Patent ID: 6605404
Filing Date: 2003-08-12
Classification: G03G

Abstract:
A process for the preparation of a coated carrier wherein the coating is generated from a latex monomer comprising (A)(i) emulsification and heating of monomer, chain transfer agent, water, surfactant, and initiator; (ii) generating a seed latex by the aqueous emulsion polymerization of a mixture comprised of part of the (i) monomer emulsion, which part is from about 0.5 to about 50 percent by weight, and an optional free radical initiator, and which polymerization is accomplished by (iii) heating and adding to the formed seed particles of (ii) the remaining monomer emulsion of (i), from about 50 to about 99.5 percent by weight of monomer emulsion of (i) and free radical initiator; (iv) to provide a carrier core polymer; and (B) forming a shell thereover said core generated polymer and which shell is generated by emulsion polymerization of a second monomer in the presence of said core polymer (iv), which emulsion polymerization is accomplished by (i) emulsification and heating of monomer, chain transfer agent, surfactant, and initiator; (ii) adding a free radical initiator and heating; (iii) to provide said shell polymer and admixing and heating with a carrier core.