Curable coating compositions containing blends of carbamate-functional compounds

A curable coating composition, comprising:

• (a) a component selected from the group consisting of:
• (1) a compound having at least one carbamate group or urea group that is prepared by a step of reacting a mixture comprising:
• (A) a compound comprising a carbamate or urea group or a group that can be converted to a carbamate or urea group and a group that is reactive with (a)(1)(B) and
• (B) a polyisocyanate,
• (2) a compound having at least one carbamate group or urea group that is prepared by a step of reacting a mixture comprising:
• (A) a compound comprising a carbamate or urea group or a group that can be converted to a carbamate or urea group and an isocyanate group and
• (B) a compound having at least two groups reactive with isocyanate functionality,
• and mixtures thereof;
• (b) a polyester, polyurethane, or polyester-polyurethane copolymer comprising active hydrogen-containing functional groups that are reactive with component (c), and
• (c) a curing agent that is reactive with compound (a) and compound (b),
• wherein said carbamate group has a structure:
• ##STR11## in which R is H or alkyl, and further wherein said urea group has a structure:
• ##STR12## in which R' and R" are each independently H or alkyl, or R' and R" together form a heterocyclic ring structure.