US 4,981,759 AGranted

Coating method

AssigneeKansa Paint Co., Ltd.

InventorsEisaku Nakatani, Masaru Mitsuji, Yasuhiro Fujii, Katsuya Sera, Yuzo Miyamoto, Masafumi Kume, Tadayoshi Tatsuno, Akimasa Nakahata

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Abstract

A coating method, which comprises (i) applying to a substrate a multilayer film-forming cationic electrodeposition paint composed of (A) a cationic electrodepositable epoxy resin having a surface tension of 40 to 60 dynes/cm and being able to form a cathodically electrodepositable aqueous bath by neutralization with an acid, and (B) a nonionic film-forming resin having a surface tension of 25 to 45 dynes/cm, the weight ratio of resin (A) to resin (B) being from 60:40 to 98:2 and the surface tension of resin (A) being greater than that of resin (B), and curing the coated film by heating, (ii) applying a water-base or organic solvent-base colored paint as a first top coat, and (iii) applying as a second top coat a powder paint capable of forming a transparent film which may be colored.

Claims19

Dependent claims

A coating method, which comprises:

(i) applying to a substrate a multi-layer film-forming cationic electrodeposition paint comprising
(A) a cationic electrodepositable epoxy resin having a surface tension of 40 to 60 dynes/cm and being able to form a cathodically electrodepositable aqueous bath by neutralization with an acid,
(B) a nonionic film-forming resin having a surface tension of 25 to 45 dynes/cm, and
(C) a blocked polyisocyanate compound as a curing agent,
the weight ratio of resin (A) to resin (B) being from 60:40 to 98:2 and the surface tension of resin (A) being at least 5 dynes/cm higher than that of resin (B), and the resin (A) and the resin (B) being incompatible or difficultly compatible with each other, and curing the coated film by heating,
(ii) applying a water-base or organic solvent-base colored paint as a first top coat, and
(iii) applying as a second top coat a powder paint capable of forming a transparent film.

4 more elements

Dependencies are inferred from the claim text.