Patents by Inventor Yoshiyuki Udagawa
Yoshiyuki Udagawa 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: 9145485Abstract: A rubber composition that can be used in applications such as automotive tires and can improve the fuel efficiency performance and driving stability of automobiles and the like, a method for producing a rubber composition, and a tire using the same are provided.Type: GrantFiled: August 10, 2011Date of Patent: September 29, 2015Assignee: JSR CORPORATIONInventors: Koji Okada, Ryoji Tanaka, Yoshiyuki Udagawa
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Patent number: 8946349Abstract: A rubber composition that can be used in applications such as automotive tires and can improve the fuel efficiency performance and driving stability of automobiles and the like, a method for producing a rubber composition, and a tire using the same are provided.Type: GrantFiled: August 10, 2011Date of Patent: February 3, 2015Assignee: JSR CorporationInventors: Koji Okada, Ryoji Tanaka, Yoshiyuki Udagawa
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Publication number: 20130172481Abstract: A rubber composition that can be used in applications such as automotive tires and can improve the fuel efficiency performance and driving stability of automobiles and the like, a method for producing a rubber composition, and a tire using the same are provided.Type: ApplicationFiled: August 10, 2011Publication date: July 4, 2013Applicant: JSR CORPORATIONInventors: Koji Okada, Ryoji Tanaka, Yoshiyuki Udagawa
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Publication number: 20080295935Abstract: A rubber composition comprising: (A) a rubber component including 30 to 100 mass % of diene rubber having at least one functional group selected from the group consisting of an amino group, an alkoxysilyl group, an epoxy group, a hydroxyl group, and a carboxyl group in an amount of 0.01 to 5.0 mmol per 100 g of the diene rubber; (B) silica in an amount of 5 to 130 parts by mass per 100 parts by mass of the rubber component; and (C) an aliphatic component having at least one functional group selected from the group consisting of a carboxyl group, a hydroxyl group, an amino group, and an epoxy group in an amount of 3 to 15 parts by mass per 100 parts by mass of the silica. The rubber composition and a tire using the rubber composition exhibit excellent scorching properties before vulcanization and exhibit excellent rolling resistance and wet skid properties after vulcanization.Type: ApplicationFiled: August 3, 2005Publication date: December 4, 2008Applicant: JSR CORPORATIONInventors: Naokazu Kobayashi, Yoshiyuki Udagawa, Toshihiro Tadaki
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Patent number: 6977286Abstract: An objective of the invention is to provide a rubber composition which has satisfactory processability and dimension stability, and the like, gives a vulcanized rubber exhibiting excellent wearing resistance and tensile strength, and the like, and thus is useful in a belt, a hose and a tire and the like, as well as a crosslinked rubber particle for obtaining such rubber composition. A rubber composition of the invention comprises [1] a crosslinked rubber particle comprising as repeating units (a) 30 to 94.89% by weight of a conjugated diene unit, (b) 5 to 69.89% by weight of an aromatic vinyl unit, (c) 0.01 to 10% by weight of a monomer unit having at least two polymerizable unsaturated group, (d) one polymerizable unsaturated group and an amino group, a hydroxyl group and an epoxy group and (e) 0.Type: GrantFiled: January 23, 2004Date of Patent: December 20, 2005Assignee: JSR CorporationInventors: Tomohisa Konno, Toshihiro Tadaki, Yoshiyuki Udagawa, Hiroshi Akema
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Publication number: 20050182159Abstract: An objective of the present invention is to provide a production process capable of improving an operation efficiency of a diene-based rubber-inorganic compound composite during production by forming a composite having high dispersibility of an inorganic compound in a diene-based rubber and having relatively large crumb diameter upon coagulation. The present invention provides a process for producing a composite comprising a diene-based rubber and an inorganic compound represented by the general formula: wM.xSiOy.zH2O (where M is at least one metal element selected from the group consisting of Al, Mg, Ti and Ca, metal oxide thereof or metal hydroxide thereof, and w, x, y, and z are an integer of from 1 to 5, an integer of from 0 to 10, an integer of from 2 to 5, and an integer of from 0 to 10, respectively.), and comprises a step of mixing the inorganic compound and/or a material capable of forming the inorganic compound, an anionic compound and a dispersion liquid of the diene-based rubber.Type: ApplicationFiled: March 16, 2004Publication date: August 18, 2005Applicant: JRS CorporationInventors: Yoshiyuki Udagawa, Tsukasa Toyoshima, Toshihiro Tadaki
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Publication number: 20040152844Abstract: An objective of the invention is to provide a rubber composition which has satisfactory processability and dimension stability, and the like, gives a vulcanized rubber exhibiting excellent wearing resistance and tensile strength, and the like, and thus is useful in a belt, a hose and a tire and the like, as well as a crosslinked rubber particle for obtaining such rubber composition. A rubber composition of the invention comprises [1] a crosslinked rubber particle comprising as repeating units (a) 30 to 94.89% by weight of a conjugated diene unit, (b) 5 to 69.89% by weight of an aromatic vinyl unit, (c) 0.01 to 10% by weight of a monomer unit having at least two polymerizable unsaturated group, (d)one polymerizable unsaturated group and an amino group, a hydroxyl group and an epoxy group and (e) 0.Type: ApplicationFiled: January 23, 2004Publication date: August 5, 2004Applicant: JSR CorporationInventors: Tomohisa Konno, Toshihiro Tadaki, Yoshiyuki Udagawa, Hiroshi Akema
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Patent number: 6747095Abstract: An objective of the invention is to provide a rubber composition which has satisfactory processability and dimension stability, and the like, gives a vulcanized rubber exhibiting excellent wearing resistance and tensile strength, and the like, and thus is useful in a belt, a hose and a tire and the like, as well as a crosslinked rubber particle for obtaining such rubber composition. A rubber composition of the invention comprises [1] a crosslinked rubber particle comprising as repeating units (a) 30 to 94.89% by weight of a conjugated diene unit, (b) 5 to 69.89% by weight of an aromatic vinyl unit, (c) 0.01 to 10% by weight of a monomer unit having at least two polymerizable unsaturated group, (d) one polymerizable unsaturated group and an amino group, a hydroxyl group and an epoxy group and (e) 0.Type: GrantFiled: April 26, 2001Date of Patent: June 8, 2004Assignee: JSR CorporationInventors: Tomohisa Konno, Toshihiro Tadaki, Yoshiyuki Udagawa, Hiroshi Akema
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Patent number: 6740704Abstract: The object of the present invention is to provide a method for producing a diene-based rubber/inorganic compound complex capable of allowing a silicic acid compound including silica and the like to be dispersed uniformly and allowing a reinforcing effect to be exerted sufficiently, and a rubber composition containing said complex.Type: GrantFiled: December 11, 2001Date of Patent: May 25, 2004Assignee: JSR CorporationInventors: Tomohisa Konno, Yoshiyuki Udagawa, Toshihiro Tadaki
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Patent number: 6727307Abstract: A rubber composition comprises a polar group-containing diene polymer synthesized through an emulsion polymerization as a rubber component, and an inorganic filler represented by a formula of mM.xSiOy.zH2O wherein M is a metal selected from the group consisting of aluminum, magnesium, titanium and calcium, an oxide or a hydroxide of such a metal or an hydrate thereof, m is an integer of 1 to 5, x is an integer of 0 to 10, y is an integer of 2 to 5 and z is an integer of 0 to 10.Type: GrantFiled: December 21, 2001Date of Patent: April 27, 2004Assignees: Bridgestone Corporation, JSR CorporationInventors: Hajime Kondo, Kazuhiro Yanagisawa, Tomohisa Konno, Yoshiyuki Udagawa, Toshihiro Tadaki
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Patent number: 6703470Abstract: An objective of the invention is to provide a conjugated diene-based rubber having a specific composition and an oil extended rubber using the same, as well as a rubber composition capable of being converted into a vulcanized rubber which has a low rolling resistance, an excellent wearing resistance and the like, and is useful for a tire or the like. A conjugated diene-based rubber in the invention has repeating units consisting of 1 to 30% by mass of an olefinically unsaturated nitrile monomer unit such as acrylonitrile, 10 to 50% by mass of an aromatic vinyl monomer unit such as styrene, 19.9 to 88.9% by mass of a conjugated diene monomer unit such as 1,3-butadiene and 0.1 to 10% by mass of a monomer unit having one polymerizable unsaturated group and at least one functional group selected from the group consisting of an amino group, a hydroxyl group, an epoxy group, a carboxyl group and an alkoxysilyl group, and has a specific glass transition point and a Mooney viscosity [ML1+4(100° C.Type: GrantFiled: August 29, 2001Date of Patent: March 9, 2004Assignee: JSR CorporationInventors: Tomohisa Konno, Yoshiyuki Udagawa, Toshihiro Tadaki
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Patent number: 6699935Abstract: It is an object of the present invention to provide a rubber composition which can give a vulcanized rubber with low rolling resistance and excellent wet skid resistance and wear resistance, which is particularly useful for automobile tire treads and the like. The rubber composition of the invention comprises (1) a crosslinked rubber particle containing, as repeating units, 40 to 79.99% by weight of a monomer unit formed by a conjugated diene such as 1,3-butadiene, 20 to 50% by weight of a monomer unit formed by an aromatic vinyl monomer such as styrene and 0.01 to 10% by weight of a monomer unit formed by a monomer having at least two polymerizable unsaturated groups such as divinylbenzene, and (2) a conjugated diene/aromatic vinyl copolymeric rubber whose vinyl content of the conjugated diene monomer unit is 10 to 30% and whose 1,4-trans bond content is more than 55%, such as styrene-butadiene copolymeric rubber.Type: GrantFiled: February 28, 2002Date of Patent: March 2, 2004Assignee: JSR CorporationInventors: Hiroshi Akema, Toshihiro Tadaki, Yoshiyuki Udagawa, Tomohisa Konno, Takafumi Fueki, Hajime Kondou
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Publication number: 20040030027Abstract: The invention provides a diene-based rubber-inorganic compound composite material comprising a diene-based rubber and at least one inorganic compound selected from silica and a compound represented by the following formula (I):Type: ApplicationFiled: March 10, 2003Publication date: February 12, 2004Inventors: Tomohisa Konno, Yoshiyuki Udagawa, Toshihiro Tadaki, Hajime Kondo, Kazuhiro Yanagisawa
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Patent number: 6653404Abstract: A rubber composition having satisfactory processability and dimension stability, exhibits excellent tensile strength and wearing resistance when vulcanized and comprises (1) a crosslinked rubber particle containing as repeating units (a) 39.89 to 79.89% by weight of a conjugated diene unit such as 1,3-butadiene or the like, (b) 20 to 60% by weight of an aromatic vinyl unit such as styrene, (c) 0.01 to 10% by weight of a monomer unit having at least two polymerizable unsaturated group such as divinylbenzene, and the like, and (d) 0.1 to 30% by weight of a monomer unit having one polymerizable unsaturated group and an amino group such as vinylbenzylmethylamine, and the like and (2) a conjugated diene/aromatic vinyl copolymeric rubber such as styrene-butadiene copolymeric rubber and the like.Type: GrantFiled: April 30, 2001Date of Patent: November 25, 2003Assignee: JSR CorporationInventors: Tomohisa Konno, Toshihiro Tadaki, Yoshiyuki Udagawa, Hiroshi Akema
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Publication number: 20030125467Abstract: It is an object of the present invention to provide a rubber composition which can give a vulcanized rubber with low rolling resistance and excellent wet skid resistance and wear resistance, which is particularly useful for automobile tire treads and the like.Type: ApplicationFiled: February 28, 2002Publication date: July 3, 2003Inventors: Hiroshi Akema, Toshihiro Tadaki, Yoshiyuki Udagawa, Tomohisa Konno, Takafumi Fueki, Hajime Kondou
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Patent number: 6562929Abstract: An objective of the invention is to provide a conjugated diene-based rubber having a specific composition and a method of producing the same, an oil extended rubber using the same, as well as a rubber composition capable of being converted into a vulcanized rubber which has a low rolling resistance, an excellent wearing resistance and the like, and is useful, for example, as a tire or the like. A conjugated diene-based rubber in the invention has a glass transition point of −60 to 0° C., an olefinically unsaturated nitrile monomer unit randomly contains in its molecular chain, its repeating units consists of 9 to 30% by mass of an olefinically unsaturated nitrile monomer unit such as acrylonitrile, 10 to 50% by mass of an aromatic vinyl monomer unit such as styrene and 20 to 81% by mass of a conjugated diene monomer unit such as 1,3-butadiene, and its Mooney viscosity [ML1+4(100° C.)] is 20 to 200.Type: GrantFiled: August 29, 2001Date of Patent: May 13, 2003Assignee: JSR CorporationInventors: Tomohisa Konno, Yoshiyuki Udagawa, Toshihiro Tadaki
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Patent number: 6559219Abstract: A rubber composition of the invention comprises [1] a cross inked rubber particle component whose toluene-insolubles is 50% by weight or more and whose number mean particle size is 3 to 1000 nm and [2] a non-crosslinked rubber component whose toluene-insolubles is less than 20% by weight. This crosslinked rubber particle component is a polymer comprising at least one selected from (1) a conjugated diene unit, (2) a conjugated diene unit and an &agr;,&bgr;-unsaturated nitrile unit and (3) a conjugated diene unit and an acrylate unit as well as a monomer unit having at least 2 polymerizable unsaturated groups. The non-crosslinked rubber component described above is a polymer co rising at least one selected from (a) a conjugated diene unit, (b) (a) plus an aromatic vinyl unit, (c) (a) plus an &agr;,&bgr;-unsaturated nitrile unit, (d) (a) plus an acrylate unit and (e) an ethylene unit and an &agr;-olefin unit having 3 to 12 carbon atoms.Type: GrantFiled: April 27, 2001Date of Patent: May 6, 2003Assignee: JSR CorporationInventors: Toshihiro Tadaki, Tomohisa Konno, Yoshiyuki Udagawa, Hiroshi Akema
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Publication number: 20030008954Abstract: An objective of the invention is to provide a rubber composition which has satisfactory processability and dimension stability, and the like gives a vulcanized rubber exhibiting excellent wearing resistance and tensile strength, and the like and thus is useful in a belt, a hose and a tire, and the like. A rubber composition of the invention comprises [1] a crosslinked rubber particle component whose toluene-insolubles is 50 % by weight or more and whose number mean particle size is 3 to 1000 nm and [2] a non-crosslinked rubber component whose toluene-insolubles is less than 20 % by weight. This crosslinked rubber particle component is a polymer comprising at least one selected from (1) a conjugated diene unit, (2) a conjugated diene unit and an a, -unsaturated nitrile unit and (3) a conjugated diene unit and an acrylate unit as well as a monomer unit having at least 2 polymerizable unsaturated groups.Type: ApplicationFiled: April 27, 2001Publication date: January 9, 2003Applicant: JSR CorporationInventors: Toshihiro Tadaki, Tomohisa Konno, Yoshiyuki Udagawa, Hiroshi Akema
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Publication number: 20020156169Abstract: A rubber composition comprises a polar group-containing diene polymer synthesized through an emulsion polymerization as a rubber component, and an inorganic filler represented by a formula of mM.xSiOy.zH2O wherein M is a metal selected from the group consisting of aluminum, magnesium, titanium and calcium, an oxide or a hydroxide of such a metal or an hydrate thereof, m is an integer of 1 to 5, x is an integer of 0 to 10, y is an integer of 2 to 5 and z is an integer of 0 to 10.Type: ApplicationFiled: December 21, 2001Publication date: October 24, 2002Applicant: BRIDGESTONE CORPORATIONInventors: Hajime Kondo, Kazuhiro Yanagisawa, Tomohisa Konno, Yoshiyuki Udagawa, Toshihiro Tadaki
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Publication number: 20020111418Abstract: The object of the present invention is to provide a method for producing a diene-based rubber/inorganic compound complex capable of allowing a silicic acid compound including silica and the like to be dispersed uniformly and allowing a reinforcing effect to be exerted sufficiently, and a rubber composition containing said complex.Type: ApplicationFiled: December 11, 2001Publication date: August 15, 2002Applicant: JSR CorporationInventors: Tomohisa Konno, Yoshiyuki Udagawa, Toshihiro Tadaki