Patent No. U.S. 7,833,584 B2
DSM IP Assets B.V. has obtained a patent for an aqueous coating composition comprised of a blend of 20% to 60% weight of a multistage vinyl polymer (A) and 80% to 40% weight of a vinyl oligomer-polymer (B) based on the total weight of (A) and (B); wherein the multistage vinyl polymer (A) is comprised of 5% to 40% weight of at least one hard polymer stage (i) having a Tg>50° C; and 95% to 60% weight 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) is comprised of 15% to 50% weight of at least one alkaline soluble oligomer (iii); and 85% to 50% weight 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).