A PROCESS FOR PREPARING CORE-SHELL PARTICLES HAVING A POLYMER CORE AND A CONTINUOUS SILICA SHELL, AN AQUEOUS POLYMER DISPERSION OBTAINABLE BY SAID PROCESS, A REDISPERSIBLE POLYMER POWDER, AND A COMPOSITION COMPRISING THE REDISPERSIBLE POLYMER POWDER

摘要

The invention relates to a process for preparing core-shell particles having a polymer core and a continuous silica shell. The in situ formed core-shell architecture suppresses film formation of the polymer and simplifies the subsequent drying process. The finally obtained free flowing polymer powder exhibits improved redispersibility and storage stability and imparts building material compositions improved viscosity and faster skin-forming time.