| 摘要 |
PROBLEM TO BE SOLVED: To provide a coating composition for steel plates, having good storage stability and giving a coating film having especially excellent acid resistance, alkali resistance and processability. SOLUTION: The water-based coating composition for steel plates comprises an aqueous dispersion of an acrylic-polyurethane resin obtained by the polymerization reaction of (B) a polymerizable component containing (b1) an alkyl (meth)acrylate expressed by general formula (1): CH<SB>2</SB>=CR<SP>1</SP>COOR<SP>2</SP>(R<SP>1</SP>is a hydrogen atom or a methyl group; and R<SP>2</SP>is a 1-18C alkyl group) in the presence of water and (A) a polyurethane resin containing (a1) a polyol composed of 86-96 wt.% polycarbonate diol and 14-4 wt.% polyol containing an anionic functional group, (a2) a polyisocyanate and (a3) an acrylic compound having a group containing an active hydrogen atom as reaction components. COPYRIGHT: (C)2008,JPO&INPIT
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