Curable resin compositions, coatings, and laminated plastics including the same

A radiation curable resin composition comprising:

• a composite resin (A) in which a polysiloxane segment (a1) having a polymerizable double bond, which has a structural unit represented by a general formula (1) and/or a general formula (2) as well as having a silanol group and/or a hydrolyzable silyl group, and a vinyl-based polymer segment (a2) having an alcoholic hydroxyl group are bound to each other through a bond represented by a general formula (3);
• a polyisocyanate (B), and
• a photopolymerization initiator, wherein
• the content of said polysiloxane segment (a1) is from 10 to 60% by weight with respect to the total solid content of the curable resin composition,
• the content of the polyisocyanate (B) is from 5 to 50% by weight with respect to the total solid content of the curable resin composition, and
• the content of the polymerizable double bond in said polysiloxane segment (a1) is from 3 to 20% by weight
• (in said general formulas (1) and (2), R1, R2, and R3 represent, each independently, any one of:
• a group having a polymerizable double bond selected from the group consisting of —R4—CH═CH2, —R4—C(CH3)═CH2, —R4—O—CO—C(CH3)═CH2, and —R4—O—CO—CH═CH2 (provided that R4 represents a single bond or an alkylene group of 1 to 6 carbon atoms);
• an alkyl group of 1 to 6 carbon atoms;
• a cycloalkyl group of 3 to 8 carbon atoms;
• an aryl group;
• or an aralkyl group of 7 to 12 carbon atoms, wherein at least one of R1, R2, and R3 is said group having a polymerizable double bond)
• (in the general formula (3), the carbon atom constitutes a part of said vinyl-based polymer segment (a2), and the silicon atom which is only bound to the oxygen atom constitutes a part of said polysiloxane segment (a1)).