Patent ID: 7642314
Filing Date: 2010-01-05
Classification: C09D

Abstract:
1. An acrylic latex composition comprising polymer particles that have a multimodal molecular weight distribution comprising at least a first, distinct, lower molecular weight peak and a second, distinct, higher molecular weight peak, wherein: the polymer particles have a total number average molecular weight of not more than about 60,000 Daltons, a total weight average molecular weight of not less than about 150,000 Daltons, and a total polydispersity of at least about 3.1; the first, distinct, higher molecular weight peak has a peak molecular weight from about 175,000 Daltons to about 400,000 Daltons; the second, distinct, lower molecular weight peak has a peak molecular weight from about 15,000 Daltons to about 60,000 Daltons; the ratio of the peak molecular weights between the first peak and the second peak is from about 3:1 to about 30:1; and the polymer particles: