Encapsulated toners and processes thereof
AssigneeXerox Corporation
InventorKaren A. Moffat
Life of this patent
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Abstract
An encapsulated toner composition comprised of a core comprised of a preformed polymer and/or monomer or monomers, a free radical initiator, pigment or dye particles, which core is dispersed in an emulsifier solution, and subsequently encapsulated in a polymeric shell and wherein the toner is stabilized by dispersants during core polymerization, which dispersant is of the following formula ##STR1## wherein x represents the number of repeating units.
Claims76
An encapsulated toner composition comprised of a core comprised of a preformed polymer and/or monomer or monomers, a free radical initiator, pigment or dye particles, which core is dispersed in an emulsifier solution, and subsequently encapsulated in a polymeric shell and wherein the toner is stabilized by dispersants during core polymerization, which dispersant is of the following formula ##STR7## wherein x represents the number of repeating units.
A heat fusible encapsulated colored toner composition comprised of a core comprised of (1) monomer or monomers, which are subsequently polymerized, preformed polymers, or mixtures thereof;
- (2) pigment, dye particles or mixtures thereof dispersing the aforementioned core in a stabilizer component subsequently encapsulating the resulting components in a polymeric shell where the disperant is of the following formula ##STR8## wherein x represents the number of repeating units.
A process for the preparation of encapsulated colored toners which comprises preparing a first core material comprising first pigment particles, core monomer or core monomers, and a free radical initiator;
- preparing a second core material which comprises second pigment particles, core monomer or monomers, and a free radical initiator, said second pigment particles being of a different color from that of the first pigment particles;
- dispersing the first and second core materials into an aqueous emulsifying phase;
- encapsulating separately the first core material and the second core material within polymeric shells by interfacial polymerization reactions between at least two shell monomers, of which at least one is soluble in aqueous media and at least one of which is soluble in organic media, wherein the polymeric shell encapsulating the first core material is of substantially the same composition as the polymeric shell encapsulating the second core material;
- stabilizing the encapsulated toner particles with a dispersant of the following formula ##STR9## wherein x represents the number of repeating units;
- and subsequently polymerizing the first and second core monomer or monomers via free radical polymerization, thereby enabling two encapsulated toner compositions of different colors.
A colored encapsulated toner composition comprised of a core comprised of a preformed polymer and monomer, a free radical initiator, pigment or dye particles, which core is dispersed in an emulsifier solution, and subsequently encapsulated in a polymeric shell and wherein the toner is stabilized by dispersants during core polymerization, which dispersant is of the following formula ##STR10## wherein x represents the number of repeating units.
Dependencies are inferred from the claim text.