Patent ID: 7919556

Claim:
An aqueous composition that achieves in use an early hardness development comprising: a. one or more copolymer having from 0.1% to 20 wt. %, based on the weight of the copolymer, of a copolymerized or functionalized acrylic or vinyl monomer having one or more acid functional group chosen from a phosphorus acid-functional group, a polymeric side chain containing multi-acid functional groups, a salt thereof, and a combination thereof, wherein the copolymer has a glass transition temperature of 20° C. or higher; b. one or more polyurethane dispersion containing at least 40 wt.%, based on the weight of polyurethane solids, of: i. a first polyol having a molecular weight of at least 1,000, wherein the first polyol is a polyether polyol, or ii. a second polyol chosen from a polyester, a polycaprolactam, a polycarbonate and a combination thereof, wherein the second polyol has a molecular weight of at least 2,000, or iii. a combination of one or more first polyol and one or more second polyol; and c. from 2.0 wt.% to 40.0 wt.%, based on the weight of copolymer solids of one or more coalescent having a normal boiling point of 190° C. or higher, the coalescent chosen from diacid esters, phosphate esters, isobutyrate esters, fatty ethers, alkoxylates of fatty acids, addition (co)polymer coalescents, or mixtures thereof, wherein the weight ratio of the copolymer solids to the polyurethane dispersion solids is from 25/75 to 90/10.