ACRYLIC MODIFIED POLYMERIC OPACIFIERS FOR USE IN ORGANIC MEDIA

Disclosed are voided latex particles, useful as opacifying agents for coating compositions containing organic solvents. The particles have a hollow interior, which substantially maintains its integrity after the particles are placed in contact with an organic solvent at 25DEG C for 30 days. The particles also have a hydrophilic polymeric interior shell surrounding the hollow interior that is swellable with an aqueous swelling solution. The particles have first and second polymeric intermediate shells, surrounding the interior shell, formed from polymers that are different from each other and different from the interior shell polymer. Finally, the particles have an outer polymeric shell, surrounding the interior shells, which is formed from up to 100% by weight, as polymerized units, of methyl methacrylate. The interior shells and the outer shell each have a Tg greater than 60DEG C. Also disclosed is a multi-stage emulsion process for making the particles. 披露了空隙胶乳颗粒，其可用作用于含有有机溶剂的涂料组合物的遮光剂。所述颗粒具有中空内部，在将所述颗粒置于与有