Patents by Inventor Masahiro Ikawa
Masahiro Ikawa 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: 7459212Abstract: A thermoplastic resin elastomer/rubber laminate comprising a rubber layer containing 100 parts by weight of a rubber and 0.1-20 parts by weight of an antioxidant preblended thereto and a thermoplastic resin elastomer composition layer, obtained by laminating at least two layers of the rubber layer and the thermoplastic resin elastomer composition layer followed by heating and pressing, whereby the antioxidant migrates from the rubber layer to the thermoplastic resin elastomer composition layer to improve the weathering resistance as well as a pneumatic tire using the same as an inner liner.Type: GrantFiled: December 24, 2004Date of Patent: December 2, 2008Assignee: The Yokohama Rubber Co., Ltd.Inventors: Kazuto Yamakawa, Masahiro Ikawa, Daisuke Kanenari, Yuichi Hara
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Publication number: 20060182976Abstract: A thermoplastic resin elastomer/rubber laminate comprising a rubber layer containing 100 parts by weight of a rubber and 0.1-20 parts by weight of an antioxidant preblended thereto and a thermoplastic resin elastomer composition layer, obtained by laminating at least two layers of the rubber layer and the thermoplastic resin elastomer composition layer followed by heating and pressing, whereby the antioxidant migrates from the rubber layer to the thermoplastic resin elastomer composition layer to improve the weathering resistance as well as a pneumatic tire using the same as an inner liner.Type: ApplicationFiled: December 24, 2004Publication date: August 17, 2006Inventors: Kazuto Yamakawa, Masahiro Ikawa, Daisuke Kanenari, Yuichi Hara
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Patent number: 6908958Abstract: An organically modified layered clay ionically bonded with an organic compound having an ammonium group and an amino group, an organic polymer composition containing the same and an organic polymer capable of reacting with the amino group, and an inner liner using the same.Type: GrantFiled: March 26, 2003Date of Patent: June 21, 2005Assignee: The Yokohama Rubber Co., Ltd.Inventors: Tsukasa Maruyama, Kazunori Ishikawa, Naoya Amino, Masahiro Ikawa
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Patent number: 6809157Abstract: A thermoplastic polymer having a carbonyl-containing group and a nitrogen-containing 5-membered heterocycle-containing group in side chains, and a composition thereof. The thermoplastic polymer and composition thereof have excellent recycle property in that physical properties do not deteriorate even though formation of crosslinking and dissociation of crosslinking are repeatedly conducted with altering temperature. The thermoplastic polymer and composition thereof are that its crosslinked structure is considerably stable at room temperature, and therefore have considerably high tensile strength. In particular, in the case of bonding to a main chain at 3-position or 4-position of a nitrogen-containing 5-membered heterocycle, intermolecular hydrogen bond is caused, so that a cured product has high mechanical properties.Type: GrantFiled: June 19, 2001Date of Patent: October 26, 2004Assignee: The Yokohama Rubber Co., Ltd.Inventors: Keisuke Chino, Makoto Ashiura, Tetsuji Kawazura, Masahiro Ikawa
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Patent number: 6746562Abstract: A thermo-reversible, crosslinkable elastomer, a composition containing the same, a rubber-bonded body and a rubber structure containing the rubber-bonded body are disclosed. The thermo-reversible, crosslinkable elastomer has an elastomer main-chain and a crosslinkable portion having at least one group selected from the group consisting of acid anhydride group and hydroxyl group. The thermo-reversible, crosslinkable elastomer can form stable crosslinked structure at room temperature, thereby having rubber plasticity, show sufficient melt flowability at molding temperature of general thermoplastic resin, and repeatedly reproduce crosslinking formation and crosslinking dissociation.Type: GrantFiled: September 22, 2003Date of Patent: June 8, 2004Assignee: The Yokohama Rubber Co., LTDInventors: Keisuke Chino, Masahiro Ikawa, Junichiro Natori
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Publication number: 20040059060Abstract: A thermo-reversible, crosslinkable elastomer, a composition containing the same, a rubber-bonded body and a rubber structure containing the rubber-bonded body are disclosed. The thermo-reversible, crosslinkable elastomer has an elastomer main-chain and a crosslinkable portion having at least one group selected from the group consisting of acid anhydride group an hydroxyl group. The thermo-reversible, crosslinkable elastomer can form stable crosslinked structure at room temperature, thereby having rubber plasticity, show sufficient melt flowability at molding temperature of general thermoplastic resin, and repeatedly reproduce crosslinking formation and crosslinking dissociation.Type: ApplicationFiled: September 22, 2003Publication date: March 25, 2004Inventors: Keisuke Chino, Masahiro Ikawa, Junichiro Natori
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Publication number: 20030191224Abstract: An organically modified layered clay ionically bonded with an organic compound having an ammonium group and an amino group, an organic polymer composition containing the same and an organic polymer capable of reacting with the amino group, and an inner liner using the same.Type: ApplicationFiled: March 26, 2003Publication date: October 9, 2003Inventors: Tsukasa Maruyama, Kazunori Ishikawa, Naoya Amino, Masahiro Ikawa
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Patent number: 6617383Abstract: A thermoplastic elastomer composition of a structure of a thermoplastic resin (A) in which a rubber composition (B) is dispersed, where the stress at the time of 2.5% elongation of the stress-strain curve of the thermoplastic elastomer composition is 0.1 to 50 MPa and the ratio of the stress (M200) at −20° C. and 200% elongation and the stress (M100) at −20° C. and 100% elongation is 1.0<M200/M100<2.0, particularly a thermoplastic elastomer composition structured with the polyamide resin of the thermoplastic resin (A) in which the rubber composition (B) is dispersed, includes a polyamide plasticizer (C1) and/or a thermoplastic elastomer (C2), the ratio of composition being (A) 15 to 59% by weight, (B) 40 to 70% by weight (C1+C2), and 1 to 30% by weight and a tire using the same.Type: GrantFiled: March 27, 2001Date of Patent: September 9, 2003Assignee: The Yokohama Rubber Co., Ltd.Inventors: Masahiro Ikawa, Kazuto Yamakawa, Yuichi Hara, Daisuke Kanenari, Katsuhiro Tanaka, Yoshihiro Soeda
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Patent number: 6528595Abstract: A composition useful as a sealant, coating, a potting agent for a printed circuit board, a prepreg or an adhesive comprises a compound (A) wherein all or a part of the oxirane rings in an epoxy compound is replaced with thiirane rings represented by the following formula (1): or compound (A) and compound (B) which contains oxirane rings and no thiirane ring in the molecule, wherein the ratio of oxirane ring/thiirane ring is from 90/10 to 10/90.Type: GrantFiled: October 6, 2000Date of Patent: March 4, 2003Assignee: The Yokohama Rubber Co., Ltd.Inventors: Masahiro Ikawa, Hiroyuki Okuhira, Keisuke Chino
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Patent number: 6512051Abstract: An elastomer composition including an elastomer having a functional group, and a compound having a functional group, in which corresponding functional groups form a cross-link by at least one of an ionic bond, a hydrogen bond, and Diels-Alder reaction with temperatures, i.e., by heating, while the cross-link is cleaved at around room temperature, forming and cleaving of the cross-link being reversible.Type: GrantFiled: January 21, 1999Date of Patent: January 28, 2003Assignee: The Yokohama Rubber Co., Ltd.Inventors: Keisuke Chino, Masahiro Ikawa, Makoto Ashiura
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Publication number: 20020086952Abstract: An elastomer composition including an elastomer having a functional group, and a compound having a functional group, in which corresponding functional groups form a cross-link by at least one of an ionic bond, a hydrogen bond, and Diels-Alder reaction with temperatures, i.e., by heating, while the cross-link is cleaved at around room temperature, forming and cleaving of the cross-link being reversible.Type: ApplicationFiled: January 21, 1999Publication date: July 4, 2002Inventors: KEISUKE CHINO, MASAHIRO IKAWA, MAKOTO ASHIURA
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Patent number: 6372855Abstract: A modified polybutene(polyisobutylene) containing isobutylene repeating units and having, in the main chain, at the ends, and/or at the side chains of the polymer chain thereof, free radicals stable at a room temperature and in the presence of oxygen, or having a half-ester structure, amide structure, onium salt structure, or imide structure or acid anhydride residual group, as well as a rubber composition containing the same.Type: GrantFiled: August 19, 1999Date of Patent: April 16, 2002Assignee: The Yokohama Rubber Co., Ltd.Inventors: Keisuke Chino, Masahiro Ikawa, Hidekazu Onoi
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Publication number: 20020022700Abstract: A thermoplastic polymer having a carbonyl-containing group and a nitrogen-containing 5-membered heterocycle-containing group in side chains, and a composition thereof. The thermoplastic polymer and composition thereof have excellent recycle property in that physical properties do not deteriorate even though formation of crosslinking and dissociation of crosslinking are repeatedly conducted with altering temperature. The thermoplastic polymer and composition thereof are that its crosslinked structure is considerably stable at room temperature, and therefore have considerably high tensile strength. In particular, in the case of bonding to a main chain at 3-position or 4-position of a nitrogen-containing 5-membered heterocycle, intermolecular hydrogen bond is caused, so that a cured product has high mechanical properties.Type: ApplicationFiled: June 19, 2001Publication date: February 21, 2002Applicant: THE YOKOHAMA RUBBER CO., LTD.Inventors: Keisuke Chino, Makoto Ashiura, Tetsuji Kawazura, Masahiro Ikawa
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Patent number: 6334919Abstract: A polymer composition for a tire having an air permeation coefficient of 25×10−12 cc·cm/cm2·sec ·cmHg (at 30° C.) or less and a Young's modulus of 1 to 500 MPa, including (A) at least 10% by weight, based on the weight of the total polymer component, of at least one thermoplastic resin having an air permeation coefficient of not more than 25×10−12 cc·cm/cm2·sec·cmHg (at 30° C.) and a Young's modulus of more than 500 MPa and (B) at least 10% by weight, based on the total weight of the polymer component, of at least one elastomer component having an air permeation coefficient of more than 25×10−12 cc·cm/cm2·sec·cmHg (at 30° C.) and a Young's modulus of not more than 500 MPa, wherein the total amount (A)+(B) of the component (A) and the component (B) is not less than 30% by weight based on the weight of the total polymer component, and a pneumatic tire obtained therefrom.Type: GrantFiled: March 26, 1999Date of Patent: January 1, 2002Assignee: The Yokohama Rubber Co., Ltd.Inventors: Hidekazu Takeyama, Yoshihiro Soeda, Gou Kawaguchi, Tetsuji Kawazura, Osamu Ozawa, Giro Watanabe, Noriaki Kuroda, Masahiro Ikawa
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Publication number: 20010041762Abstract: A thermoplastic elastomer composition of a structure of a thermoplastic resin (A) in which a rubber composition (B) is dispersed, where the stress at the time of 2.5% elongation of the stress-strain curve of the thermoplastic elastomer composition is 0.1 to 50 MPa and the ratio of the stress (M200) at −20° C. and 200% elongation and the stress (M100) at −20° C. and 100% elongation is 1.0<M200/M100<2.0, particularly a thermoplastic elastomer composition structured with the polyamide resin of the thermoplastic resin (A) in which the rubber composition (B) is dispersed, includes a polyamide plasticizer (C1) and/or a thermoplastic elastomer (C2), the ratio of composition being (A) 15 to 59% by weight, (B) 40 to 70% by weight (C1+C2), and 1 to 30% by weight and a tire using the same.Type: ApplicationFiled: March 27, 2001Publication date: November 15, 2001Inventors: Masahiro Ikawa, Kazuto Yamakawa, Yuiti Hara, Daisuke Kanenari, Katsuhiro Tanaka, Yoshihiro Soeda
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Patent number: 6084015Abstract: A rubber composition comprising a diene rubber, a reinforcing agent and a compound containing radicals capable of being stably present at room temperature in the presence of oxygen in the molecule thereof, selected from the group consisting of nitroxide radicals, hydrazyl radicals, allyloxyl radicals, and trityl radicals and the analogues thereof or a compound having at least one substituent group selected from amino groups, isocyanate groups, hydroxyl groups, carboxyl groups, oxirane groups, and thiirane groups.Type: GrantFiled: June 24, 1998Date of Patent: July 4, 2000Assignee: The Yokohama Rubber Co., Ltd.Inventors: Keisuke Chino, Fumito Yatsuyanagi, Hiroyuki Kaido, Masahiro Ikawa, Masayoshi Ito
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Patent number: 6079465Abstract: A polymer composition for a tire having an air permeation coefficient of 25.times.10.sup.-12 cc.multidot.cm/cm.sup.2 .multidot.sec.multidot.cmHg (at 30.degree. C.) or less and a Young's modulus of 1 to 500 MPa, including (A) at least 10% by weight, based on the weight of the total polymer component, of at least one thermoplastic resin having an air permeation coefficient of not more than 25.times.10.sup.-12 cc.multidot.cm/cm.sup.2 .multidot.sec.multidot.cmHg (at 30.degree. C.) and a Young's modulus of more than 500 MPa and (B) at least 10% by weight, based on the total weight of the polymer component, of at least one elastomer component having an air permeation coefficient of more than 25.times.10.sup.-12 cc.multidot.cm/cm.sup.2 .multidot.sec.multidot.cmHg (at 30.degree. C.Type: GrantFiled: January 22, 1996Date of Patent: June 27, 2000Assignee: The Yokohama Rubber Co., Ltd.Inventors: Hidekazu Takeyama, Yoshihiro Soeda, Gou Kawaguchi, Tetsuji Kawazura, Osamu Ozawa, Giro Watanabe, Noriaki Kuroda, Masahiro Ikawa
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Patent number: 5738158Abstract: A pneumatic tire having an air permeation prevention layer composed of a thin film of a resin composition including at least 20% by weight of a thermoplastic polyester elastomer comprised of a block copolymer of polybutylene terephthalate and polyoxyalkylene diimide diacid at a weight ratio of polybutylene terephthalate/polyoxyalkylene diimide diacid of 85/15 or less.Type: GrantFiled: January 24, 1996Date of Patent: April 14, 1998Assignee: The Yokohama Rubber Co., Ltd.Inventors: Osamu Ozawa, Noriaki Kuroda, Jiro Watanabe, Masahiro Ikawa, Tetsuji Kawazura