Patents by Inventor Akio Hata
Akio Hata 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: 5139892Abstract: A resin used for magnetic recording media, comprising a vinyl chloride copolymer containing vinyl monomers with hydroxyl groups and vinyl monomers with quaternary ammonium salt groups as component units. The resin is made by a method which comprises polymerizing an organic solvent solution containing vinyl chloride, vinyl monomers with hydroxyl groups and vinyl monomers with quaternary ammonium salt groups in a reacting apparatus to thereby precipitate a vinyl chloride copolymer, the interior surface of said reacting apparatus, which comes into contact with said organic solvent solution being coated with a fluororesin.Type: GrantFiled: February 13, 1991Date of Patent: August 18, 1992Assignee: Sekisui Kagaku Kogyo KabushikiInventors: Takeshi Nakachi, Akio Hata, Yoshihisa Watanabe
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Patent number: 5037893Abstract: A resin used for magnetic recording media, comprising a vinyl chloride copolymer containing vinyl monomers with hydroxyl groups and vinyl monomers with quaternary ammonium salt groups as component units. The resin is made by a method which comprises polymerizing an organic solvent solution containing vinyl chloride, vinyl monomers with hydroxyl groups and vinyl monomers with quaternary ammonium salt groups in a reacting apparatus to thereby precipitate a vinyl chloride copolymer, the interior surface of said reacting apparatus, which comes into contact with said organic solvent solution being coated with a fluororesin.Type: GrantFiled: June 26, 1989Date of Patent: August 6, 1991Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Takeshi Nakachi, Akio Hata, Yoshihisa Watanabe
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Patent number: 5028676Abstract: A resin used for magnetic recording media, comprising a vinyl chloride copolymer containing vinyl monomers with hydroxyl groups and vinyl monomers with quaternary ammonium salt groups as component units. The resin is made by a method which comprises polymerizing an organic solvent solution containing vinyl chloride, vinyl monomers with hydroxyl groups and vinyl monomers with quanternary ammonium salt groups in a reacting apparatus to thereby precipitate a vinyl chloride copolymer, the interior surface of said reactin apparatus, which comes into contact with said organic solvent solution being coated with a fluororesin.Type: GrantFiled: June 26, 1989Date of Patent: July 2, 1991Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Takeshi Nakachi, Akio Hata, Yoshihisa Watanabe
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Patent number: 5008357Abstract: A resin used for magnetic recording media, comprising a vinyl chloride copolymer containing vinyl monomers with hydroxyl groups and vinyl monomers with quaternary ammonium salt groups as component units. The resin is made by a method which comprises polymerizing an organic solvent solution containing vinyl chloride, vinyl monomers with hydroxyl groups and vinyl monomers with quaternary ammonium salt groups in a reacting apparatus to thereby precipitate a vinyl chloride copolymer, the interior surface of said reacting apparatus, which comes into contact with said organic solvent solution being coated with a fluororesin.Type: GrantFiled: June 26, 1989Date of Patent: April 16, 1991Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Takeshi Nakachi, Akio Hata, Yoshihisa Watanabe
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Patent number: 4996272Abstract: A resin used for magnetic recording media, comprising a vinyl chloride copolymer containing vinyl monomers with hydroxyl groups and vinyl monomers with quaternary ammonium salt groups as component units. The resin is made by a method which comprises polymerizing an organic solvent solution containing vinyl chloride, vinyl monomers with hydroxyl groups and vinyl monomers with quaternary ammonium salt groups in a reacting apparatus to thereby precipitate a vinyl chloride copolymer, the interior surface of said reacting apparatus, which comes into contact with said organic solvent solution being coated with a fluororesin.Type: GrantFiled: June 26, 1989Date of Patent: February 26, 1991Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Takeshi Nakachi, Akio Hata, Yoshihisa Watanabe
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Patent number: 4906499Abstract: An information signal record medium of an electrostatic capacitance type in which a signal information is recorded as geometric variations is described. The medium is made of a conductive resin composition which comprises a vinyl chloride resin and 5 to 30 parts by weight of conductive particles based on 100 parts by weight of the vinyl chloride resin. The vinyl chloride resin is obtained by polymerizing at least one monomer for the vinyl chloride resin in which from 0.2 to 1 parts by weight of a lubricant per 100 parts by weight of the vinyl chloride resin is dissolved.Type: GrantFiled: July 5, 1988Date of Patent: March 6, 1990Assignees: Victor Company of Japan, Ltd., Tokuyama Sekisui Industry Corporation, LimitedInventors: Toshiaki Hamaguchi, Kazuhira Namikawa, Toshio Akai, Mutsuaki Nakamura, Akio Kuroda, Akio Hata, Noriki Fujii
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Patent number: 4861683Abstract: A resin used for magnetic recording media, comprising a vinyl chloride copolymer containing vinyl monomers with hydroxyl groups and vinyl monomers with quaternary ammonium salt groups as component units. The resin is made by a method which comprises polymerizing an organic solvent solution containing vinyl chloride, vinyl monomers with hydroxyl groups and vinyl monomers with quaternary ammonium salt groups in a reacting apparatus to thereby precipitate a vinyl chloride copolymer, the interior surface of said reacting apparatus, which comes into contact with said organic solvent solution being coated with a fluororesin.Type: GrantFiled: August 22, 1988Date of Patent: August 29, 1989Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Takeshi Nakachi, Akio Hata, Yoshihisa Watanabe
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Patent number: 4631717Abstract: High density information records formed from conductive resin compositions which comprise a graft polymer obtained by subjecting vinyl chloride monomer to graft polymerization with a copolymer of ethylene and vinyl acetate having a content of vinyl acetate of not less than 35 wt % and a melt index up to 20 and prepared according to a solution polymerization technique. The conductive composition further comprises predetermined amounts of a conductive material and a lubricant of a specific type. The lubricant is an ester between aliphatic acid and alcohol having a hydroxyl value not larger than 15.Type: GrantFiled: November 26, 1984Date of Patent: December 23, 1986Assignees: Victor Company of Japan, Ltd., Tokuyama Sekisui Industry Corporation, LimitedInventors: Kazuhira Namikawa, Toshiaki Hamaguchi, Mutsuaki Nakamura, Akio Kuroda, Akio Hata, Noriki Fujii
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Patent number: 4592862Abstract: A conductive resin composition comprising a specific type of graft polymer of vinyl chloride and a vinyl chloride/acrylic ester copolymer, and a conductive powder used in an amount of from 10 to 30 wt % of the graft polymer. The conductive composition is particularly useful as video or digital audio discs.Type: GrantFiled: March 5, 1985Date of Patent: June 3, 1986Assignees: Victor Company of Japan, Ltd., Tokuyama Sekisui Industry, Corporation LimitedInventors: Mutsuaki Nakamura, Kazuhira Namikawa, Toshiaki Hamaguchi, Akio Kuroda, Akio Hata, Noriki Fujii
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Patent number: 4548739Abstract: A high density information record of the electrostatic capacitance type comprising a record substrate on which signal information is recorded as geometric variations. The record substrate is made of a conductive resin composition comprising a vinyl chloride resin and a conductive powder. The vinyl chloride resin is obtained by suspension polymerization of starting vinyl chloride monomer in an aqueous solution of a water-soluble polymer suspension stabilizer from which insoluble organic matters with sizes over 10 .mu.m have been removed.Type: GrantFiled: April 17, 1984Date of Patent: October 22, 1985Assignees: Victor Company of Japan, Ltd., Tokuyama Sekisui Industry Corporation, Ltd.Inventors: Mutsuaki Nakamura, Kazuhira Namikawa, Toshikazu Goshima, Toshiaki Hamaguchi, Akio Kuroda, Akio Hata, Noriki Fujii
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Patent number: 4517350Abstract: A method for removing polymer scales adhering to the inner surface of a polymerization vessel, which comprises polymerizing vinyl chloride monomer in an aqueous medium, discharging the resulting vinyl chloride polymer together with the aqueous medium from the polymerization vessel, thereafter placing in the vessel both a reaction product resulting from the reaction of an amine and acrylic acid or its derivative and an organic liquid which can dissolve or swell the polyvinyl polymer, and washing the inner surface of the vessel with the organic liquid solution of the reaction product.Type: GrantFiled: April 27, 1984Date of Patent: May 14, 1985Assignee: Tokuyama Sekisui Kogyo Kabushiki KaishaInventors: Akio Hata, Michifumi Tanga
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Patent number: 4465615Abstract: An electroconductive resin composition is a blend of 5-30% by weight carbon black and a graft-polymer. The graft-polymer is obtained by graft polymerizing 99-76 parts by weight of monomeric vinyl chloride to 1-15 parts by weight of an ethylenevinyl acetate copolymer, the ethylenevinyl acetate copolymer containing 10-65% by weight of vinyl acetate. The electroconductive resin composition has superior heat resistance and mechanical strength and improved flowability and heat stability. The electroconductive resin composition is particularly suitable for preparing video disc records.Type: GrantFiled: April 26, 1983Date of Patent: August 14, 1984Assignee: Tokuyama Sekisui Kogyo Kabushiki KaishaInventors: Akio Hata, Hiroshi Kake, Noriki Fujii
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Patent number: 4404337Abstract: The formation of scale on the inner surfaces of a vessel used for suspension polymerizing vinyl chloride is inhibited by applying a ternary reaction product of furfural, a polyamine and a phenol to said inner surfaces or by adding the ternary product to the polymerization system.Type: GrantFiled: June 17, 1981Date of Patent: September 13, 1983Assignee: Tokuyama Sekisui Kogyo Kabushiki KaishaInventors: Akio Hata, Michifumi Tanga
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Patent number: 4396660Abstract: An electroconductive resin composition is a blend of 5-30% by weight of carbon black and a graft-polymer. The graft-polymer is obtained by graft-polymerizing 99-76 parts by weight of monomeric vinyl chloride to 1-15 parts by weight of an ethylene-vinyl acetate copolymer, the ethylene-vinyl acetate copolymer containing 10-65% by weight of vinyl acetate. The electroconductive resin composition has superior heat resistance and mechanical strength and improved flowability and heat stability. The electroconductive resin composition is particularly suitable for preparing videodisc records.Type: GrantFiled: April 13, 1982Date of Patent: August 2, 1983Assignee: Tokuyama Sekisui Kogyo Kabushiki KaishaInventors: Akio Hata, Hiroshi Kake, Noriki Fujii