Preparation of radically initiated aqueous polymer dispersion

摘要

Radically initiated aqueous emulsion polymerisation process giving an aqueous polymer dispersion comprises emulsifying an ethylenically unsaturated group-containing compound(s) in aqueous medium using a dispersing agent and polymerising either using a radical polymerisation initiator in the presence of a stable N-oxyl radical(s) or using a compound(s) which decomposes on heating into a stable N-oxyl radical(s) and a radical polymerisation initiator. The emulsion obtained comprises droplets of diameter at most 500 nm and is polymerised by increasing the temperature. Also claimed are the obtained aqueous polymer dispersions.