Patent ID: 7022759
Filing Date: 2006-04-04
Classification: C09D

Abstract:
1. An aqueous coating composition comprising an ambient temperature crosslinkable water-dispersible polyester oligomer(s) and a dispersed polymer(s) having a measured weight average molecular weight ≧120,000 Daltons where the ratio of crosslinkable polyester oligomer(s) to the dispersed polymer(s) is in the range of from 90:10 to 20:80, and from 0 to 25% of co-solvent by weight of the composition, and wherein said composition when drying to form a coating has the following properties: i) an open time of at least 20 minutes at 23±2° C.; ii) a wet edge time of at least 10 minutes at 23±2° C.; iii) a thumb hard time of ≦48 hours at 23±20° C.; iv) a tack-free time of ≦20 hours at 23±2° C.; and v) an equilibrium viscosity of ≦3,000 Pa.s, at any solids content when drying in the range of from 20 to 55% by weight of the composition, using any shear rate in the range of from 9±0.5 to 90±5 s wherein the crosslinkable polyester oligomer(s) is ≦80% by weight soluble in water throughout a pH range of from 2 to 10, and has an acid value in the range of from 0 to 90 mg KOH/g.