Curable compositions comprising blends of active hydrogen-containing polymers and curing agents therefor are disclosed. The blends comprise 5 to 60 percent by weight of a free radical initiated addition polymer prepared from a mixture of monomers comprising:
1) an epoxy monomer represented by the formula: ##STR1## where R stands for tertiary aliphatic hydrocarbon group having 4 to 26 carbon atoms,
2) a polymerizable alpha, beta-ethylenically unsaturated carboxylic acid, and
3) optionally at least one other polymerizable alpha, beta-ethylenically unsaturated monomer.
Also present in the blend is 10 to 50 percent by weight of an acrylic copolymer different than the addition polymer mentioned above prepared from a mixture of monomers comprising:
1) a monomer of the formula: ##STR2## where R. sub. 2 is a polymerizable unsaturated hydrocarbon group, R. sub. 3 is hydrogen or C. sub. 1 to C. sub.