Urethane coating composition for metal substrates

A urethane coating composition, comprising:

• (1) a polyol that is the reaction product of
• a) a resin having the general formula (I)
• wherein:
• each A is independently a substituted or unsubstituted divalent aliphatic group having from 1 to about 6 carbon atoms, an unsubstituted divalent aromatic group having from 6 to about 10 carbon atoms, a divalent aromatic group substituted with an organic group having from 1 to 4 carbon atoms (C1-C4 alkyl or alkenyl), a halogen, —OR′O, wherein R′ is unsubstituted or substituted C1-C4 alkyl, —C(O)—, —O—, —S—, —S(O)—, or —S(O)2;
• each Ph is independently a an unsubstituted phenylene ring, or a phenylene ring substituted with H, C1-C4 alkyl, Cl, Br, or —OR;
• each R is independently H, C1-C4 alkyl, or an epoxide of the formula
• wherein R1 is independently H, unsubstituted C1-C4 alkyl, or C1-C4 alkyl substituted with —OH, or C1-C4 alkoxy;
• m is 0 or 1;
• and
• n is between 0 and 6;
• and
• (b) an acid or diol present in an amount sufficient to react substantially all the epoxide groups, if present, in component (a), wherein the reaction is carried out in the presence of a reaction catalyst;
• and
• an isocyanate-functional compound.