Patent ID: 8119734
Filing Date: 2012-02-21
Classification: C08F,C08L,C09D,Y10T

Abstract:
1. A process for preparing an aqueous polymer dispersion, by a) preparing an initial charge of an aqueous emulsion of a long chain alkyl alcohol or a seed latex by polymerization of an alkyl (meth)acrylate in an aqueous medium comprising an emulsifier to a seed particle radius ranging from 3.0 to 20.0 nm b) adding from 25.0 to 45.0 parts by weight of a first composition comprising: where each of the radicals R polymerizing the added monomers to a conversion of at least 85.0% by weight, based on the total weight of components A), B), C) and D), c) adding from 35.0 to 55.0 parts by weight of a second composition comprising d) adding from 10.0 to 30.0 parts by weight of a third composition comprising: where the parts by weight given for the compositions b), c) and d) give a total of 100.0 parts by weight, e) each polymerization is carried out at a temperature in the range from above 60 to below 90° C. and f) the relative proportions of all of the substances are selected in such a way that the total weight of components A) to J), based on the total weight of the aqueous dispersion, is greater than 50.0% by weight, the product particles have a particle size ranging from 150 to less than 250 nm, and the amount of coagulate in the dispersion is 0.1% or less by wt, based on the total weight of the dispersion.