Title:
水性塗料組成物及び塗膜形成方法
Document Type and Number:
Japanese Patent JP6419445
Kind Code:
B2
Abstract:
The present invention provides: an aqueous coating composition which has superior low-temperature curability compared with the conventional coating materials, also has excellent storage stability, and can be suitably applied to a coating system for forming a laminated coating film; and a method for producing a coated article, such as an automotive body, using the aqueous coating composition while keeping the properties and quality of the coated article at satisfactory levels. The present invention is an aqueous coating composition comprising (A) an aqueous resin, (B) a melamine resin and (C) a weakly acidic catalyst, wherein the aqueous resin (A) has a hydroxyl group value of 80 to 200 mgKOH/g in terms of a resin solid content, the melamine resin (B) contains 1.0 or more imino groups on average and 0.5 or more methylol groups on average per one melamine nucleus, the ratio of the mass of the aqueous resin (A) to the mass of the melamine resin (B) in the aqueous coating composition is 90/10 to 60/40 in terms of solid contents, and the amount of the weakly acidic catalyst (C) is 0.1 to 10.0 parts by mass relative to the total amount, i.e., 100 parts by mass, of the aqueous resin (A) and the melamine resin (B).
Inventors:
Ryoko Kinugawa
Hiroshi Okuda
Hiroshi Okuda
Application Number:
JP2014053833A
Publication Date:
November 07, 2018
Filing Date:
March 17, 2014
Export Citation:
Assignee:
Nippon Paint Automotive Coatings Co., Ltd.
International Classes:
C09D179/00; B05D7/24; C09D5/02; C09D7/63
Domestic Patent References:
| JP11209664A | ||||
| JP2010150459A | ||||
| JP2006265535A | ||||
| JP2007319767A | ||||
| JP8170046A | ||||
| JP1301768A | ||||
| JP2002097410A | ||||
| JP2002020682A |
Foreign References:
| WO2010119969A1 |
Attorney, Agent or Firm:
Atomi International Patent Office