Title:
CLEAR COATING COMPOSITION AND METHOD FOR FORMING MULTILAYER COATING FILM
Document Type and Number:
WIPO Patent Application WO/2022/186049
Kind Code:
A1
Abstract:
The present invention provides a clear coating composition which forms a clear coating film serving as as an outermost layer of a multilayer coating film that is formed on the surface of an automobile, and which provides a clear coating film that has high chemical resistance, dry scratch resistance, high car wash scratch resistance and high recoat adhesion. The present invention provides a clear coating composition which contains a hydroxyl group-containing acrylic resin (A), a hydroxyl group-containing acrylic resin (B), a multifunctional isocyanate compound (C) and an aminoplast resin (D), wherein: the hydroxyl group-containing acrylic resin (A) has a glass transition temperature of 20°C to 35°C, a hydroxyl value of 100 mgKOH/g to 200 mgKOH/g, and a solubility parameter of 9.5 to 11.5, while containing 20% by mass to 40% by mass of an alicyclic (meth)acrylate relative to the total solid content of the hydroxyl group-containing acrylic resin (A); the hydroxyl group-containing acrylic resin (B) has a glass transition temperature of 15°C to 30°C, a hydroxyl value of 150 mgKOH/g to 250 mgKOH/g, and a solubility parameter of 10.5 to 12.5; the solubility parameter of the hydroxyl group-containing acrylic resin (A) is lower than the solubility parameter of the hydroxyl group-containing acrylic resin (B), and the difference therebetween is 0.5 or more; and the addition amounts of the components (C) and (D) are further controlled.
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Inventors:
TOGASHI MIZUHO (JP)
OHTONARI MASATOSHI (JP)
INOUE YUKI (JP)
MIWA YASUNORI (JP)
OHTONARI MASATOSHI (JP)
INOUE YUKI (JP)
MIWA YASUNORI (JP)
Application Number:
PCT/JP2022/007674
Publication Date:
September 09, 2022
Filing Date:
February 24, 2022
Export Citation:
Assignee:
NIPPON PAINT AUTOMOTIVE COATINGS CO LTD (JP)
International Classes:
C09D133/00; B05D1/36; B05D3/00; B05D7/24; C08G18/40; C08G18/62; C09D5/00; C09D7/61; C09D133/04; C09D161/20; C09D175/04
Domestic Patent References:
| WO2019107570A1 | 2019-06-06 |
Foreign References:
| US9187670B1 | 2015-11-17 | |||
| KR20130078644A | 2013-07-10 | |||
| CN111295425A | 2020-06-16 | |||
| JP2007039574A | 2007-02-15 | |||
| JPH09241582A | 1997-09-16 |
Attorney, Agent or Firm:
YAMAO, Norihito et al. (JP)
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