Patent ID: 7833584

Claim:
An aqueous coating composition comprising a blend of 20 to 60 wt % of a multistage vinyl polymer (A) and 80 to 40 wt % of a vinyl oligomer-polymer (B) based on the total weight of (A) and (B); wherein the multistage vinyl polymer (A) comprises: 5 to 40 wt % of at least one hard polymer stage (i) having a Tg≧50° C.; and 95 to 60 wt % of at least one soft polymer stage (ii) having a Tg≦−5° C.; based on the total weight of (i) and (ii); and wherein the vinyl oligomer-polymer (B) comprises: 15 to 50 wt % of at least one alkaline soluble oligomer (iii); and 85 to 50 wt % of at least one vinyl polymer (iv) having a Tg in the range of from −20 to 30° C.; based on the total weight of (iii) and (iv).