Patents by Inventor Toshimasa Sagawa
Toshimasa Sagawa 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: 7732545Abstract: An aqueous dispersion is prepared by subjecting (meth)acrylate containing a polyfluoroalkyl group and a polymerizable monomer containing no fluorine atom to an emulsification treatment in the presence of a surfactant and a polypropyleneglycol-based compound having a molecular weight of 250 to 5,000, followed by copolymerization reaction in the presence of a polymerization initiator. The resulting aqueous dispersion, even if prepared from (meth)acrylate copolymer containing mixed perfluoroalkyl groups including perfluoroalkyl groups having 12 or more carbon atoms as polyfluoroalkyl groups, has a distinguished emulsion stability and thus can be effectively used as a water and oil repellent, etc.Type: GrantFiled: January 21, 2004Date of Patent: June 8, 2010Assignee: Unimatec Co., Ltd.Inventors: Toshimasa Sagawa, Haruyoshi Tatsu, Masayosi Horiuti
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Publication number: 20090286931Abstract: An aqueous dispersion is prepared by subjecting (meth)acrylate containing a polyfluoroalkyl group and a polymerizable monomer containing no fluorine atom to an emulsification treatment in the presence of a surfactant and a polypropyleneglycol-based compound having a molecular weight of 250 to 5,000, followed by copolymerization reaction in the presence of a polymerization initiator. The resulting aqueous dispersion, even if prepared from (meth)acrylate copolymer containing mixed perfluoroalkyl groups including perfluoroalkyl groups having 12 or more carbon atoms as polyfluoroalkyl groups, has a distinguished emulsion stability and thus can be effectively used as a water and oil repellent, etc.Type: ApplicationFiled: July 24, 2009Publication date: November 19, 2009Applicant: UNIMATEC CO.,LTD.Inventors: Toshimasa Sagawa, Haruyoshi Tatsu, Masayosi Horiuti
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Patent number: 7615592Abstract: A water- and oil-repellent agent is produced by subjecting (a) a polyfluoroalkyl group-containing (meth)acrylate and (b) a fluorine atom-free polymerizable monomer to an emulsification treatment in the presence of (c) a polyethylene oxide adduct type, cationic surfactant, or both of the cationic surfactant and a polyethylene oxide adduct type, non-ionic surfactant, and (d) a glycol-based compound, followed by copolymerization reaction in the presence of a polymerization initiator, and admixing the resulting aqueous dispersion with (e) a blocked isocyanate, and gives a satisfactory water and oil repellency to not only synthetic fibers, but also natural fibers, and also has a distinguished washing durability.Type: GrantFiled: May 27, 2005Date of Patent: November 10, 2009Assignee: Unimatec Co., LtdInventors: Toshimasa Sagawa, Haruyoshi Tatsu
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Publication number: 20080071025Abstract: A water- and oil-repellent agent is produced by subjecting (a) a polyfluoroalkyl group-containing (meth)acrylate and (b) a fluorine atom-free polymerizable monomer to an emulsification treatment in the presence of (c) a polyethylene oxide adduct type, cationic surfactant, or both of the cationic surfactant and a polyethylene oxide adduct type, non-ionic surfactant, and (d) a glycol-based compound, followed by copolymerization reaction in the presence of a polymerization initiator, and admixing the resulting aqueous dispersion with (e) a blocked isocyanate, and gives a satisfactory water and oil repellency to not only synthetic fibers, but also natural fibers, and also has a distinguished washing durability.Type: ApplicationFiled: May 27, 2005Publication date: March 20, 2008Inventors: Toshimasa Sagawa, Haruyoshi Tatsu
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Publication number: 20070106043Abstract: In the production of an acrylic copolymer by emulsion polymerization of a monomer mixture comprising (a) 30-70% by weight of perfluoroalkylalkyl (meth)acrylate, represented by the following general formula: CH2?CRCOOR? Rf (where R is a hydrogen atom or a methyl group, R? is a linear or branched alkylene group having 1-8 carbon atoms, and Rf is a perfluoroalkyl group having 4-16 carbon atoms), (b) 25-60% by weight of stearyl (meth)acrylate, (c) 0.1-5% by weight of (meth)acrylamide, and (d) 0.1-5% by weight of N-methylol (meth)acrylamide, in the presence of a non-ionic and/or cationic surfactant, a polypropylene glycol-based compound having a molecular weight of 250-5,000 is used as an emulsification aid at the same time. The resulting aqueous dispersion of acrylic copolymer has distinguished preservation stability, and water and oil repellency.Type: ApplicationFiled: March 22, 2005Publication date: May 10, 2007Inventors: Masayoshi Horiuchi, Toshimasa Sagawa, Hanuyoshi Tatsu
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Publication number: 20060052516Abstract: An aqueous dispersion is prepared by subjecting (meth)acrylate containing a polyfluoroalkyl group and a polymerizable monomer containing no fluorine atom to an emulsification treatment in the presence of a surfactant and a polypropyleneglycol-based compound having a molecular weight of 250 to 5,000, followed by copolymerization reaction in the presence of a polymerization initiator. The resulting aqueous dispersion, even if prepared from (meth)acrylate copolymer containing mixed perfluoroalkyl groups including perfluoroalkyl groups having 12 or more carbon atoms as polyfluoroalkyl groups, has a distinguished emulsion stability and thus can be effectively used as a water and oil repellent, etc.Type: ApplicationFiled: January 24, 2004Publication date: March 9, 2006Applicant: UNIMATEC CO., LTDInventors: Toshimasa Sagawa, Haruyoshi Tatsu, Masayosi Horiuti
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Patent number: 5808132Abstract: Heptafluoroisobutenyl methyl ether having the following formula: ##STR1## is oxidized with ozone to produce perfluoro(2-methyl-1,2-epoxy-propyl) methyl ether. The resulting intermediate compound is allowed to react with an aromatic compound ArH to produce .alpha.,.alpha.-bis(trifluoromethyl)arylacetic acid methyl ester having the following formula: ##STR2## By hydrolysis, decarboxylation and further hydrolysis of the ester compound, .alpha.,.alpha.-bis(trifluoromethyl)arylacetic acid for use as raw materials for medicines, agricultural chemicals, liquid crystals, etc. or reagents for determining an optical purity can be obtained.Type: GrantFiled: March 12, 1996Date of Patent: September 15, 1998Assignee: Nippon Mektron, LimitedInventors: Takehiro Sonoi, Toshimasa Sagawa, Futoshi Masaki, Toshio Kubota
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Patent number: 4960947Abstract: Hexafluoroacetone or its hydrate is produced in a higher yield than that of the conventional process (1) by oxidizing a heptafluoroisobutenyl ether with ozone or (2) by thermally decomposing an octafluoroisobutyl ether or a heptafluoroisobutenyl ether in the presence of oxygen and an activated carbon catalyst.Type: GrantFiled: June 28, 1989Date of Patent: October 2, 1990Assignee: Nippon Mektron LimitedInventors: Takehiro Sonoi, Toshimasa Sagawa, Okimasa Yamada, Tetsuya Mizuno
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Patent number: 4885398Abstract: Hexafluoracetone or its hydrate is produced in a higher yield than that of the conventional process (1) by oxidizing a heptafluoroisobutenyl ether with ozone or (2) by thermally decomposing an octafluoroisobutyl ether or a heptafluoroisobutenyl ether in the presence of oxygen and an activated carbon catalyst.Type: GrantFiled: May 2, 1988Date of Patent: December 5, 1989Assignee: Nippon Mektron LimitedInventors: Takehiro Sonoi, Toshimasa Sagawa, Okimasa Yamada, Tetsuya Mizuno
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Patent number: 4833212Abstract: A fluorine-containing elastomer composition which comprises (a) a fluorine-containing elastomer, (b) at least one of divalent metal oxide and hydroxide, (c) a polyhydroxyaromatic compound and (d) a complex compound of 1,8-diazobicyclo[5,4,0]undec-7-ene or diazabicyclo[4,3,0]non-5-ene and a divalent metal chloride, has a good stock storage stability and can produce a vulcanized product with improved vulcanized product properties and compression set.Type: GrantFiled: February 4, 1988Date of Patent: May 23, 1989Assignee: Nippon Mektron LimitedInventors: Okimasa Yamada, Tetsuya Mizuno, Takehiro Sonoi, Toshimasa Sagawa
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Patent number: 4734169Abstract: Hexafluoroacetone hydrate is obtained with a high current efficiency by electrolytically oxidizing dimer or monomer of hexafluoro-.alpha.-hydroxyisobutanoic acid in an electrolytic solution composed of an aqueous solution of (1) a nickel salt and (2) HCl, HBr or an alkali metal or alkaline earth metal thereof.Type: GrantFiled: July 28, 1987Date of Patent: March 29, 1988Assignee: Nippon Mektron, LimitedInventors: Kazuma Yokoi, Takao Iida, Toshimasa Sagawa