| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermosetting powder coating composition for aluminum wheel alloy material that can be used as one coat type regardless whether the base material is treated with chromate or not and has excellent appearance, resistance to weather, high adhesion to the base material and excellent resistance to rust, particularly to filiform corrosion and provide aluminum wheel alloy material produced by applying the coating composition thereto. SOLUTION: A monomer mixture comprising 25-95 wt.% of (meth)acrylic alkyl ester, 5-25 wt.% of epoxy group-bearing acrylic monomer and 0-50 wt.% of other copolymerizable vinyl monomers is copolymerized to give an epoxy group-bearing acrylic resin with a glass transition temperature of 40-80 deg.C and a weight-average molecular weight of 3,000-30,000. The objective thermosetting powder coating composition characteristically comprises the resultant epoxy group-bearing acrylic resin and a curing agent bearing functional group reactive with epoxy group.
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