Coated Carriers
AssigneeXerox Corporation
InventorsJohn G. VanDusen, Thomas R. Hoffend, K. Derek Henderson, Chieh-Min Cheng
Life of this patent
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Abstract
A process which comprises mixing a carrier core with a polymer core and polymer shell and wherein the polymer shell is present as a coating on said core and said polymer core, wherein said polymer core is generated by emulsification of and heating of monomer forming a seed latex; adding a portion of said seed latex to said emulsification mixture, followed by heating and adding another second portion of said seed latex; and wherein said shell is generated by emulsion polymerization of a monomer, followed by heating.
Claims32
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.
A carrier with a coating thereover and which coating is comprised of a polymer comprised of a polymer core and a polymer shell;
- or which coating is comprised of a shell polymer encapsulating said core polymer.
A process which comprises mixing a carrier core with a polymer core and polymer shell and wherein the polymer shell is present as a coating on said core and said polymer core, wherein said polymer core is generated by emulsification of and heating of monomer forming a seed latex;
- adding a portion of said seed latex to said emulsification mixture, followed by heating and adding another second portion of said seed latex;
- and wherein said shell is generated by emulsion polymerization of a monomer, followed by heating.
A process for the preparation of a coated carrier wherein the coating is generated from a latex monomer consisting essentially of (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 beating;
- (iii) to provide said shell polymer and admixing and heating with a carrier core.
Dependencies are inferred from the claim text.