Patents by Inventor Katsuaki Kida
Katsuaki Kida 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: 5185229Abstract: Dry toner for electrophotography in the form of colored particles, each particle being composed of a colored core portion having an average diameter of 5 to 20.mu. and comprising as main ingredients, a coloring material and heat-meltable resin having a flow initiation temperature of 120.degree. C. to 160.degree. C., and a covering shell portion of a vinyl resin mixture of a comparatively low molecular weight component and a high molecular weight component, each having the maximum value in the molecular weight distribution curve obtained by gel-permeation chromatography of 8.times.10.sup.3 to 3.times.10.sup.4 and 8.times.10.sup.4 to 5.times.10.sup.5, respectively, and present in a ratio of Mw/Mn=5.0 or more; the weight ratio of said vinyl resins to the total weight of said core and shell portions being 8 to 25% by weight. The present dry toner is particularly useful for use in a high speed electrography.Type: GrantFiled: January 22, 1991Date of Patent: February 9, 1993Assignee: Nippon Paint Co., LimitedInventors: Haruhiko Sato, Katsuaki Kida, Akio Kashihara
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Patent number: 5034432Abstract: The invention concerns powder coatings comprising thermoplastic or thermosetting type resin powder particles, each particle carrying at least on the surface thereof, a number of microparticles having an average diameter of 0.001 to 10.mu. of such resin as having a glass transition temperature of 50.degree. to 150.degree. C. and a SP value of 9 to 15, said microparticle optionally containing UV absorber or antioxidant or hardening catalyst, the weight ratio of said microparticles to the total weight of the powder coatings being 0.05 to 30% by weight. The present powder coatings are excellent in blocking resistance and capable of forming a coating with excellent stain resistance, coating appearance and other desired properties.Type: GrantFiled: December 29, 1989Date of Patent: July 23, 1991Assignee: Nippon Paint Co., Ltd.Inventors: Tasaburo Ueno, Akimitsu Uenaka, Yuji Toyoda, Katsuaki Kida, Masayuki Maruta, Koichi Tsutsui
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Patent number: 4977053Abstract: Disclosured is a toner comprising colored particles and a magnetic shell coated thereon, wherein said colored particles are composed of a binder resin and a coloring agent, and said magnetic shell is formed from an iron-oxide type magnetic material. The toner can be fixable at a low temperature or a low pressure, but the toner particles do not agglomerate with each other during long-term storage.Type: GrantFiled: September 29, 1989Date of Patent: December 11, 1990Assignee: Nippon Paint Co., Ltd.Inventors: Masao Ohishi, Katsuaki Kida, Katsukiyo Ishikawa, Takao Saito, Kouichi Nagata
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Patent number: 4968576Abstract: Resinous microparticles useful in toner for electrophotography which are made of vinyl resin obtained by emulsion polymerization of at least one .alpha.,.beta.-ethylenically unsaturated monomers in the presence of cationic surfactant having an onium salt structure and a polymerization initiator having an amidine or amidine salt structure and whose average particle diameter is in a range of from 0.01 to 1.mu., and toner composition comprising toner particles and resinous microparticles as abovementioned are provided.Type: GrantFiled: January 17, 1989Date of Patent: November 6, 1990Assignee: Nippon Paint Co., Ltd.Inventors: Masayuki Maruta, Katsuaki Kida, Eio Hisajima, Akio Kashihara, Naoya Yabuuchi
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Patent number: 4803252Abstract: Particles of crosslinked polymer obtained by the copolymerization of a defined amount of particular di (meth) acrylol bearing compound and other copolymerizable unsaturated monomer through an emulsion polymerization technique without using an emulsifier and a coating composition containing thus obtained particles of crosslinked polymer with excellent film properties.Type: GrantFiled: July 29, 1986Date of Patent: February 7, 1989Assignee: Nippon Paint Co., Ltd.Inventors: Katsuaki Kida, Akio Kashihara, Keizou Ishii, Hiromichi Kayano
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Patent number: 4530946Abstract: A resinous emulsion is prepared by copolymerizing .alpha.,.beta.-ethylenically unsaturated monomers and a crosslinking monomer which is at least difunctional, in an aqueous medium in the presence of a resin having an amphoionic group of the formula: ##STR1## wherein R represents substituted or unsubstituted C.sub.1 -C.sub.6 alkylene or phenylene and Y is --COOH or --SO.sub.3 H, or in the presence of a resin having the above said amphoionic group and a polymerizable .alpha.,.beta.-unsaturated bonding. The thus obtained emulsion is useful for the obtainment of crosslinked polymer microparticles to be incorporated in a high solid coating composition or for the preparation of aqueous coating composition because of having contained no harmful emulsifier or surfactant.Type: GrantFiled: March 2, 1984Date of Patent: July 23, 1985Assignee: Nippon Paint Co., Ltd.Inventors: Kazunori Kanda, Keizou Ishii, Katsuaki Kida, Shinichi Ishikura, Ryuzo Mizuguchi
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Patent number: 4518724Abstract: An aqueous coating composition which comprises (A) at least one aqueous resin selected from acryl, alkyd, polyester, acryl-modified alkyd and acryl-modified polyester resins, (B) at least one component selected from water-insoluble resinous particles having an average grain diameter of 0.3 to 6.mu., obtained by a polymerization of ethylenically unsaturated compound(s), and (C) optional additives, the weight ratio of said (A) to (B) (in solid) being 99:1.about.15:85. This aqueous paint is especially useful as a top-coat.Type: GrantFiled: October 3, 1983Date of Patent: May 21, 1985Assignee: Nippon Paint Co., Ltd.Inventors: Teruaki Kuwajima, Katsuaki Kida, Shinichi Ishikura
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Patent number: 4504609Abstract: An aqueous coating composition which comprises (A) at least one aqueous resin selected from acryl, alkyd, polyester, acryl--modified alkyd and acryl-modified polyester resins, (B) at least one component selected from water-insoluble resinous particles having an average grain diameter of 0.01 to 0.1.mu., obtained by a polymerization of ethylenically unsaturated compound(s), and (C) optional additives, the weight ratio of said (A) to (B) (in solid) being 99:1.about.15:85. This aqueous paint is especially useful as a top-coat.Type: GrantFiled: October 3, 1983Date of Patent: March 12, 1985Assignee: Nippon Paint Co., Ltd.Inventors: Teruaki Kuwajima, Hiroshi Miwa, Katsuaki Kida, Shinichi Ishikura
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Patent number: 4468493Abstract: A high solid coating composition comprising(A) a film-forming polymer having functional group(s) capable of reacting with the crosslinking agent (D) hereinafter referred to,(B) a volatile organic liquid diluent in which the polymer (A) is carried,(C) polymer microparticles having an average diameter of from 0.02 to 40 microns, which are insoluble in the combination of the film-forming polymer (A) and the diluent (B) and are maintained in a stabilized state of dispersion therein, and(D) a crosslinking agent dissolved in the diluent (B), which is characterized by the fact that the microparticles (C) are composed of crosslinked copolymer obtained by copolymerizing at least one of the polymerizable amino acid compounds of the formula: ##STR1## with other polymerizable .alpha.,.beta.-ethylenically unsaturated monomers, at least part of which is crosslinking monomer.Type: GrantFiled: January 25, 1983Date of Patent: August 28, 1984Assignee: Nippon Paint Co., Ltd.Inventors: Shinichi Ishikura, Kazunori Kanda, Katsuaki Kida, Ryuzo Mizuguchi
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Patent number: 4461870Abstract: A high solid coating composition comprising(A) a film-forming polymer having functional group(s) capable of reacting with the crosslinking agent (D) hereinafter referred to,(B) a volatile organic liquid diluent in which the polymer (A) is carried,(C) polymer microparticles having an average diameter of from 0.02 to 40 microns, which are insoluble in the combination of the film-forming polymer (A) and the diluent (B) and are maintained in a stabilized state of dispersion therein, and(D) a crosslinking agent dissolved in the diluent (B),which is characterized in that the microparticles (C) are composed of crosslinked copolymer of .alpha.,.beta.-ethylenically unsaturated monomers carrying thereon a resinous portion having an amphoionic group of the formula: ##STR1## wherein R is a member selected from optionally substituted alkylene having 1 to 6 carbon atoms and phenylene group and Y is --COOH or --SO.sub.3 H.Type: GrantFiled: January 25, 1983Date of Patent: July 24, 1984Assignee: Nippon Paint Co., Ltd.Inventors: Kazunori Kanda, Keizou Ishii, Katsuaki Kida, Shinichi Ishikura, Ryuzo Mizuguchi