| 摘要 |
A curable coating composition comprises a hydroxy-functional component (A) having at least two hydroxy groups per molecule and an anhydride-functional component (B) having at least two carboxylic acid anhydride groups per molecule. At least one of the components (A) and (B) is a film-forming polymer. The coating composition contains amidine groups for accelerating the curing reaction between the hydroxy groups of component (A) and the anhydride groups of component (B). The amidine groups are present in the molecule of either of the components (A) or (B) and/or are present in the form of a separate compound containing-an amidine group. The component or compound containing an amidine group generally has formula (I) in which R1 represents hydrogen, or an organic group attached through a carbon atom, or an amine group which can be substituted, or a hydroxy group or etherified hydroxy group; R2 and R3 each independently represent hydrogen or an organic group attached through a carbon atom or are joined to one another to form (with the linking - N= C-N-) a heterocyclic ring; and R4 repres- ents hydrogen, an organic group attached through a carbon atom, or a hydroxy l group which can be etherified. Preferably, R2 and R3 are joined to form an imidazoline, imidazole, tetrahydropyrimidine , dihydropyrimidineor pyrimidine ring. |
