Method of making uniform polymer particles

A process for preparing substantially uniform porous polymer particles which comprises:

• forming a solution of said polymer comprising said polymer and a solvent therefore;
• subjecting said polymer solution to cyclic turbulences having a substantially constant frequency of about 1,000 to 40,000 Hz sufficient to mechanically form substantially uniform liquid droplets of said solution which have substantially the same sign electric charge;
• jetting these droplets from an orifice into a gas atmosphere at a substantially constant flow rate;
• passing said droplets through said gas atmosphere;
• and impinging said droplets on a surface of a coagulating liquid, which is a non-solvent for said polymer, is miscible with said solvent and has a surface tension sufficient to spontaneously substantially wet said liquid droplets;
• wherein the distance between said orifice and said surface of said coagulating liquid is such that said droplets are not substantially deformed by their collision with the surface of said coagulating liquid, and wherein said coagulating liquid acts to coagulate said polymer droplets.