Patent ID: 8772386

Claim:
An aqueous copolymer dispersion comprising a copolymer and a polyamine, the copolymer comprising, as copolymerized units, at least one nonionic monomer selected from C 6 -C 22 alkyl esters of (meth)acrylic acid and vinyl esters of C 9 -C 11 tertiary-alkanoic acids; and 0.05 to 3 wt % of a monomer having at lease one alkoxysilane functionality; wherein the amount of the nonionic monomer ranges from 15 wt % to less than 50 wt % and wherein the amount of the polyamine ranges from 0.1 to 2 wt %, by dry weight percentage based on the total dry weight of the copolymer dispersion; and wherein all monomer percentage are based on the dry weight of the copolymer.