Process for electrodeposition of cationic resins
AssigneeKansai Paint Co., Ltd.
InventorsAkira Tominaga, Reijiro Nishida
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Abstract
An acid-neutralizable cationic electrodepositable resin composition comprising as a film-forming ingredient the reaction product of (A) an epoxy resin or an adduct of an epoxy resin with a primary amine and/or a secondary amine, (B) an amino-terminated condensation product between a maleinized fatty acid and a polyamine, and (C) a partially blocked polyisocyanate compound. The composition can form a cathodically electrodepositable aqueous bath by being neutralized with an acid, and can give a coated film having superior surface smoothness and corrosion resistance with a high throwing power.
Claims2
In a method of electrodeposition coating of an electrically conductive surface serving as a cathode which comprises passing an electric current across said cathode and an anode in contact with an aqueous electrodepositable composition;
- the improvement wherein said electrodepositable composition consists essentially of
- (i) as a film-forming ingredient, the reaction product of (A) an epoxy resin, or an adduct of an epoxy resin with a primary amine and/or a secondary amine, (B) an amino-terminated condensation product between a maleinized fatty acid and a polyamine, and (C) a partially blocked polyisocyanate,
- (ii) a water-soluble aqueous inorganic or organic acid as a neutralization agent for said reaction product (i), and
- (iii) an aqueous medium.
Dependencies are inferred from the claim text.