Addition interpolymers having improved stability and two-package compositions comprising such interpolymers and polyepoxides

A two-package polymeric composition comprising cocurable resinous components consisting essentially of:

• (a) a polyepoxide having a 1,2-epoxy equivalence greater than 1.0 and a molecular weight below about 4,000;
• and
• (b) an addition interpolymer containing pendent anionic salt groups, pendent carboxyl groups, pendent amine groups and pendent aminolysis-resistant organic groups, wherein said interpolymer is prepared by interpolymerizing from about 5 percent to about 60 percent by weight of at least one ethylenically unsaturated carboxylic acid monomer and from about 40 percent to about 95 percent by weight of at least one aminolysis-resistant organic monomer selected from the group consisting of monoolefinic and diolefinic hydrocarbons, unsaturated carboxylic acid amides, unsaturated organonitriles, non-methyl esters of alpha, alkylsubstituted carboxylic acids, and mixtures thereof so as to form an interpolymer having pendent carboxyl groups and pendent aminolysis-resistant organic groups and wherein said interpolymer is further reacted with sufficient alkylenimine to iminate from about 5 mole percent to about 95 mole percent of the carboxyl groups to form the pendent amine groups and sufficient base to form the pendent anionic salt groups and to result in a level of neutralization sufficient to give the interpolymer a pH of greater than about 6 in water,
• said components (a) and (b) being interreactive to form a hard, solvent-resistant crosslinked polymer.