Encapsulated toner process utilizing phase separation
AssigneeXerox Corporation
InventorsRaj D. Patel, Guerino G. Sacripante, Grazyna Kmiecik-Lawrynowicz
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Abstract
A process for the preparation of an encapsulated toner composition comprised of a core and a shell thereover, which process comprises mixing an organic phase comprised of an olefinic monomer, pigment, and a first resin A soluble in the organic phase; dispersing the organic phase into microdroplets in an aqueous solution comprised of a surfactant; subjecting the resulting mixture to free radical polymerization by heating wherein the olefinic monomer is converted to a second resin B; and wherein said resin B is incompatible with said resin A and phase separates whereby a core and shell results.
Claims23
A phase separation process for the preparation of an encapsulated toner composition consisting essentially of a core and a shell thereover, which process consists essentially of mixing an organic phase comprised of an olefinic monomer, pigment, and a first resin A soluble in the organic phase;
- dispersing at a temperature of from about 5.degree. C. to about 60.degree. C. the organic phase into microdroplets in an aqueous solution comprised of a surfactant;
- subjecting the resulting mixture to free radical polymerization by heating at a temperature of from about 35.degree. C. to about 120.degree. C. wherein the olefinic monomer is converted to a second resin B;
- and wherein said resin B is incompatible with said resin A and phase separates whereby a core and shell results, and wherein said shell is formed from said second resin B which migrates to the surface of the toner.
A substantially nontoxic process for the preparation of an encapsulated toner composition with a core and a shell thereover, which process consists essentially of mixing an organic phase comprised of an olefinic monomer, pigment, and a first resin A soluble in the organic phase;
- dispersing at a temperature of from about 5.degree. C. to about 60.degree. C. the organic phase into microdroplets in an aqueous solution containing a surfactant;
- subjecting the resulting mixture to free radical polymerization by heating at a temperature of from about 35.degree. C. to about 120.degree. C. wherein the olefinic monomer is converted to a second resin B;
- and wherein said resin B is incompatible with said resin A and phase separates whereby a core and shell results, which shell is formed from resin B and is a polymer selected from the group consisting of methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, pentyl methacrylate, hexyl methacrylate, 2-ethyl hexyl methacrylate, dodecyl methacrylate, decyl methacrylate, nonyl methacrylate, lauryl methacrylate, stearyl methacrylate, styrene, isobutyl methacrylate, n-butyl methacrylate, butyl acrylate, and mixtures thereof;
- and wherein said dispersing is accomplished at a temperature of from about 5.degree. C. to about 60.degree. C.
Dependencies are inferred from the claim text.