Patent ID: 6503983
Filing Date: 2003-01-07
Classification: C08F

Abstract:
A process of free-radically initiated aqueous polymerization for preparing an aqueous polymer dispersion consisting essentially of,i) emulsifying, in an aqueous medium by means of dispersants, a mixture consisting essentially of a) a monomer or monomers having at least one ethylenically unsaturated group, at least one free-radical polymerization initiator and at least one stable N-oxyl radical, or b) a monomer or monomers having at least one ethylenically unsaturated group, and at least one compound which under the action of heat breaks down into a stable N-oxyl radical and into a free-radical partner which initiates the polymerization, to produce an aqueous emulsion of a mixture of a) or b) whose disperse phase consists predominantly of droplets with a diameter less than 500 nm, and ii) polymerizing the resulting aqueous emulsion by raising its temperature.