Patent ID: 6399701
Filing Date: 2002-06-04
Classification: C08F,G03G

Abstract:
A process for preparing submicron sized particles comprised of poly(methyl methacrylate), comprising:(i) preparing an aqueous phase containing a free radical initiator in water by heating and stirring; (ii) preparing a monomer composition comprising at least 80% by weight methyl methacrylate and wherein the monomer composition further contains 1 to 10% by weight of a crosslinking agent; (iii) adding the monomer composition to the aqueous phase to initiate emulsion polymerization of the monomer composition, the adding being done at a rate such that from 0.05% to 5% by weight of the total weight of the monomer composition is added per minute; (iv) continuing heating and stirring following completion of the adding of the monomer composition to continue polymerizing the monomer composition; and (v) drying and recovering the submicron sized particles comprised of poly(methyl methacrylate), wherein the process is conducted in the absence of any surfactants.