METHOD FOR FORMING MULTILAYER COATING FILM

WIPO Patent Application WO/2023/149263

A1

The purpose of the present invention is to provide a method for forming a multilayer coating film which makes it possible to form a multilayer coating film having excellent metallic mottling resistance.　The method for forming a multilayer coating film comprises: (1) a step for applying a first aqueous coating material (P1) on an object to be coated to form a first coating film; (2) a step for applying a second aqueous colored coating material (P2) on the first coating film to form a second colored coating film that contains a binder component (AP2) and a lustrous pigment (BP2); (3) a step for applying a clear-coat coating material (P3) on the second colored coating film to form a clear-coat coating film; and (4) a step for heating a multilayer coating film that includes the first coating film, the second colored coating film, and the clear-coat coating film so as to cure the multilayer coating film all at once. The first aqueous coating material (P1) contains a compound (A) that has a hydroxyl group and an acid group and that has an acid value of 50-150 mgKOH/g, a hydroxyl value of 100-300 mgKOH/g, and a weight-average molecular weight of 500-8,000, a film-forming resin (B), and a crosslinking agent (C).

KUBO KENTARO (JP)
OMURA MASAHIRO (JP)

PCT/JP2023/001932

August 10, 2023

January 23, 2023

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KANSAI PAINT CO LTD (JP)

B05D1/36; B05D3/00; B05D5/06; B05D7/24; C09D5/00; C09D5/02; C09D201/00

WO2010095541A1	2010-08-26
WO2013151050A1	2013-10-10
WO2009013853A1	2009-01-29
WO2020137360A1	2020-07-02

JP2021041397A	2021-03-18
JP2013027820A	2013-02-07

AOKI, Atsushi et al. (JP)

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