Polymer latex for matte films

A method of preparing an aqueous suspension of organic particles having a core and shell, the method comprising:

• forming a pre-emulsion of one or more first monomers and an oil soluble free radical initiator in the presence of a colloidal dispersant, the one or more first monomers configured to form a polymer having a glass transition temperature (Tg) of about 80° C. or greater;
• homogenizing the pre-emulsion to form an emulsion having an average particle diameter of about 3 to about 12 microns;
• polymerizing the emulsion to form intermediate microsuspension of polymeric core particles having an average particle diameter of about 5 to about 12 microns;
• forming a second pre-emulsion with one or more second monomers having a surface tension greater than the surface tension of the intermediate polymer particles and configured to form a polymer having a glass transition temperature of about 30° C. or less;
• polymerizing the one or more second monomers of the second pre-emulsion in the presence of the intermediate polymer particles to form a polymeric shell at least partially surrounding the intermediate polymer particles and forming an aqueous suspension of organic particles having a core and shell;
• and
• wherein the organic particles have an average diameter of about 10 to about 50 microns.