Patents by Inventor Ryuji Nakagawa
Ryuji 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: 9623705Abstract: The invention provides a method for producing a modified conjugated diene (co)polymer, the method including comprising: a modification reaction step including causing an organic silane compound to react with a conjugated diene (co)polymer having an active site at the active site, the organic silane compound having a characteristic group for forming a silanol group through hydrolysis and, in the vicinity of the characteristic group, (i) a functional group which binds the organic silane compound to the conjugated diene (co)polymer via addition to or substitution at the active site and which promotes reaction between the silanol group and a reinforcing filler after the addition or substitution reaction, or (ii) a functional group which promotes reaction between the silanol group and a reinforcing filler, and a hydrolyzation step performed after the modification reaction step; a modified conjugated diene (co)polymer having, at a molecular end of the conjugated diene (co)polymer, a silanol group, and a functionalType: GrantFiled: March 10, 2009Date of Patent: April 18, 2017Assignee: BRIDGESTONE CORPORATIONInventors: Ken Tanaka, Noriko Mori, Yuki Itoh, Yoichi Ozawa, Ryuji Nakagawa, Junko Matsushita, Shigeaki Matsuo, Kouji Masaki, Fumihiro Shiraishi, Fuminori Oota
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Patent number: 9393838Abstract: Provided are a pressure-sensitive adhesive composition comprising, as a rubber component, at least two modified rubbers modified with a polar functional group and having different modification rates with each other, a laminate body comprising (A) a resin film layer and (B) a rubber elastic body layer wherein they are adhered via (C) the said pressure-sensitive adhesive composition, and a pneumatic tire having the said laminate body as an inner liner layer; and thus, provided are the pressure-sensitive adhesive composition that can firmly bond between the resin film layer and the rubber elastic body layer while the laminate body obtained therefrom does not generate cracks at low temperature, the laminate body using the said pressure-sensitive adhesive composition, and the pneumatic tire.Type: GrantFiled: April 2, 2012Date of Patent: July 19, 2016Assignee: BRIDGESTONE CORPORATIONInventors: Takuya Ogasawara, Ryuji Nakagawa, Kotaro Hayakawa, Hideyuki Chiashi
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Patent number: 9045003Abstract: Provided is a pneumatic tire which is improved in a rolling resistance and a ride comfort in normal running without damaging a run flat durability. It is a pneumatic tire provided with a bead core, a carcass layer, a tread rubber layer, an inner liner, a side reinforcing layer and a bead filler, characterized by using a rubber composition (a) which contains (A) a rubber component and (B) a filler and which has a dynamic storage modulus (E?) of 10 MPa or less at a dynamic strain of 1% and 25° C. and a ? value of 5.0 or less in a loss tangent tan ? at 28 to 150° C. in the physical properties of the vulcanized rubber.Type: GrantFiled: December 28, 2009Date of Patent: June 2, 2015Assignee: BRIDGESTONE CORPORATIONInventors: Ryuji Nakagawa, Horihisa Kano
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Patent number: 9029462Abstract: The present invention provides an adhesive composition that may improve both adhesiveness to a film layer and adhesiveness to a rubber layer, and an adhesion method using the same, as well as a laminate and a tire. The adhesive composition according to the present invention includes a rubber component, at least 80 mass % of which rubber component is an epoxidized natural rubber.Type: GrantFiled: April 12, 2012Date of Patent: May 12, 2015Assignee: Bridgestone CorporationInventors: Takuya Ogasawara, Ryuji Nakagawa, Kotaro Hayakawa, Hideyuki Chiashi
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Patent number: 8809464Abstract: A method for preparing a functionalized polymer, the method comprising the steps of preparing a reactive polymer, and reacting the reactive polymer with a halosilane compound containing an amino group.Type: GrantFiled: August 17, 2012Date of Patent: August 19, 2014Assignee: Bridgestone CorporationInventors: Terrence E. Hogan, Steven Luo, Yoichi Ozawa, Junko Matsushita, Ryuji Nakagawa, Eiju Suzuki, Ken Tanaka
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Publication number: 20140087110Abstract: Provided are a pressure-sensitive adhesive composition comprising, as a rubber component, at least two modified rubbers modified with a polar functional group and having different modification rates with each other, a laminate body comprising (A) a resin film layer and (B) a rubber elastic body layer wherein they are adhered via (C) the said pressure-sensitive adhesive composition, and a pneumatic tire having the said laminate body as an inner liner layer; and thus, provided are the pressure-sensitive adhesive composition that can firmly bond between the resin film layer and the rubber elastic body layer while the laminate body obtained therefrom does not generate cracks at low temperature, the laminate body using the said pressure-sensitive adhesive composition, and the pneumatic tire.Type: ApplicationFiled: April 2, 2012Publication date: March 27, 2014Applicant: BRIDGESTONE CORPORATIONInventors: Takuya Ogasawara, Ryuji Nakagawa, Kotaro Hayakawa, Hideyuki Chiashi
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Publication number: 20140048194Abstract: The present invention provides an adhesive composition that may improve both adhesiveness to a film layer and adhesiveness to a rubber layer, and an adhesion method using the same, as well as a laminate and a tire. The adhesive composition according to the present invention includes a rubber component, at least 80 mass % of which rubber component is an epoxidized natural rubber.Type: ApplicationFiled: April 12, 2012Publication date: February 20, 2014Applicant: BRIDGESTONE CORPORATIONInventors: Takuya Ogasawara, Ryuji Nakagawa, Kotaro Hayakawa, Hideyuki Chiashi
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Publication number: 20140030537Abstract: The present invention provides an adhesive composition that may improve both adhesiveness to a film layer and adhesiveness to a rubber layer, and an adhesion method using the same, as well as a laminate and a tire. The adhesive composition according to the present invention includes: a rubber component containing a diene-based elastomer; and a compound having a polar functional group in its molecule.Type: ApplicationFiled: April 12, 2012Publication date: January 30, 2014Applicant: BRIDGESTONE CORPORATIONInventors: Takuya Ogasawara, Ryuji Nakagawa, Kotaro Hayakawa, Hideyuki Chiashi
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Patent number: 8507627Abstract: This invention relates to an aromatic vinyl compound-conjugated diene compound copolymer capable of giving excellent wear resistance and resistance to wet skid to a tire, and more particularly to an aromatic vinyl compound-conjugated diene compound copolymer obtained by an addition polymerization of an aromatic vinyl compound and a conjugated diene compound in the presence of a polymerization catalyst composition comprising at least one specified metallocene complex selected from the group consisting of a metallocene complex represented by the following general formula (I): (wherein M is a lanthanoid element, scandium or yttrium, and CpR is independently a non-substituted or substituted indenyl, and Ra to Rf are independently an alkyl group having a carbon number of 1-3 or a hydrogen atom, and L is a neutral Lewis base, and w is an integer of 0-3) and so on, wherein a content of cis-1,4 bond in a conjugated diene compound portion is not less than 80%.Type: GrantFiled: June 4, 2009Date of Patent: August 13, 2013Assignees: Bridgestone Corporation, RikenInventors: Ryuji Nakagawa, Junko Matsushita, Yoichi Ozawa, Shojiro Kaita, Olivier Tardif
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Patent number: 8410224Abstract: The method for producing a modified conjugated diene based (co)polymer, according to the present invention comprises (a) obtaining a primarily modified polymer by carrying out a primary modification reaction wherein at least one member selected from the group consisting of an alkoxysilane compound and a silanol compound is introduced into the active alkali metal terminal of a conjugated diene based (co)polymer having an active alkali metal terminal, and (b) obtaining a secondarily modified polymer (a modified conjugated diene based (co)polymer) by subjecting the above-obtained primarily modified polymer to reactions comprising (b1) and (b2). (b1): a reaction with a condensation accelerator comprising a metal element. (b2): a reaction with at least one member selected from the group consisting of inorganic acids and metal halides.Type: GrantFiled: March 21, 2008Date of Patent: April 2, 2013Assignees: JSR Corporation, Bridgestone CorporationInventors: Takaomi Matsumoto, Masahiro Shibata, Takuo Sone, Toshihiro Tadaki, Ken Tanaka, Ryuji Nakagawa
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Patent number: 8258332Abstract: A method for preparing a functionalized polymer, the method comprising the steps of preparing a reactive polymer, and reacting the reactive polymer with a halosilane compound containing an amino group.Type: GrantFiled: June 18, 2008Date of Patent: September 4, 2012Assignee: Bridgestone CorporationInventors: Terrence E. Hogan, Steven Luo, Yoichi Ozawa, Junko Matsushita, Ryuji Nakagawa, Eiju Suzuki, Ken Tanaka
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Patent number: 8232352Abstract: There are provided a rubber composition simultaneously improving low loss factor and wear resistance as compared with the conventional ones as well as a tire using such a rubber composition. The invention lies in a rubber composition using a modified conjugated diene rubber and being excellent in the low loss factor and wear resistance as well as a tire. The rubber composition of the invention is formed by compounding a filler to a rubber component containing (A) a modified conjugated diene rubber having a cis-bond content in conjugated diene portion of not less than 87% and a vinyl bond content of not more than 2% and containing a functional group reactive with a filler and (B) a modified polymer having a modifying functional group number per 1 molecule of an unmodified polymer of not less than 0.6.Type: GrantFiled: June 10, 2008Date of Patent: July 31, 2012Assignee: Bridgestone CorporationInventors: Junko Matsushita, Yoichi Ozawa, Ryuji Nakagawa
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Patent number: 8143517Abstract: An extra-fine copper alloy twisted wire including a plurality of copper alloy wires with a wire diameter of 0.010 to 0.025 mm twisted together, each of the copper alloy wires including 1 to 3 weight % of silver (Ag) and a balance consisting of a copper and an inevitable impurity, the copper alloy twisted wire further including a tensile strength of not less than 850 MPa, and an electrical conductivity of not less than 85% IACS. The extra-fine copper alloy twisted wire includes a solid insulation with a thickness of not more than 0.07 mm formed on an outer circumference of the extra-fine insulated wire.Type: GrantFiled: April 8, 2009Date of Patent: March 27, 2012Assignee: Hitachi Cable, Ltd.Inventors: Huang Detian, Hiromitsu Kuroda, Hakaru Matsui, Osamu Seya, Ryohei Okada, Shinichi Masui, Ryuji Nakagawa, Hiroshi Okikawa
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Publication number: 20110290396Abstract: Provided is a pneumatic tire which is improved in a rolling resistance and a ride comfort in normal running without damaging a run flat durability. It is a pneumatic tire provided with a bead core, a carcass layer, a tread rubber layer, an inner liner, a side reinforcing layer and a bead filler, characterized by using a rubber composition (a) which contains (A) a rubber component and (B) a filler and which has a dynamic storage modulus (E?) of 10 MPa or less at a dynamic strain of 1% and 25° C. and a ? value of 5.0 or less in a loss tangent tan ? at 28 to 150° C. in the physical properties of the vulcanized rubber.Type: ApplicationFiled: December 28, 2009Publication date: December 1, 2011Applicant: BRIDGESTONE CORPORATIONInventors: Ryuji Nakagawa, Horihisa Kano
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Publication number: 20110160388Abstract: A process for producing a modified conjugated diene-based copolymer comprising bringing a modifier into reaction with the active end of a copolymer of a conjugated diene compound and an aromatic vinyl compound having the active end, wherein a compound having (i) a hydrolyzable functional group having silicon and (ii) a group which can be converted into a protonic amino group or a protonic amino group protected with an eliminable functional group after the reaction is used as the modifier, a step of adding a condensation catalyst is conducted after the modifier is brought into the reaction, and the content of the unit of the aromatic vinyl compound and the structure of the chain of the aromatic vinyl compound are specified.Type: ApplicationFiled: April 28, 2009Publication date: June 30, 2011Applicant: Bridgestone CorporationInventors: Ken Tanaka, Yoichi Ozawa, Ryuji Nakagawa, Takuo Sone, Takaimi Matsumoto, Yutaka Nagata
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Publication number: 20110146877Abstract: The invention provides a method for producing a modified conjugated diene (co)polymer, the method including comprising: a modification reaction step including causing an organic silane compound to react with a conjugated diene (co)polymer having an active site at the active site, the organic silane compound having a characteristic group for forming a silanol group through hydrolysis and, in the vicinity of the characteristic group, (i) a functional group which binds the organic silane compound to the conjugated diene (co)polymer via addition to or substitution at the active site and which promotes reaction between the silanol group and a reinforcing filler after the addition or substitution reaction, or (ii) a functional group which promotes reaction between the silanol group and a reinforcing filler, and a hydrolyzation step performed after the modification reaction step; a modified conjugated diene (co)polymer having, at a molecular end of the conjugated diene (co)polymer, a silanol group, and a functionalType: ApplicationFiled: March 10, 2009Publication date: June 23, 2011Applicant: BRIDGESTONE CORPORATIONInventors: Ken Tanaka, Noriko Mori, Yuki Itoh, Yoichi Ozawa, Ryuji Nakagawa, Junko Matsushita, Shigeaki Matsuo, Kouji Masaki, Fumihiro Shiraishi, Fuminori Oota
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Publication number: 20110136995Abstract: This invention relates to an aromatic vinyl compound-conjugated diene compound copolymer capable of giving excellent wear resistance and resistance to wet skid to a tire, and more particularly to an aromatic vinyl compound-conjugated diene compound copolymer obtained by an addition polymerization of an aromatic vinyl compound and a conjugated diene compound in the presence of a polymerization catalyst composition comprising at least one specified metallocene complex selected from the group consisting of a metallocene complex represented by the following general formula (I): (wherein M is a lanthanoid element, scandium or yttrium, and CpR is independently a non-substituted or substituted indenyl, and Ra to Rf are independently an alkyl group having a carbon number of 1-3 or a hydrogen atom, and L is a neutral Lewis base, and w is an integer of 0-3) and so on, wherein a content of cis-1,4 bond in a conjugated diene compound portion is not less than 80%.Type: ApplicationFiled: June 4, 2009Publication date: June 9, 2011Applicants: BRIDGESTONE CORPORATION, RIKENInventors: Ryuji Nakagawa, Junko Matsushita, Yoichi Ozawa, Shojiro Kaita, Olivier Tardif
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Patent number: 7919571Abstract: This invention provides a polybutadiene capable of improving wear resistance and resistance to crack growth in a rubber composition and a tire, wherein values of e, f and g derived from the following determinant (I): ( 1.7455 0 - 0.0151 - 0.0454 0.4292 - 0.0129 - 0.007 0 0.3746 ) ? ( log 10 ? ( a / d ) log 10 ? ( a / b ) log 10 ? ( a / c ) ) = ( e f g ) ( I ) (wherein a is a mountain peak value around 1130 cm?1 in a transmittance spectrum through Fourier transform infrared spectroscopy (FT-IR), and b is a valley peak value around 967 cm?1, and c is a valley peak value around 911 cm?1, and d is a valley peak value around 736 cm?1) satisfy relationships of equation (II): (Calculated value of cis-1,4 bond)=e/(e+f+g)×100?99 and equation (III): (Calculated value of vinyl bond)=g/(e+f+g)×100?0.Type: GrantFiled: May 19, 2008Date of Patent: April 5, 2011Assignees: Bridgestone Corporation, RikenInventors: Ryuji Nakagawa, Junko Matsushita, Yoichi Ozawa, Shojiro Kaita, Olivier Tardif
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Patent number: 7879952Abstract: A method for preparing a functionalized polymer, the method comprising the steps of (i) polymerizing conjugated diene monomer by employing a lanthanide-based catalyst to form a reactive polymer, and (ii) reacting the reactive polymer with an azine compound.Type: GrantFiled: December 19, 2006Date of Patent: February 1, 2011Assignee: Bridgestone CorporationInventors: Steven Luo, Ryuji Nakagawa, Jason T. Poulton, Eiju Suzuki, Yuan-Yong Yan
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Publication number: 20100317818Abstract: A method for preparing a functionalized polymer, the method comprising the steps of preparing a reactive polymer, and reacting the reactive polymer with a halosilane compound containing an amino group.Type: ApplicationFiled: June 18, 2008Publication date: December 16, 2010Inventors: Terrence Hogan, Steven Luo, Yoichi Ozawa, Junko Matsushita, Ryuji Nakagawa, Ken Tanaka, Eiju Susuki