Semicarbazide derivative and a coating composition containing the same

A coating composition comprising (α) at least one member selected from the group consisting of a semi-carbazide derivative represented by formula (1) and a terminal-blocked form thereof:

• wherein R1represents a terminal isocyanate group-free polyisocyanate residue derived from a 3- to 20-mer oligomer of at least one diisocyanate selected from the group consisting of a linear or branched C2-C20 alkylene diisocyanate, a C5-C20 cycloalkylene diisocyanate which is unsubstituted or substituted with a C1-C18 alkyl group, a C1-C8 alkoxy group or a C1-C6 alkylene group, a C6-C20 arylene diisocyanate which is unsubstituted or substituted with a C1-C18 alkyl group or a C1-C8 alkoxy group, and a C8-C20 aralkylene diisocyanate which is unsubstituted or substituted with a C1-C18 alkyl group or a C1-C8 alkoxy group, or R1 represents a terminal isocyanate group-free triisocyanate residue derived from a C2-C20 alkylene diisocyanate substituted with a C1-C8 isocyanatoalkyl group;
• R2represents a linear or branched C2-C20 alkylene group, a C5-C20 cycloalkylene group, or a C6-C10 arylene group which is unsubstituted or substituted with a C1-C18 alkyl group or a C1-C8 alkoxy group;
• each R3independently represents a hydrogen atom or a C1-C20 alkyl group;
• n is zero or 1;
• and
• each of l and m is independently zero or a positive integer, provided that l and m satisfy the relationship 3≦(l+m)≦20,
• wherein said terminal-blocked form of the semicarbazide derivative represented by formula (1) has at least one blocked terminal group derived from the terminal group H2NR3N— in formula (1), said blocked terminal group being represented by the formula R9R8C═NR3N—, wherein each of R8 and R9 independently represents a hydrogen atom, a linear or branched C1-C20alkyl group, a C5-C20 cycloalkyl group, or a C6-C10 aryl group which is unsubstituted or substituted with a C1-C18 alkyl group or a C1-C8 alkoxy group, with the proviso that said R8 and R9together optionally form a ring structure, and
• (γ) a polycarbonyl compound comprising at least one member selected from the group consisting of a carbonyl group-containing polyurethane, an acetoacetylated polyvinyl alcohol, an acetoacetylated hydroxyalkyl cellulose, and a carbonyl group-containing copolymler of 0.1 to 30% by weight of (a) a carbonyl group-containing ethylenically unsaturated monomer with 70 to 99.9% by weight of (b) an ethylenically unsaturated monomer copolymerizable with said monomer (a).