Carboxylic acid amide interpolymer-based coating compositions

Claim 1

In a coating composition comprising a solution or dispersion of an interpolymer consisting essentially of the interpolymerization product of: A. from about 2.5 percent to about 50 percent of an unsaturated carboxylic acid amide in units of the structure: ##STR4## wherein R' is hydrogen or lower alkyl and R is hydrogen or lower alkyl with at least 50 percent of the groups represented by R being lower alkyl; B. from about 1 percent to about 25 percent of an alpha, beta-ethylenically unsaturated carboxylic acid; and C. at least one other copolymerizable ethylenically unsaturated monomer containing a CH 2 ═C< group; wherein the improvement comprises the addition to said solution or dispersion of from about 2 percent to about 50 percent of by weight crosslinked polymeric microparticles formed by the free radical addition copolymerization of from about 0.5 percent to about 15 percent of an alpha, beta-ethylenically unsaturated monocarboxylic acid, at least one other copolymerizable ethylenically unsaturated monomer, and from about 0.5 percent to about 15 percent of a crosslinking monomer selected from the group consisting of epoxy group-containing compounds, alkylenimines, organoalkoxysilanes and mixtures thereof in the presence of a dispersing liquid which is a solvent for the polymerizable monomers but a non-solvent for the resultant polymer, and a dispersion stabilizer containing at least two segments of which one segment is solvated by said dispersing liquid and a second segment is of different polarity than said first segment and is relatively insoluble in said dispersing liquid.