Publication number: 20050228128Abstract: It is an object of the present invention to provide a curable composition for molding which contains a vinyl polymer having excellent oil resistance, heat resistance, weatherability, etc., which can be cured by hydrosilylation, and which has improved mold release properties. Specifically, the curable composition of the present invention contains the following four components as essential components: (A) a vinyl polymer (I) containing at least one hydrosilylatable alkenyl group per molecule, (B) a hydrosilyl group-containing compound (II), (C) a hydrosilylation catalyst, and (D) a metal soap. As the metal soap, a metal stearate is preferable, and particularly, calcium stearate, magnesium stearate, or zinc stearate is preferable.Type: ApplicationFiled: July 17, 2003Publication date: October 13, 2005Applicant: KANEKA CORPORATIONInventors: Jun Kotani, Yoshiki Nakagawa
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Publication number: 20050222332Abstract: The present invention relates to a vinyl polymer terminated in a silanol group, a hydrolyzable silyl group or an acrylic functional group, to a method of producing a vinyl polymer having a hydrolyzable silyl group at one or more termini thereof which comprises reacting a vinyl polymer having a silanol group at one or more termini thereof with a silicon compound having two or more silicon atom-bound hydrolyzable groups, and a method of producing a vinyl polymer having an acrylic functional group at one or more termini thereof which comprises reacting a vinyl polymer having a silanol group at one or more termini thereof with a silicon compound represented by the general formula (3): XSiR2-G-O—C(O)C(L)=CH2 ??(3) wherein X is a hydrolyzable group.Type: ApplicationFiled: May 23, 2005Publication date: October 6, 2005Applicant: Kaneka CorporationInventors: Yoshiki Nakagawa, Kenichi Kitano, Masayuki Fujita