| 摘要 |
PROBLEM TO BE SOLVED: To provide an anode-depositing electrodeposition coating composition capable of forming a coating film having excellent scratch resistance on a metallic article made of e.g. aluminum or iron. SOLUTION: The objective composition contains colloidal silica. This electrodeposition coating composition having a solid content of 9%, pH of 8.7 and a liquid resistivity of 1,680Ω.cm can be produced by adding 7.2 pts. of triethylamine and 160.0 pts. of deionized water to 152.4 pts. of a resin liquid containing a polycarboxylic acid under agitation, continuing the agitation for 1 hr until the mixture becomes a homogeneous liquid, adding 50.0 pts. of Nikalac MX-40 (commercial name: melamine manufactured by Sanwa Chemical Co.), heating the mixture to 80 deg.C, stirring for 2 hr, cooling to 25 deg.C, adding 1,690.0 pts. of deionized water and 321.5 pts. of Snowtex UP (commercial name: colloidal silica manufactured by Nissan Chemical Industries Co.) and stirring for 30 min.
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