Patents by Inventor Mika Ohsawa
Mika Ohsawa 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: 6207235Abstract: A one-pack coating composition is disclosed. The composition comprises (A) an oligomer or polymer containing an acid anhydride group, a blocked hydroxyl group and an epoxy group as indispensable functional groups in the same or different molecules, (B) a heat-potential curing catalyst which comprises a complex of an organometallic compound and an electron-donating compound or an onium salt and which exhibits its activity upon heating, (C) an ultraviolet absorber comprising a triazine or oxalic anilide, and (D) a hindered amine light stabilizer having a piperidine ring of the following structure: wherein R represents R1—CO—, a C2 to C20 alkyl group or R1—O— (R1 being a C2 to C20 alkyl group), and R2, R3, R4 and R5 independently from each other represent a C1 to C3 alkyl group, or a phenolic antioxidant. A method for coating using this coating composition is also disclosed.Type: GrantFiled: March 14, 1996Date of Patent: March 27, 2001Assignee: Mazda Motor CorporationInventors: Mika Ohsawa, Yoshiaki Marutani, Hiroyuki Uemura, Kazuhi Koga, Hiroshi Kubota
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Patent number: 6111044Abstract: A thermosetting composition which gives a cured product having excellent weatherability, chemical and physical properties, in particular acid resistance and abrasion resistance, at a relatively low temperature, which has superior storage stability, and which can be used as a one component coating material; a coating composition utilizing this thermosetting composition; a method of coating; and a coated article are provided. The thermosetting composition contains a resin having at least one functional group selected from the group consisting of a blocked hydroxyl group, blocked carboxylic acid, and an epoxy group. The thermosetting composition has a blocked hydroxyl group, blocked carboxylic acid, and an epoxy group.Type: GrantFiled: November 4, 1998Date of Patent: August 29, 2000Assignees: NOF Corporation, Mazda Motor CorporationInventors: Toshio Yamamoto, Kazuhi Koga, Yoshiaki Marutani, Hiroshi Kubota, Tadamitsu Nakahama, Mika Ohsawa
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Patent number: 6040009Abstract: The present invention is to provide a low solvent content type-coating composition by which the resultant coatings with good scuff resistance or water resistance as well as good chipping resistance are produced, while the content of an organic solvent to be used can be much reduced. The low solvent content type-coating composition comprises a polyester oligomer having a hydroxyl group in an amount of 2.0 to 10.0 moles/Kg-resin, a number average molecular weight (Mn) of 300 to 1500, a weight average molecular weight (Mw) of 300 to 3000, and a ratio of a weight average molecular weight/a number average molecular weight (Mw/Mn) of 1 to 2.0, an amount of a modifying lactone being 31 to 85%, and an aliphatic hydrocarbon group of C4-22 which is not derived from lactones. The present invention is also to provide a process for coating a low solvent content type-coating composition on, for example, a base coating composition by a wet-on-wet coating.Type: GrantFiled: June 19, 1995Date of Patent: March 21, 2000Assignee: Mazda Motor CorporationInventors: Yoshiaki Marutani, Takashi Tomita, Tadamitsu Nakahama, Hiroyuki Uemura, Kazuhi Koga, Mika Ohsawa
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Patent number: 5998035Abstract: A coating method is disclosed, which comprises coating a base coating paint on a substrate, coating thereon a clear coating paint of a curing system different from that of the base coating paint in a wet-on-wet state, and then baking the resultant coatings, wherein a curing catalyst for curing the clear coating paint is incorporated into the base coating paint and wherein the curing catalyst has a boiling point of 150.degree. C. or higher under 760 mmHg. The base coating paint comprising such a curing catalyst is also disclosed.Type: GrantFiled: December 11, 1997Date of Patent: December 7, 1999Assignees: Mazda Motor Corporation, Dainippon Ink and Chemicals, IncorporatedInventors: Goro Iwamura, Shigeki Matsui, Norio Kosaka, Yoshiaki Marutani, Kazuhi Koga, Mika Ohsawa, Hiroshi Kubota
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Patent number: 5962588Abstract: The present invention provides a curable resin composition incorporating an oligomer containing blocked hydroxyl group, an epoxy-group containing compound, hydrolytic silyl-group containing compound, and a dissociation catalyst and/or curing catalyst, each possessing a specific molecular weight; a paint which uses this resin composition as a binder; and a coat-finishing method which coat-finishes any desired material using the aforementioned resin composition and paint. According to the present invention, it is possible to reduce viscosity, and consequently increase the coat non-volatile content and hence improve acid resistance, abrasion resistance, and the like. In addition, according to the present invention, it is possible to obtain a curable resin composition, paint using this curable resin composition, and coat-finishing method for this paint in which the aforementioned resin and paint have an extremely high utility and possess a high solid content wherein air bubbles and drip-runs are not generated.Type: GrantFiled: November 12, 1997Date of Patent: October 5, 1999Assignees: Dainippon Ink and Chemicals, Inc., Mazda Motor CorporationInventors: Goro Iwamura, Shigeki Matsui, Ichiro Azuma, Yoshiaki Marutani, Hiroyuki Uemura, Tadamitsu Nakahama, Shinji Sasaki, Kazuhi Koga, Takashi Tomita, Mika Ohsawa
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Patent number: 5955545Abstract: A coating for polyolefin molding compositions comprises (1) (a) from 40-90% by weight of a chlorinated polyolefin grafted with a vinyl-polymerizable monomer having a hydroxyl group at a position 15 to 40 atoms distant from the main chain of vinyl polymer grafted onto the chlorinated polyolefin, or (b) from 50 to 90% by weight of a vinyl polymer obtained by polymerizing from 5 to 40% by weight of a hydroxyl group-containing (meth)acrylate monomer having a carbon chain derived from an alcohol residue with from 6 to 18 carbon atoms, and a vinyl-polymerizable monomer having a hydroxyl group at a position 15 to 40 atoms distant from the vinyl group, wherein the vinyl polymerizable monomer is derived from the reaction product of a vinyl-polymerizable monomer having a hydroxyl group at a position 2 to 12 atoms distant from the vinyl group and a lactone, and (2) from 10 to 60 or 50% by weight of a melamine resin containing methylol, alkoxy or imino groups.Type: GrantFiled: July 24, 1996Date of Patent: September 21, 1999Assignee: Madza Motor CorporationInventors: Yoshiaki Marutani, Mika Ohsawa, Yasuyuki Takeuchi, Hiroki Kagawa
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Patent number: 5786435Abstract: The present invention relates to a low solvent content-type resin composition, a low solvent content-type coating composition containing such a resin composition as a binder, and a method for coating such a coating composition. The resin composition comprises an oligomer containing an alicyclic epoxy group in a molecule and having a number average molecular weight (Mn) of 300 to 2000, a weight average molecular weight (Mw) of 300 to 4000 and an Mw/Mn ratio of 1 to 2.5. The coating composition comprises such a resin composition and a cationic polymerization catalyst, wherein the content of an organic solvent content is 0 to 40 wt. %. Since the present composition contains a low molecular weight oligomer, the viscosity of the composition is low even though the solid content is high. Accordingly, the content of the organic solvent can be much reduced.Type: GrantFiled: September 10, 1997Date of Patent: July 28, 1998Assignee: Mazda Motor CorporationInventors: Yoshiaki Marutani, Tadamitsu Nakahama, Shinji Sasaki, Hiroyuki Uemura, Kazuhi Koga, Takashi Tomita, Mika Ohsawa
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Patent number: 5773511Abstract: The present invention relates to a coating composition which is excellent in handling and safety, enables the curing of the resultant coating composition at low temperature, and provides an excellent adhesion to polyolefin resin moldings. The coating composition comprises (1) 40-90 wt. % of a grafted and chlorinated polyolefin oligomer obtained by graft polymerizing a vinyl polymerizable monomer to a chlorinated polyolefin, the grafted and chlorinated polyolefin oligomer having a primary or blocked primary hydroxyl group at a position of 15 to 40 atoms away from the vinyl graft polymer chain grafted to the chlorinated polyolefin, a number average molecular weight of 5,000 to 50,000, 0.4 to 2.5 mole/kg-resin of a primary or blocked primary hydroxyl group, 50 to 95 wt. % of said vinyl graft polymer chain, and 5 to 50 wt. % of the chlorinated polyolefin used as a starting material, and (2) 60 to 10 wt. % of an imino-type, methylol-type or complete alkoxy-type melamine resin.Type: GrantFiled: November 20, 1995Date of Patent: June 30, 1998Assignee: Mazda Motor CorporationInventors: Yoshiaki Marutani, Mika Ohsawa
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Patent number: 5721015Abstract: A coating method is disclosed, which comprises coating a base coating paint on a substrate, coating thereon a clear coating paint of a curing system different from that of the base coating paint in a wet-on-wet state, and then baking the resultant coatings, wherein a curing catalyst for curing the clear coating paint is incorporated into the base coating paint and wherein the curing catalyst has a boiling point of 150.degree. C. or higher, under 760 mmHg. The base coating paint comprising such a curing catalyst is also disclosed.Type: GrantFiled: March 28, 1996Date of Patent: February 24, 1998Assignees: Mazda Motor Corporation, Dainnippon Ink and Chemicals, IncorporatedInventors: Goro Iwamura, Shigeki Matsui, Norio Kosaka, Yoshiaki Marutani, Kazuhi Koga, Mika Ohsawa, Hiroshi Kubota
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Patent number: 5650475Abstract: The present invention relates to a low solvent content type-coating composition which provides the resultant coating with improved surface appearance, acid resistance, alkali resistance, weathering resistance, scuff resistance and solvent resistance, while the content of an organic solvent of the coating composition can be much reduced to 0 to 30% at 25.degree. C. The low solvent content type-coating composition comprises a vinyl oligomer having a blocked carboxyl group and an additional group selected from an epoxy group, a silanol group, a hydrolyzable silyl group and an acid anhydride group. The vinyl oligomer has a number average molecular weight (Mn) of 600 to 2000, a weight average molecular weight (Mw) of 600 to 5000, and a ratio of a weight average molecular weight/a number average molecular weight (Mw/Mn) of 1.0 to 2.5. The blocked carboxyl group and an additional group may be present in the same or different vinyl oligomers.Type: GrantFiled: July 31, 1995Date of Patent: July 22, 1997Assignee: Mazda Motor CorporationInventors: Yoshiaki Marutani, Tadamitsu Nakahama, Takashi Tomita, Hiroyuki Uemura, Kazuhi Koga, Mika Ohsawa, Goro Iwamura