Importance

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Abstract

The present invention relates to an ultraviolet-curable coating composition comprising: (A) an ultraviolet curable four or more functional groups-containing polyfunctional (meth)acrylate having four or more (meth)acryloyl groups in the molecule and a number average molecular weight of 300 to 2,000, (B) a lactone-modified polymer of polyhydric alcohol mono(meth)acrylate containing 20 to 60 percents by weight of .epsilon.-caprolactone ring-opening addition product and having a hydroxyl value derived from the lactone modification of 100 to 180 mgKOH/g, and/or a lactone-modified polyester resin containing 10 to 50 percents by weight of lactone ring-opening addition product and having a hydroxyl value of 50 to 180 mgKOH/g, (C) a non-yellow polyisocyanate compound and/or an amino resin, (D) a light stabilizer and, (E) a photopolymerization initiator, wherein a weight ratio of component (A) against to a total weight of component Components (B) and (C) is 10:90 to 50:50, a weight ratio of component (B) against to component (C) is 90:10 to 20:80, and the components described above are formulated to obtain a cured paint film having a Knoop hardness of 10 to 18 and a molecular weight of intercrosslinking of crosslinked resin component in the cured paint film of 150 to 300.The ultraviolet-curable coating composition of the present invention can form the cured paint film having excellent scratch resistance, aesthetic decorative property, adhesion and gasoline resistance, and has high productivity of paint film.

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First Claim