Patent ID: 9481753
Filing Date: 2016-11-01
CPC Classification: C08F

Claim Text:
1. An aqueous multistage copolymer in two or more stages comprising as an 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, and 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.