Patent ID: 6294606
Filing Date: 2001-09-25
Classification: G03G

Abstract:
A process for preparing a latex polymer, comprising:(i) preparing an aqueous phase containing anionic surfactant in an amount less than 20% by weight of the total amount of anionic surfactant used in forming the latex polymer;(ii) preparing an emulsion of monomers in water with anionic surfactant;(iii) adding a portion of said monomer emulsion to said aqueous phase to initiate seed polymerization to form seed polymer, said portion containing less than 25% by weight of the total amount of monomer used in forming the latex polymer, said aqueous phase further containing a free radical initiator during the formation of the seed polymer; and(iv) adding an additional amount of said monomer emulsion to the composition formed in (iii) to complete emulsion polymerization thus forming a latex polymer.