AQUEOUS POLYMER GRAFTED LATEX

摘要

The present invention provides aqueous multistage copolymers, preferably, all acrylic and allylic or all acrylic copolymers, having as the outermost stage an acid functional, preferably, carboxyl or carboxylate functional, aqueous solution polymer and as the one or more remaining stage(s) a vinyl emulsion polymer, wherein the vinyl emulsion polymer stage(s) in the multistage copolymer comprises 5 wt. % or less of hydrophilic monomer, based on the total weight of monomers used to make the vinyl emulsion polymer stage(s). The multistage copolymer enables incorporation of a much higher amount of hydrophilic monomer into a vinyl emulsion copolymer. In addition, are methods of methods of making the multistage copolymers are provided.

主权项

1. An aqueous multistage copolymer in two or more stages comprising as the outermost stage an acid functional aqueous solution polymer having, in copolymerized form, 80 wt. % or more of hydrophilic monomers, based on the total weight of monomers used to make the solution polymer, and, as the one or more remaining stage(s) a vinyl emulsion polymer, wherein at least 30 wt. % of the solution polymer is covalently attached to one or more stages of the vinyl emulsion copolymer as shown by ultrafiltration and deionization followed by titration, and, further wherein, the vinyl emulsion polymer comprises in copolymerized form, 5 wt. % or less of hydrophilic monomer, based on the total weight of monomers used to make all stages of the vinyl emulsion copolymer.