Curable coating agent composition

A curable coating agent composition comprising, with respect to 100 parts by mass of a component (A) as follows and a component (B) as follows in total, 95 to 65 parts by mass of the component (A), 5 to 35 parts by mass of the component (B), 0.1 to 10 parts by mass of a radical polymerization initiator as a component (C), 1 to 12 parts by mass of an ultraviolet absorber as a component (D) and 10 to 1,000 parts by mass of an organic solvent as a component (E),

• wherein the component (A) is an isocyanuric ring-containing (meth)acrylate mixture comprising a urethane adduct compound (a1) obtained by addition reaction of a hydroxyl-containing di(meth)acrylate compound represented by following general formula (1) and an isocyanate compound having two or more isocyanate groups in its molecule,
• and a tri(meth)acrylate compound (a2) represented by following general formula (2),
• (in general formula (1), R1, R2 and R3 each independently represents a divalent organic group having a carbon atom number of 2 to 10, R4 and R5 each independently represents a hydrogen atom or a methyl group, n1, n2 and n3 each independently represents a number of 1 to 3, and n1+n2+n3=3 to 9),
• (in general formula (2), R6, R7 and R8 each independently represents a divalent organic group having a carbon atom number of 2 to 10, R9, R10 and R11 each independently represents a hydrogen atom or a methyl group, n4, n5 and n6 each independently represents a number of 1 to 3, and n4+n5+n6=3 to 9),
• Wherein the component (B) is an organosilicon compound obtained by hydrolyzing and co-polycondensing a silicon compound (b1) represented by following general formula (3) and a silicon compound (b2) represented by following general formula (4) in a ratio of 0.3 to 1.8 mol with respect to 1 mol of the compound (b1),
• (in general formula (3), R12 is an organic group having an alkyl group having a carbon atom number of 1 to 6, an aralkyl group having a carbon atom number of 7 to 10, or an aryl group having a carbon atom number of 6 to 10, R13 is a divalent saturated hydrocarbon group having a carbon atom number of 1 to 6, R14 is a hydrogen atom or a methyl group, X is a hydrolyzable group, the X's may be the same or different, and n is 0 or 1),
• SiY4 (4)
• (in general formula (4), Y is a siloxane-bond-forming group, and the Y's may be the same or different).