Process for coating a metallic substrate
AssigneeKansai Paint Co., Ltd.
InventorsTadayoshi Tatsuno, Seiji Kashiwada, Komaji Matsui, Mituo Wakimoto, Ichiro Tabuchi
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Abstract
A process for coating a metallic substrate, which comprises applying an electrocoating paint to a metallic substrate, then applying a barrier coating comprising a crosslinking hardenable resin and being capable of forming a barrier coat film having an elongation at break of at least 150% and a stress at break of at least 20 kg/cm.sup.2 to the electrocoated film, optionally applying an intermediate coating paint to the barrier coat, and finally applying a top coating paint to the barrier coat or the intermediate coat.
Claims23
A process for coating a metallic substrate which comprises:
- applying an electrocoating paint to a metallic substrate, said electrocoating paint selected from the group consisting of a cationic electrocoating paint comprising as a main component a basic amino group-containing resin neutralized with an acid, the resin before neutralization having a base value of about 20 to about 200,
- then applying a barrier coating to the electrocoated surface, said barrier coating comprising a crosslinkable hardenable resin and being capable of forming a barrier coat film having an elongation at break of 180 to 1500% and a stress at break of 30 to 700 kg/cm.sup.2,
- and applying a top coating paint as the final paint coating.
Dependencies are inferred from the claim text.