Patents by Inventor Kazushige Ishiura
Kazushige Ishiura 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: 8236417Abstract: A pressure-sensitive adhesive contains an acrylic triblock copolymer (I) at not less than 60% by mass based on the total mass of all solids contained in the pressure-sensitive adhesive, the acrylic triblock copolymer being represented by the formula A1-B-A2 wherein: A1 and A2 are each independently an alkyl methacrylate polymer block having Tg of not less than 100° C. and B is an acryl acrylate polymer block having Tg of not more than ?20° C.; the content of the polymer block B is 50 to 95% by mass; Mw is in the range of 50,000 to 300,000; and the molecular weight distribution is in the range of 1.0 to 1.5. Preferably, the acrylic triblock copolymer (I) is a combination of an acrylic triblock copolymer (Ia) having Mw of 50,000 to less than 100,000 and an acrylic triblock copolymer (Ib) having Mw of 100,000 to 300,000, in a mass ratio (Ia):(Ib) of 45:55 to 75:25.Type: GrantFiled: November 26, 2007Date of Patent: August 7, 2012Assignee: Kuraray Co., Ltd.Inventors: Yoshihiro Morishita, Kenichi Hamada, Tetsuya Kunimune, Kazushige Ishiura
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Patent number: 7973117Abstract: A continuous production process, for producing an (meth)acrylic ester (co)polymer comprises the step of continuously feeding an organoaluminum compound-containing polymerization initiator solution and an (meth)acrylic ester into a reactor to continuously obtain a living polymer-containing polymer reaction liquid. The {[molar quantity of methacrylic ester or acrylic ester]/([molar quantity of organoaluminum compound]?[molar quantity of polymerization initiator])} fed into the reactor is regulated to be 15 to 80, and the content of the (meth)acrylic ester in the total feed amount of a polymerization initiator solution and an (meth)acrylic ester fed into the reactor is regulated to not more than 5% by mass.Type: GrantFiled: August 11, 2005Date of Patent: July 5, 2011Assignee: Kuraray Co., Ltd.Inventors: Kenichi Hamada, Yoshihiro Morishita, Tatsufumi Watanabe, Kazushige Ishiura
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Patent number: 7718588Abstract: A lubricating oil additive containing at least one acrylic block copolymer having a weight-average molecular weight of 10,000 to 1,000,000 and a molecular weight distribution [ratio of weight-average molecular weight (Mw) to number-average molecular weight (Mn), i.e., Mw/Mn ratio] of 1.5 or below; and lubricating oil compositions containing the additive. The lubricating oil additive exhibits a thickening effect higher than those of conventional acrylic lubricating oil additives and can improve the viscosity index of lubricating oil even when added in a small amount. Further, the additive can also improve the low-temperature characteristics, flow characteristics, and shear stability. The lubricating oil compositions enable energy saving and can lengthen the lifetime of lubricating oil and reduce the load on the global environment.Type: GrantFiled: July 14, 2005Date of Patent: May 18, 2010Assignee: Kuraray Co., Ltd.Inventors: Yoshihiro Morishita, Noboru Higashida, Hidetaka Oonuma, Kenichi Hamada, Kazushige Ishiura
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Publication number: 20090305068Abstract: Pressure-sensitive adhesives for optical films exhibit high cohesion, excellent re-workability, adhesion properties, heat resistance and durability without chemical crosslinking. A pressure-sensitive adhesive contains an acrylic triblock copolymer (I) at not less than 60% by mass based on the total mass of all solids contained in the pressure-sensitive adhesive, the acrylic triblock copolymer being represented by the formula A1-B-A2 wherein: A1 and A2 are each independently an alkyl methacrylate polymer block having Tg of not less than 100° C. and B is an acryl acrylate polymer block having Tg of not more than ?20° C.; the content of the polymer block B is 50 to 95% by mass; Mw is in the range of 50,000 to 300,000; and the molecular weight distribution is in the range of 1.0 to 1.5.Type: ApplicationFiled: November 26, 2007Publication date: December 10, 2009Applicant: KURARAY CO., LTD.Inventors: Yoshihiro Morishita, Kenichi Hamada, Tetsuya Kunimune, Kazushige Ishiura
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Publication number: 20080139759Abstract: A continuous production process, which can allow polymerization to proceed at a milder polymerization temperature and a higher polymerization speed as compared with the conventional method while maintaining a high level of living properties and can produce an (meth)acrylic ester (co)polymer having a narrow molecular weight distribution in a high yield with good productivity. The continuous production process for producing an (meth)acrylic ester (co)polymer comprises the step of continuously feeding an organoaluminum compound-containing polymerization initiator solution and an (meth)acrylic ester into a reactor to continuously obtain a living polymer-containing polymer reaction liquid.Type: ApplicationFiled: August 11, 2005Publication date: June 12, 2008Applicant: Kuraray Co., Ltd.Inventors: Kenichi Hamada, Yoshihiro Morishita, Tatsufumi Watanabe, Kazushige Ishiura
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Patent number: 7358298Abstract: The present invention provides an adhesive composition containing a block copolymer, wherein the block copolymer has a polymer block (A) which is principally composed of a ?-methyl styrene unit, and a polymer block (B) which is principally composed of a conjugated diene unit and of which at least part of carbon-carbon unsaturated double bonds may be hydrogenated, and having a good holding power at high temperatures.Type: GrantFiled: September 21, 2004Date of Patent: April 15, 2008Assignee: Kuraray Co., Ltd.Inventors: Yoshihiro Morishita, Hiromichi Nakata, Kenichi Hamada, Kazushige Ishiura
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Publication number: 20080058234Abstract: A lubricating oil additive containing at least one acrylic block copolymer having a weight-average molecular weight of 10,000 to 1,000,000 and a molecular weight distribution [ratio of weight-average molecular weight (Mw) to number-average molecular weight (Mn), i.e., Mw/Mn ratio] of 1.5 or below; and lubricating oil compositions containing the additive. The lubricating oil additive exhibits a thickening effect higher than those of conventional acrylic lubricating oil additives and can improve the viscosity index of lubricating oil even when added in a small amount. Further, the additive can also improve the low-temperature characteristics, flow characteristics, and shear stability. The lubricating oil compositions enable energy saving and can lengthen the lifetime of lubricating oil and reduce the load on the global environment.Type: ApplicationFiled: July 14, 2005Publication date: March 6, 2008Applicant: Kuraray Co., Ltd.Inventors: Yoshihiro Morishita, Noboru Higashida, Hidetaka Oonuma, Kenichi Hamada, Kazushige Ishiura
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Patent number: 6894114Abstract: A block copolymer is obtained by anionic polymerization, includes two or more polymer blocks A miscible with each other, and at least one (meth)acrylic ester polymer block B immiscible with the polymer blocks A, has a ratio [Mn(Amax)/Mn(Amin)] of 2 or more, wherein the ratio [Mn(Amax)/Mn(Amin)] is the ratio of the largest number average molecular weight [Mn(Amax)] to the smallest number average molecular weight [Mn(Amin)] among the polymer blocks A, has at least one block bonding including polymer block Amax-polymer block B-polymer block Amin, and has a total content of the polymer blocks A ranging from 20 wt % to 45 wt % based on the total mass of the block copolymer. This invention provides block copolymers having two or more polymer blocks A miscible with each other and at least one (meth)acrylic ester polymer block B immiscible with the polymer blocks A and exhibiting satisfactory flexibility, melt fluidity, moldability, coatability, mechanical properties, and other properties.Type: GrantFiled: September 17, 2001Date of Patent: May 17, 2005Assignee: Kuraray Co., Ltd.Inventors: Masaji Kato, Kenichi Hamada, Kazushige Ishiura, Yoshihiro Morishita
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Patent number: 6878789Abstract: A process for the preparation of an acrylic acid ester polymer, includes carrying out polymerization of an acrylic acid ester or block copolymerization of an acrylic acid ester and another (meth)acrylic monomer in the presence of an organolithium compound and an organoaluminum compound represented by the following formula (I): AlR1R2R3??(I) wherein R1 represents an alkyl group having at least 3 carbon atoms, an alkoxy group having at least 3 carbon atoms or an aryloxy group, R2 and R3 each independently represent an aryloxy group or may be coupled together to form an arylenedioxy group. The process makes it possible to heighten the reaction rate and living properties upon polymerization and heighten the block formation efficiency upon block copolymerization.Type: GrantFiled: September 24, 2001Date of Patent: April 12, 2005Assignee: Kuraray Co., Ltd.Inventors: Naohiko Uchiumi, Kenichi Hamada, Masaji Kato, Tomohiro Ono, Sachie Yaginuma, Kazushige Ishiura
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Publication number: 20050038198Abstract: The present invention provides an adhesive composition containing a block copolymer, wherein the block copolymer has a polymer block (A) which is principally composed of a ?-methyl styrene unit, and a polymer block (B) which is principally composed of a conjugated diene unit and of which at least part of carbon-carbon unsaturated double bonds may be hydrogenated, and having a good holding power at high temperatures.Type: ApplicationFiled: September 21, 2004Publication date: February 17, 2005Applicant: KURARAY CO., LTDInventors: Yoshihiro Morishita, Hiromichi Nakata, Kenichi Hamada, Kazushige Ishiura
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Patent number: 6831144Abstract: In anionic polymerization using an anionic polymerization initiator, a tertiary organoaluminum compound (A) having in the molecule thereof a chemical structure represented by a general formula: Al—O—Ar wherein Ar represents an aromatic ring, and at least one Lewis base (B) selected from the group consisting of an ether compound and a tertiary polyamine compound are caused to be present in the polymerization system. In this way, the polar monomer can be polymerized with a high polymerization initiation efficiency and a high living polymerization property and at a high polymerization rate even if the used polymerization initiator is suitable for industrial use and a relatively mild cooling condition or a temperature condition near room temperature is adopted as a polymerization temperature condition.Type: GrantFiled: February 26, 2003Date of Patent: December 14, 2004Assignee: Kuraray Co., Ltd.Inventors: Kenichi Hamada, Kazushige Ishiura, Masaji Kato, Sachie Yaginuma
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Patent number: 6806317Abstract: The present invention provides an adhesive composition containing a block copolymer, wherein the block copolymer has a polymer block (A) which is principally composed of a &agr;-methyl styrene unit, and a polymer block (B) which is principally composed of a conjugated diene unit and of which at least part of carbon-carbon unsaturated double bonds may be hydrogenated, and having a good holding power at high temperatures.Type: GrantFiled: July 17, 2002Date of Patent: October 19, 2004Assignee: Kuraray Co., Ltd.Inventors: Yoshihiro Morishita, Hiromichi Nakata, Kenichi Hamada, Kazushige Ishiura
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Patent number: 6767976Abstract: (1) A methacrylic ester or an acrylic ester is anionically polymerized, using a polymerization initiator compound comprising an addition reaction product of a conjugated diene compound and an organic alkali metal compound, in the presence of a tertiary organoaluminum compound having in the molecule thereof a chemical structure represented by a formula: Al—O—Ar wherein Ar represents an aromatic ring; or (2) a methacrylic ester or an acrylic ester is anionically polymerized, using a polymerization initiator compound comprising an addition reaction product of an organic alkali metal compound and a compound having a 1,1-diaryl-1-alkene structure, by adding the ester in the form of a mixture with the above-mentioned specific tertiary organoaluminum compound to the polymerization system.Type: GrantFiled: June 3, 2003Date of Patent: July 27, 2004Assignee: Kuraray Co., Ltd.Inventors: Kenichi Hamada, Kazushige Ishiura, Toru Takahashi, Sachie Yaginuma, Makoto Akai, Tomohiro Ono, Kenji Shachi
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Patent number: 6737493Abstract: To provide a biocompatible material with a high level of safety at a low cost. The biocompatible material has a polymer synthesized from monomers by an anionic polymerization, wherein the polymer has a ratio (Mw/Mn) of a weight-average molecular weight (Mw) to a number-average molecular weight (Mn) in a range of 1.0 to 1.5, in which the weight-average molecular weight is 40,000 or more, and each of the monomers is represented by a following general formula (1): where R1 is a hydrogen atom or a methyl group; R2 is a C1-C4 alkylene group; and R3 is a C1-C4 alkyl group.Type: GrantFiled: April 25, 2002Date of Patent: May 18, 2004Assignees: Terumo Kabushiki Kaisha, Kuraray Co., Ltd.Inventors: Akira Mochizuki, Kenichi Shimura, Takao Anzai, Kazushige Ishiura, Kenichi Hamada
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Publication number: 20040034183Abstract: A block copolymer is obtained by anionic polymerization, includes two or more polymer blocks A miscible with each other, and at least one (meth)acrylic ester polymer block B immiscible with the polymer blocks A, has a ratio [Mn(Amax)/Mn(Amin)] of 2 or more, wherein the ratio [Mn(Amax)/Mn(Amin)] is the ratio of the largest number average molecular weight [Mn(Amax)] to the smallest number average molecular weight [Mn(Amin)] among the polymer blocks A, has at least one block bonding including polymer block Amax-polymer block B-polymer block Amin, and has a total content of the polymer blocks A ranging from 20 wt % to 45 wt % based on the total mass of the block copolymer.Type: ApplicationFiled: March 27, 2003Publication date: February 19, 2004Inventors: Masaji Kato, Kenichi Hamada, Kazushige Ishiura, Yoshihiro Morishita
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Publication number: 20030204033Abstract: (1) A methacrylic ester or an acrylic ester is anionically polymerized, using a polymerization initiator compound comprising an addition reaction product of a conjugated diene compound and an organic alkali metal compound, in the presence of a tertiary organoaluminum compound having in the molecule thereof a chemical structure represented by a formula: Al—O—Ar wherein Ar represents an aromatic ring; orType: ApplicationFiled: June 3, 2003Publication date: October 30, 2003Applicant: Kuraray Co., Ltd.Inventors: Kenichi Hamada, Kazushige Ishiura, Toru Takahashi, Sachie Yaginuma, Makoto Akai, Tomohiro Ono, Kenji Shachi
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Patent number: 6630554Abstract: (1) A methacrylic ester or an acrylic ester is anionically polymerized, using a polymerization initiator compound comprising an addition reaction product of a conjugated diene compound and an organic alkali metal compound, in the presence of a tertiary organoaluminum compound having in the molecule thereof a chemical structure represented by a formula: Al—O—Ar wherein Ar represents an aromatic ring; or (2) a methacrylic ester or an acrylic ester is anionically polymerized, using a polymerization initiator compound comprising an addition reaction product of an organic alkali metal compound and a compound having a 1,1-diaryl-1-alkene structure, by adding the ester in the form of a mixture with the above-mentioned specific tertiary organoaluminum compound to the polymerization system.Type: GrantFiled: September 18, 2000Date of Patent: October 7, 2003Assignee: Kuraray Co., Ltd.Inventors: Kenichi Hamada, Kazushige Ishiura, Toru Takahashi, Sachie Yaginuma, Makoto Akai, Tomohiro Ono, Kenji Shachi
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Publication number: 20030134998Abstract: In anionic polymerization using an anionic polymerization initiator, a tertiary organoaluminum compound (A) having in the molecule thereof a chemical structure represented by a general formula: Al—O—Ar wherein Ar represents an aromatic ring, and at least one Lewis base (B) selected from the group consisting of an ether compound and a tertiary polyamine compound are caused to be present in the polymerization system. In this way, the polar monomer can be polymerized with a high polymerization initiation efficiency and a high living polymerization property and at a high polymerization rate even if the used polymerization initiator is suitable for industrial use and a relatively mild cooling condition or a temperature condition near room temperature is adopted as a polymerization temperature condition.Type: ApplicationFiled: February 26, 2003Publication date: July 17, 2003Applicant: KURARAY CO. LTD.Inventors: Kenichi Hamada, Kazushige Ishiura, Masaji Kato, Sachie Yaginuma
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Patent number: 6555637Abstract: In anionic polymerization using an anionic polymerization initiator, a tertiary organoaluminum compound (A) having in the molecule thereof a chemical structure represented by a general formula: Al—O—Ar wherein Ar represents an aromatic ring, and at least one Lewis base (B) selected from the group consisting of a tertiary polyamine compound, are caused to be present in the polymerization system. In this way, the polar monomer can be polymerized with a high polymerization initiation efficiency and a high living polymerization property and at a high polymerization rate even if the used polymerization initiator is suitable for industrial use, and a relatively mild cooling condition or a temperature condition near room temperature is adopted as a polymerization temperature condition.Type: GrantFiled: August 15, 2000Date of Patent: April 29, 2003Assignee: Kuraray Co., Ltd.Inventors: Kenichi Hamada, Kazushige Ishiura, Masaji Kato, Sachie Yaginuma
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Publication number: 20020183472Abstract: To provide a biocompatible material with a high level of safety at a low cost. The biocompatible material has a polymer synthesized from monomers by an anionic polymerization, wherein the polymer has a ratio (Mw/Mn) of a weight-average molecular weight (Mw) to a number-average molecular weight (Mn) in a range of 1.0 to 1.Type: ApplicationFiled: April 25, 2002Publication date: December 5, 2002Inventors: Akira Mochizuki, Kenichi Shimura, Takao Anzai, Kazushige Ishiura, Kenichi Hamada