Patents by Inventor Kizuku Wakatsuki
Kizuku Wakatsuki 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: 7118013Abstract: An ?-cyanoacrylate adhesive system, having an excellent fast setting property in the adhesion of hardly adhering materials and porous materials; having an excellent storage stability, even when a plastic material is used for at least a part of container for the adhesive composition, nozzle, cap and tube; using an ?-cyanoacrylate adhesive composition comprising an ?-cyanoacrylate and 0.05 to 5.0% by weight, based on said ?-cyanoacrylate, of 12-crown-4-ether; and using a container for containing the adhesive composition, a nozzle and a cap, and optionally a tube for sending the adhesive composition to the nozzle, at least a part of said container, nozzle, cap and tube being made of a plastic material is provided.Type: GrantFiled: December 28, 2001Date of Patent: October 10, 2006Assignee: Taoka Chemical Company, LimitedInventors: Kizuku Wakatsuki, Yukinori Nishino, Eizo Kajigaki
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Publication number: 20040059030Abstract: An &agr;-cyanoacrylate adhesive system, having an excellent fast setting property in the adhesion of hardly adhering materials and porous materials; having an excellent storage stability, even when a plastic material is used for at least a part of container for the adhesive composition, nozzle, cap and tube; using an &agr;-cyanoacrylate adhesive composition comprising an &agr;-cyanoacrylate and 0.05 to 5.0% by weight, based on said &agr;-cyanoacrylate, of 12-crown-4-ether; and using a container for containing the adhesive composition, a nozzle and a cap, and optionally a tube for sending the adhesive composition to the nozzle, at least a part of said container, nozzle, cap and tube being made of a plastic material is provided.Type: ApplicationFiled: July 7, 2003Publication date: March 25, 2004Inventors: Kizuku Wakatsuki, Yukinori Nishino, Eizo Kajigaki
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Patent number: 6087424Abstract: A rubber composition obtained by kneading a mixture comprising 100 parts by weight of a solution polymerized diene rubber, 5-100 parts by weight of silica, 1-15 parts by weight of a silane coupling agent, and 1-20 parts by weight of an organic silicon compound having a number average molecular weight of about 100-10,000, and maintaining the temperature during the kneading at 200.degree. C. or less. The composition is excellent in wear resistance and productivity, has lower rolling resistance and is useful, for example, for automobile tires.Type: GrantFiled: March 11, 1996Date of Patent: July 11, 2000Assignee: Sumitomo Chemical Company LimitedInventors: Keisaku Yamamoto, Kizuku Wakatsuki, Hayato Saba
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Patent number: 5703151Abstract: Provided is a rubber composition obtainable by kneading a mixture at a maximum temperature between about 120.degree. to about 170.degree. C. The mixture includes:100 parts by weight of a solution polymerized diene rubber;about 5 to about 100 parts by weight of silica;about 1 to about 15 parts by weight of a silane coupling agent; andabout 1 to about 15 parts by weight of a polyalkylene glycol having a weight average molecular weight of about 200 to about 20,000.The invention also provides a method for making the rubber composition, a tire tread made from the rubber composition, and a tire made from the rubber composition.Type: GrantFiled: April 17, 1996Date of Patent: December 30, 1997Assignee: Sumitomo Chemical Company, LimitedInventors: Keisaku Yamamoto, Kizuku Wakatsuki, Hayato Saba
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Patent number: 5516862Abstract: A process for producing ethylene-.alpha.-olefin copolymer rubbers which comprises mixing a vanadium compound-containing solution and an alcohol-containing solution with stirring for 10-600 seconds to obtain a mixed solution, immediately feeding the mixed solution into a polymerization vessel containing an organoaluminum compound, and copolymerizing ethylene and an .alpha.-olefin, or ethylene, an .alpha.-olefin and a non-conjugated diene compound in the polymerization vessel. According to this process, the activity of polymerization catalyst can be maintained at a high level, no by-product of the reaction of the vanadium compound and the alcohol is deposited as precipitate in the apparatus and no such additional operations as bubbling is necessary.Type: GrantFiled: September 7, 1994Date of Patent: May 14, 1996Assignee: Sumitomo Chemical Company, LimitedInventors: Keisaku Yamamoto, Kizuku Wakatsuki, Hayato Saba, Tadaaki Nishiyama
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Patent number: 5430086Abstract: A rubber composition for tire treads comprising a rubber component consisting essentially of (A) 20 to 100% by weight of a solution-polymerized styrene-butadiene copolymer rubber having a Mooney viscosity ML.sub.1+4 of 30 to 200 at 100.degree. C. prepared by copolymerization of styrene, butadiene and a polyvinyl aromatic compound followed by coupling with a trifunctional or tetrafunctional coupling agent, and (B) 0 to 80% by weight of at least one rubber selected from the group consisting of an emulsion-polymerized styrene-butadiene rubber, a butadiene rubber, natural rubber and a synthetic polyisoprene rubber; and (C) 50 to 250 parts by weight of a carbon black having an iodine adsorption number of not less than 60 mg/g and an oil absorption of not less than 110 ml/100 g per 100 parts by weight of said rubber component; the tan .delta. peak temperature Tg of the cured product of said rubber composition being from -40.degree. to +5.degree. C.Type: GrantFiled: December 10, 1993Date of Patent: July 4, 1995Assignees: Sumitomo Rubber Industries, Sumitomo Chemical Co., Ltd.Inventors: Yuichi Saito, Toru Fukumoto, Shuji Imaoka, Keisaku Yamamoto, Kizuku Wakatsuki, Mitsuji Tsuji
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Patent number: 5290878Abstract: An elastomeric butadiene copolymer prepared by a process which comprises copolymerizing butadiene, a polyvinyl aromatic compound and optionally styrene in a hydrocarbon solvent in the presence of an organolithium polymerization initiator and subjecting the resulting copolymer having lithium at the polymer end or ends to a coupling reaction with a trifunctional or tetrafunctional coupling agent, said butadiene copolymer satisfying the following conditions: (a) the content of styrene is at most 50% by weight, (b) the content of vinyl bonds in the butadiene portion is from 10 to 90% by weight, (c) the molecular weight distribution curve obtained by a high performance liquid chromatography has at least three peaks, and 5 to 60% by weight of all the polymer chains have a molecular weight which is at least 5 times the molecular weight in terms of standard polystyrene corresponding to the peak appearing on the lowest molecular weight side of the high performance liquid chromatogram, and (d) the Mooney viscosity (ML.Type: GrantFiled: June 7, 1993Date of Patent: March 1, 1994Assignee: Sumitomo Chemical Company, LimitedInventors: Keisaku Yamamoto, Kizuku Wakatsuki, Mitsuji Tsuji, Yuichi Saito
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Patent number: 5245007Abstract: A method for purifying an ethylene-.alpha.-olefin olefin having at least 3 carbon atoms, or ethylene with an .alpha.-olefin having at least 3 carbon atoms and a nonconjugated diene compound, in a hydrocarbon solvent in the presence of a catalyst comprising a vanadium compound, an organoaluminum compound, and a halogenated ester compound, the method including a step of mixing and stirring the polymerization reaction mixture obtained by the polymerization reaction in an aqueous alkaline solution in such an amount as to give an aqueous phase having a pH of not lower than 10.0 after mixing and stirring, is disclosed. A method for purifying an ethylene-.alpha.-olefin copolymer is also disclosed, including a step of an oxidation treatment of the polymerization reaction mixture in an aqueous alkaline solution in such an amount as to give an aqueous phase having a pH of not lower than 10.0 after the oxidation treatment.Type: GrantFiled: December 12, 1991Date of Patent: September 14, 1993Assignee: Sumitomo Chemical Co., Ltd.Inventors: Keisaku Yamamoto, Kizuku Wakatsuki, Kiyoyuki Sugimori, Hayato Saba, Katsunari Inagaki
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Patent number: 5191041Abstract: An inert hydrocarbon solvent-soluble catalyst for polymerization of olefinic hydrocarbons and a process for producing an olefinic polymer using the same are disclosed, the catalyst being composed of (A) a reaction product obtained by reacting (a) at least one vanadium compound represented by formula:VO(OR).sub.m X.sub.3-mwherein R represents a hydrocarbon group; X represents a halogen atom; and m represents a real number of from 0 to 3, and (b) a dihydroxy hydrocarbon compound constituted of a straight chain hydrocarbon skeleton containing from 2 to 12 carbon atoms and having a hydroxyl group at each of both terminals thereof and at least one hydrocarbon branch bonded to said hydrocarbon skeleton in an inert hydrocarbon solvent at an (a) to (b) molar ratio of from 1:0.5 to 1:1.4 and (B) at least one organoaluminum compound represented by formula:R'.sub.n AlX'.sub.3-nwherein R' represents a hydrocarbon group; X' represents a halogen atom; and n represents a real number more than 0 and less than 3.Type: GrantFiled: January 16, 1992Date of Patent: March 2, 1993Assignee: Sumitomo Chemical Co., Ltd.Inventors: Hayato Saba, Keisaku Yamamoto, Akio Imai, Kiyoyuki Sugimori, Kizuku Wakatsuki
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Patent number: 5122493Abstract: An inert hydrocarbon solvent-soluble catalyst for polymerization of olefinic hydrocarbons and a process for producing an olefinic polymer using the same are disclosed, the catalyst being composed of (A) a reaction product obtained by reacting (a) at least one vanadium compound represented by formula:VO(OR).sub.m X.sub.3-mwherein R represents a hydrocarbon group; X represents a halogen atom; and m represents a real number of from 0 to 3, and (b) a dihydroxy hydrocarbon compound constituted of a straight chain hydrocarbon skeleton containing from 2 to 12 carbon atoms and having a hydroxyl group at each of both terminals thereof and at least one hydrocarbon branch bonded to said hydrocarbon skeleton in an inert hydrocarbon solvent at an (a) to (b) molar ratio of from 1:0.5 to 1:1.4 and (B) at least one organoaluminum compound represented by formula:R'.sub.n AlX'.sub.3-nwherein R' represents a hydrocarbon group X' represents a halogen atom; and n represents a real number more than 0 and less than 3.Type: GrantFiled: March 27, 1991Date of Patent: June 16, 1992Assignee: Sumitomo Chemical Co., Ltd.Inventors: Hayato Saba, Keisaku Yamamoto, Akio Imai, Kiyoyuki Sugimori, Kizuku Wakatsuki
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Patent number: 5039748Abstract: High-Strength polypropylene fiber is obtained from polypropylene having incorporated therein from 0.05 to 10,000 ppm by weight of a vinylcycloalkane polymer. The disclosed fiber polypropylene has an intrinsic viscosity of from 0.5 to 2.5 dl/g as measured in a tetralin solution at 135.degree. C. and a ratio of weight average molecular weight to number average molecular weight of not more than 3.5/1.Type: GrantFiled: May 17, 1990Date of Patent: August 13, 1991Assignee: Sumitomo Chemical Co., Ltd.Inventors: Kizuku Wakatsuki, Noboru Yamaguchi, Kazuki Wakamatsu, Masahiro Kakugo, Tadayuki Ohmae
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Patent number: 4946895Abstract: A resinous composition suitable for powder coating on metals on which a heat resistant coating layer is formed contains (A) modified polypropylene in which unsaturated carboxylic acid or anhydride is grafted on crystalline propylene/.alpha.-olefin copolymer, (B) ethylene polymer, (C) metal oxide or hydroxide and (D) polymers of C.sub.6 or more vinyl cycloalkane and the composition contains 0.001-1.0% by weight of the vinyl cycloalkane unit.Type: GrantFiled: September 29, 1989Date of Patent: August 7, 1990Assignee: Sumitomo Chemical Company, Ltd.Inventors: Tadayuki Ohmae, Kentaro Mashita, Kizuku Wakatsuki, Toshio Kawakita
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Patent number: 4883842Abstract: There is disclosed resin composition comprising 1 to 99% by weight of a polymer A and 1 to 99% by weight of a polymer B, the polymer A and B having refractive indexes which permit satisfaction of the relation:a.ltoreq.0.015 and b-a.gtoreq.0.005wherein a and b are the minimum and the maximum, respectively, of absolute value of the difference between the refractive indexes of the polymers A and B in the temperature range of 20.degree. to 100.degree. C.; said composition being useful as a functional resin for buildings, etc.Type: GrantFiled: March 28, 1988Date of Patent: November 28, 1989Assignee: Sumitomo Chemical Company, LimitedInventors: Shigeo Tanaka, Jiro Sakai, Tomohisa Fukao, Kizuku Wakatsuki, Kazuki Wakamatsu
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Patent number: 4801650Abstract: A process for producing a 4-methylpentene-1 copolymer comprising copolymerizing 4-methylpentene-1 with other .alpha.-olefin in a hydrocarbon solvent in the presence of a Ziegler-Natta catalyst and a resin composition containing the 4-methylpentene-1 copolymer are disclosed. The copolymerization comprises a first stage in which (A) a homopolymer or random copolymer of 4-methylpentene-1 having an .alpha.-olefin content of not more than 3 mol % and an intrinsic viscosity of at least 2.5 dl/g is prepared and a second stage in which (B) a random copolymer having an .alpha.-olefin content higher than that of the polymer (A) and no higher than 9 mol % and an intrinsic viscosity of at least 2.5 dl/g is prepared, and the produced copolymer insoluble in the solvent is separated to recover a 4-methylpentene-1 copolymer containing from 5 to 80% by weight of the polymer (A). The process produces a solvent-insoluble copolymer in an increased yield without impairing transparency of the copolymer.Type: GrantFiled: September 4, 1987Date of Patent: January 31, 1989Assignee: Sumimoto Chemical Co., Ltd.Inventors: Kizuku Wakatsuki, Kazuki Wakamatsu
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Patent number: 4748207Abstract: A crystalline polypropylene sheet is described, characterized by containing a polymer of a vinylcycloalkane having at least 6 carbon atoms in an amount of 0.05 wt ppm to 1 wt % (calculated as a vinylcycloalkane unit). This sheet is excellent in stiffness and transparency and is suitable for use in the production of various articles such as containers and trays.Type: GrantFiled: July 9, 1985Date of Patent: May 31, 1988Assignee: Sumitomo Chemical Company, LimitedInventors: Masahiro Kakugo, Yoshiharu Fukui, Kizuku Wakatsuki, Hideaki Nishio
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Patent number: 4696979Abstract: A process for producing a propylene copolymer having improved transparency and rigidity, which comprises carrying out (A) the polymerization of a vinyl cycloalkane having at least 6 carbon atoms and (B) the polymerization of propylene either alone or with ethylene in a multiplicity of steps in the presence of a catalyst system composed of a titanium compound and an organoaluminum compound. The content of the vinyl cycloalkane unit in the resulting copolymer is 0.05 to 10,000 weight ppm.Type: GrantFiled: December 27, 1984Date of Patent: September 29, 1987Assignee: Sumitomo Chemical Company, LimitedInventors: Akinobu Shiga, Masahiro Kakugo, Junpei Kozima, Kizuku Wakatsuki
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Patent number: 4663394Abstract: A crystalline polybutene-1 composition containing from 1.times.10.sup.-6 to 10% byweight of a vinylcycloalkane unit having a melting point of 180.degree. C. or higher in terms of its homopolymer, is disclosed. The composition has a markedly improved rate of crystal conversion of polybutene-1.Type: GrantFiled: June 20, 1985Date of Patent: May 5, 1987Assignee: Sumitomo Chemical Company, LimitedInventors: Masahiro Kakugo, Kizuku Wakatsuki
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Patent number: 4603174Abstract: A stretched polypropylene film having excellent see-through characteristics, which is prepared by stretching in at least one direction a polypropylene resin sheet containing 0.05 ppm to 10,000 ppm by weight of a 3-position branched .alpha.-olefin unit and/or a vinyl cycloalkane unit, each having at least 6 carbon atoms.Type: GrantFiled: December 27, 1984Date of Patent: July 29, 1986Assignee: Sumitomo Chemical Company, LimitedInventors: Tadayuki Okada, Masahiro Kakugo, Yoshiharu Fukui, Kizuku Wakatsuki, Seiichiro Ima, Junichi Kimura
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Patent number: 4584239Abstract: A stretched multilayer polypropylene film is described, comprising a stretched crystalline polypropylene layer and a layer of a composition (Composition B) laminated on at least one side of said polypropylene layer, wherein the composition B comprises a homo- or copolymer composed mainly of ethylene, propylene or butene-1 and having a melting point of 150.degree. C. or less, and a vinylcycloalkane polymer in an amount of 0.05 wt ppm to 10 wt % calculated as a vinylcycloalkane unit. This multilayer film is greatly improved in optical properties such as excellent see-through properties without deteriorating its good heat sealability. Thus it is very useful for wrapping.Type: GrantFiled: July 11, 1985Date of Patent: April 22, 1986Assignee: Sumitomo Chemical Company, LimitedInventors: Masahiro Kakugo, Yoshiharu Fukui, Kizuku Wakatsuki, Seiichiro Ima, Junichi Kimura
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Patent number: 4551501Abstract: A crystalline propylene polymer composition having excellent transparency and rigidity comprising a blend of a crystalline polypropylene with a polymer of a vinyl cycloalkane having at least 6 carbon atoms. The composition contains 0.05 weight ppm to 10,000 weight ppm of the vinyl cycloalkane unit.Type: GrantFiled: December 27, 1984Date of Patent: November 5, 1985Assignee: Sumitomo Chemical Company, LimitedInventors: Akinobu Shiga, Masahiro Kakugo, Junpei Kojima, Kizuku Wakatsuki