Patents by Inventor Yugen Kawamoto
Yugen Kawamoto 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: 7858153Abstract: A powder primer composition comprising as essential components (A) a carboxyl group-containing thermosetting polyester resin, (B1) a bisphenol A-type epoxy resin with an epoxy equivalent of 400-2000 g/eq or (B2) a bisphenol-type epoxy resin with an epoxy equivalent of 400-2000 g/eq and (C1) a bisphenol F-type epoxy resin with an epoxy equivalent of 400-2000 g/eq or (C2) a modified epoxy resin containing phenolic hydroxyl groups, obtained by reacting (a) a bifunctional epoxy resin with (b) an excess of a bifunctional phenol. Coating films obtained using the powder primer composition have excellent finished appearance and corrosion resistance.Type: GrantFiled: April 25, 2007Date of Patent: December 28, 2010Assignee: Kansai Paing Co., Ltd.Inventors: Yoshinori Kato, Akinari Niimi, Yugen Kawamoto
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Publication number: 20070255015Abstract: A powder primer composition comprising as essential components (A) a carboxyl group-containing thermosetting polyester resin, (B1) a bisphenol A-type epoxy resin with an epoxy equivalent of 400-2000 g/eq or (B2) a bisphenol-type epoxy resin with an epoxy equivalent of 400-2000 g/eq and (C1) a bisphenol F-type epoxy resin with an epoxy equivalent of 400-2000 g/eq or (C2) a modified epoxy resin containing phenolic hydroxyl groups, obtained by reacting (a) a bifunctional epoxy resin with (b) an excess of a bifunctional phenol. Coating films obtained using the powder primer composition have excellent finished appearance and corrosion resistance.Type: ApplicationFiled: April 25, 2007Publication date: November 1, 2007Inventors: Yoshinori Kato, Akinari Niimi, Yugen Kawamoto
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Publication number: 20070166466Abstract: The present invention provides an aqueous heat-resistant coating composition comprising: (A) an aqueous carboxy-containing acrylic-modified epoxy resin dispersion obtained by neutralizing a carboxy-containing acrylic-modified epoxy resin with a basic compound and dispersing the neutralized resin in an aqueous medium; (B) an inorganic coloring pigment; and (C) a rust-preventive pigment. The present invention further provides a process for applying the same.Type: ApplicationFiled: February 23, 2005Publication date: July 19, 2007Applicant: KANSAI PAINT CO., LTD.Inventors: Seiji Kashiwada, Hidekazu Kutsuma, Yugen Kawamoto
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Publication number: 20060014031Abstract: The present invention provides a powder paint excellent in productivity and cost, because the powder paints that are not adhered to the substrate can recovered and reused. And in case of using the powder paint of the present invention, coating efficiency is high and fine textured coated films excellent in attractiveness of appearance and water resistance can be obtained, because the base paint powder and the pigment particle thereof hardly separate. The powder paints of the present invention are characterized in that the pigment particles are bound to the base paint powders via shellac. The powder paints of the present invention not only allows uniform and firm binding of pigment particles to base paint powders by the action of shellac, but also provides the resulting coated films with excellent attractiveness of appearance.Type: ApplicationFiled: November 14, 2003Publication date: January 19, 2006Inventors: Toshio Ohkoshi, yugen Kawamoto, Masayoshi Harada, Manabu Imose
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Patent number: 6652917Abstract: The present invention provides a method for forming a topcoat according to a 2-coat 1-bake system comprising the steps of applying to a substrate a thermosetting aqueous colored base coating composition, applying to the uncured surface of the base coat a clear coating composition, and curing the two coats by heating, wherein the clear coating composition is a thermosetting powder coating composition comprising: (A) an epoxy-containing resin; and (B) a curing agent containing acid anhydride (a) represented by formula X—COO—[CO—(CH2)m—COO]n—CO—X (1) and at least one species selected from the group consisting of acid anhydride (b) represented by the formula HO—[CO—(CH2)p—COO]q—H (2) and dibasic acid (c).Type: GrantFiled: April 23, 2002Date of Patent: November 25, 2003Assignee: Kansai Paint Co., Ltd.Inventors: Takato Adachi, Ichiro Yoshihara, Yugen Kawamoto
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Publication number: 20030027939Abstract: The present invention provides a method for forming a topcoat according to a 2-coat 1-bake system comprising the steps of applying to a substrate a thermosetting aqueous colored base coating composition, applying to the uncured surface of the base coat a clear coating composition, and curing the two coats by heating, wherein the clear coating composition is a thermosetting powder coating composition comprising: (A) an epoxy-containing resin; and (B) a curing agent containing acid anhydride (a) represented by formulaType: ApplicationFiled: April 23, 2002Publication date: February 6, 2003Applicant: KANSAI PAINT CO., LTD.Inventors: Takato Adachi, Ichiro Yoshihara, Yugen Kawamoto
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Patent number: 6448345Abstract: The present invention provides a thermosetting powder coating composition comprising: (A) an epoxy-containing resin; and (B) a curing agent containing acid anhydride (a) and at least one species selected from the group consisting of acid anhydride (b) and dibasic acid (c), the acid anhydride (a) being represented by formula X—COO—[CO—(CH2)m—COO]n—CO—X (1) wherein the two X's are the same or different and independently represent a C4-12 alkyl group having a branched structure, R1—O—CO—R2—, R1—CO—R2— or R1—CO—NH—R2— in which R1 is a C1-10 monovalent saturated hydrocarbon group; R2 is a C1-10 bivalent saturated hydrocarbon group; m is an integer of 6 to 18; and n is an integer of 8 to 50, the acid anhydride (b) being represented by the formula HO—[CO—(CH2)p—COO]q—H (2) wherein p is an integer of 6 to 18 and q is an integer of 2 to 18,Type: GrantFiled: June 7, 2000Date of Patent: September 10, 2002Assignee: Kansai Paint Co., Ltd.Inventors: Takato Adachi, Ichiro Yoshihara, Yugen Kawamoto
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Patent number: 6403715Abstract: The present invention provides a thermosetting powder coating composition comprising: (A) an epoxy-containing resin; and (B) a curing agent containing, as an essential ingredient, an acid anhydride (a) represented by the formula HOOC—(CH2)m—[COO—CO—(CH2)m]n—COOR1 (1) wherein R1 represents a C1-10 monovalent saturated hydrocarbon group, m is an integer of 6 to 18, and n is a number of 1 to 20 on average, the molar ratio of carboxyl groups to acid anhydride groups in the curing agent being in the range from 0.15:1 to 2.0:1, the molar ratio of the total of carboxyl groups and acid anhydride groups in the curing agent (B) to epoxy groups in the epoxy-containing resin (A) being in the range from 0.7:1 to 1.2:1.Type: GrantFiled: February 27, 2001Date of Patent: June 11, 2002Assignee: Kansai Paint Co., Ltd.Inventors: Takato Adachi, Yugen Kawamoto, Hiromi Harakawa
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Patent number: 6348520Abstract: The present invention provide a method for color matching of a thermosetting powder coating composition, the method comprising the steps of: (1) dryblending two or more kinds of starting colored thermosetting powder coating compositions of different colors having an average particle size of 20 &mgr;m or less to achieve color matching, and (2) granulating the dryblend to a particle size in the range suitable for powder coating, by heating and agitating the dryblend, or by adding a specific solid binder, or by grinding and classifying a sheet or grains formed by compressing the dryblend. According to the present invention, color matching can be easily made, and a color-matched powder coating composition is obtained which is excellent in application characteristics, finished appearance and film properties.Type: GrantFiled: January 28, 2000Date of Patent: February 19, 2002Assignee: Kansai Paint Co., Ltd.Inventors: Kazuhiko Ohnishi, Yugen Kawamoto, Hidefumi Takanashi
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Patent number: 6331581Abstract: This invention provides a method for color matching of a thermosetting powder coating composition, the method comprising the steps of: dryblending two or more kinds of starting colored thermosetting powder coating compositions of different colors having an average particle size of 10 &mgr;m or less to achieve color matching, and granulating the dryblend to a particle size in the range which is suitable for coating, by adding at least one binder selected from the group consisting of an aqueous solution of polyethylene glycol and an aqueous dispersion of paraffin wax; and a production process therefor. According to the present invention, color matching can be easily made, and a film of the obtained color-matched powder coating composition is excellent in finished appearance and outstanding in properties.Type: GrantFiled: December 22, 1999Date of Patent: December 18, 2001Assignee: Kansai Paint Co., Ltd.Inventors: Kazuhiko Ohnishi, Hidefumi Takanashi, Yugen Kawamoto
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Publication number: 20010026837Abstract: The present invention provides a thermosetting powder coating composition comprising:Type: ApplicationFiled: February 27, 2001Publication date: October 4, 2001Applicant: KANSAI PAINT CO., LTD.Inventors: Takato Adachi, Yugen Kawamoto, Hiromi Harakawa
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Patent number: 6268429Abstract: The present invention provides an aqueous coating comprising: (A) a resin having hydroxyl group and carboxyl group in the molecule, (B) an alkyl-etherified methylolmelamine resin, and (C) an oxazoline group-containing compound. This aqueous coating can alleviate the problems of conventional aqueous coatings comprising (a) a resin having hydroxyl group and carboxyl group and (b) an alkyl-etherified methylolmelamine resin.Type: GrantFiled: January 13, 2000Date of Patent: July 31, 2001Assignee: Kansai Paint Co., Ltd.Inventors: Masaru Mitsuji, Nobushige Numa, Yugen Kawamoto
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Patent number: 6162861Abstract: The present invention provides a granulated powder coating composition prepared by granulating a starting powder coating composition having an average particle size of 10 .mu.m or less to an average particle size suitable for powder coating; and a process for preparing a granulated powder coating composition, comprising granulating a starting powder coating composition having an average particle size of 10 .mu.m or less to an average particle size suitable for powder coating.Type: GrantFiled: November 12, 1999Date of Patent: December 19, 2000Assignee: Kansai Paint Company, LimitedInventors: Yugen Kawamoto, Yoshinori Kato, Shinichi Ueda, Mituo Wakimoto, Toshio Ohkoshi
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Patent number: 6060554Abstract: The present invention provides an aqueous coating comprising:(A) a resin having hydroxyl group and carboxyl group in the molecule,(B) an alkyl-etherified methylolmelamine resin, and(C) an oxazoline group-containing compound.This aqueous coating can alleviate the problems of conventional aqueous coatings comprising (a) a resin having hydroxyl group and carboxyl group and (b) an alkyl-etherified methylolmelamine resin.Type: GrantFiled: January 22, 1998Date of Patent: May 9, 2000Assignee: Kansai Paint Co., Ltd.Inventors: Masaru Mitsuji, Nobushige Numa, Yugen Kawamoto
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Patent number: 5945487Abstract: The invention provides a thermosetting powder coating composition comprising (A) a vinyl copolymer having a number average molecular weight of 1,500 to 6,000, a molecular weight distribution of 1.0 to 1.5 as represented by a weight average molecular weight/a number average molecular weight and a glass transition temperature of 40 to 100.degree. C., the copolymer containing at least one species of functional group selected from the class consisting of epoxy group, carboxyl group and hydroxyl group, and (B) a curing agent. The thermosetting powder coating composition of the invention is superior in any of the finished appearance of coating film and the blocking resistance.Type: GrantFiled: January 23, 1997Date of Patent: August 31, 1999Assignee: Kansai Paint Company, Ltd.Inventors: Toshio Ohkoshi, Yugen Kawamoto, Toshio Ogasawara, Motoshi Yabuta, Koji Yamada