Polymer emulsions with a bimodal molecular weight distribution

摘要

A polymer emulsion comprises: (a) a continuous phase consisting of a poly(meth)acrylic acid ester with bimodal distribution of molecular weight; (b) a stabiliser for phase partition comprising a graft or block polymer of an olefin copolymer and methacrylic acid ester; and (c) a dispersed phase of olefin copolymer distributed in the continuous phase. The bimodal molecular wt. distribution of the poly(meth)acrylic acid ester is such that there is a crucial point in the high polymer region of a weight average molecular wt. of 50000-500000 and another crucial point in the range of 3000-30000. The olefin copolymer has a weight average molecular wt. of 5000-150000.