Thermoplastic, aqueous latex paints having improved wet adhesion and freeze-thaw stability

Abstract

Copolymerizable amphoteric surfactants of the structural formula ##STR1## in which R.sub.1 =C.sub.1 -C.sub.2 alkyl, R.sub.2 =C.sub.1 -C.sub.2 alkyl, X.sup.- =SO.sub.3.sup.- or COO.sup.-, a=2-3, and b=1-6, are polymerized into copolymer latexes for use in paint formulations, in an amount of 1-3 parts per hundred parts by weight of monomers used to form the copolymer, to impart superior wet adhesion and freeze-thaw stability to the latex paints. The copolymer latexes contain no more than one part by weight carboxylic acid functionality per hundred part monomers. The monomers with which the amphoteric surfactants are copolymerized are selected from alkyl esters of acrylic and methacrylic acid, acrylic and methacrylic acid, styrene and mixtures thereof.

Dependencies are inferred from the claim text.