Cationic electro-coating bath composition
AssigneesKansai Paint Co., Ltd., Honda Giken Kogvo Kabushiki Kaisha
InventorsHiroyuki Morishita, Yasuyuki Hirata, Shigeo Murofushi, Akira Tominaga
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Abstract
This invention provides, at a low cost, a low-pollution type cationic electro-coating bath composition which contains neither lead nor chromium, and which comprises cationic electrodeposition paint and, contained therein, a bismuth oxide paste, the amount of the bismuth oxide paste being within a range of 0.1 to 0.3% by weight as metal bismuth on the basis of total solid content of said cationic electro-coating bath composition, and the bismuth oxide paste being prepared by dispersing bismuth oxide (B) in an organic acid-neutralized aqueous dispersion of diethanol amine-added alicyclic epoxy resin (A).
Claims16
A cationic electro-coating bath composition which comprises a cationic electrodeposition paint and, contains therein, a bismuth oxide paste, the amount of the bismuth oxide paste being within a range of 0.1 to 0.3% by weight as metal bismuth on the basis of total solid content of said cationic electro-coating bath composition, and the bismuth oxide paste being prepared by dispersing a bismuth oxide (B) in an organic acid-neutralized aqueous dispersion of a diethanol amine-added alicyclic epoxy resin (A) which is a resin which is obtained from a reaction of epoxy resin (A1) which contains, per molecule, at least three epoxy group-containing functional groups having the following formula (1):
- with amine compound (A2) which contains diethanol amine, and phenolic compound (A3) which has, per molecule, at least one phenolic hydroxyl group.
Dependencies are inferred from the claim text.