METHOD FOR PRODUCING EMULSION POLYMERISATES

摘要

The present invention relates to a method of producing emulsion polymer particles having a core-shell structure wherein at least one polyalkylene oxide containing additive is used in the core, and also to their use in paints, paper coatings, foams, crop protection agents, liquid inks and cosmetic compositions.

主权项

1. A method for producing emulsion polymer particles, the method comprising:
(i) performing a sequential polymerization to obtain a multistaged emulsion polymer in the form of particles; ii) neutralizing the particles with at least one base up to a pH of not less than 7.5; and iii) optionally polymerizing further shells comprising one or more nonionic ethylenically unsaturated monomer, wherein: the multistaged emulsion polymer comprises at least a core stage polymer and a sheath stage polymer; the core stage polymer comprises by way of polymerized units
from 5 to 99.5 wt %, based on the weight of the core stage polymer, of at least one hydrophilic ethylenically unsaturated monomer,from 0 to 95 wt %, based on the weight of the core stage polymer, of at least one nonionic ethylenically unsaturated monomer, and0.5 to 20 wt % of at least one nonionic polyalkylene oxide containing additive, based on the weight of the core stage polymer; and the sheath stage polymer comprises by way of polymerized units not less than 50 wt % of a nonionic ethylenically unsaturated monomer.