Xerox Corporation

Meurig W Williams

Christopher J AuClair

Deepak R Maniar

John R Laing

Christoper J AuClair

C D Zimmer

A process for the preparation of developer compositions which comprises (1) providing carrier particles consisting of a core with a coating thereover; (2) introducing the carrier particles into a blending apparatus; (3) adding to the blending apparatus fine toner particles with a diameter of from about 2 microns to about 10 microns, said particles being comprised of toner resin particles, pigment particles, and a charge enhancing additive; (4) affecting blending for a period of time sufficient to enable the classified toner particles to alter the tribogenerating ability of the surface of the carrier particles and become embedded therein; (5) subsequently adding to the resulting blended mixture toner particles of a diameter of from about 2 to about 18 microns, and comprised of toner resin particles, pigment particles, and a charge enhancing additive; and (6) blending for a period of form about 1 minute to about 5 minutes.

Process for developer compositions

Disclosed are toners comprised of a colorant or pigment in a resin of an acrylate polymer of the following typical formula: ##STR1## wherein R.sup.1 and R.sup.3 are independently selected from hydrogen, alkyl, or substituted alkyl radicals, R.sup.2 is independently selected from alkyl, aryl, substituted alkyl, substituted aryl radicals and R.sup.4, R.sup.5 and R.sup.6 are independently selected from hydrogen, alkyl, aryl, substituted alkyl, and substituted aryl; radicals x is an anion, n is a number of from 1 to about 20 and w, y and z are numbers of from 20 to about 1,400, or ##STR2## wherein R.sup.1 is independently selected from hydrogen, alkyl or substituted alkyl radicals; R.sup.2 is alkyl, aryl, substituted alkyl, or substituted aryl radicals; R.sup.3, and R.sup.4 are independently selected from hydrogen, alkyl, aryl, substituted alkyl or substituted aryl radicals, and y and z are numbers of from 20 to about 1,400.

Positively charged toners containing quaternary ammonium salts attached

Electrostatographic developer mixtures comprising finely-divided toner particles electrostatically clinging to the surface of carrier particles comprising a core having an outer coating thereon comprising a polyblend of a first polymer possessing negative triboelectric charging characteristics with respect to toner particles and a second polymer which possesses strong adhesive properties with respect to said core. The coated carrier particles have negative triboelectric charging properties and are particularly useful in development of negatively charged photoreceptors. Imaging processes are also disclosed.

Polyblend coated carrier materials

A finely-divided toner composition comprising a thermoplastic vinyl resin and a surface active additive selected from the group consisting of fluorinated surfactants. The toner composition possesses controlled triboelectric charging properties while its other bulk properties remain unaffected. Developer compositions and electrostatographic imaging processes are also disclosed.

Method of using electrostatographic toner composition with surfactant

Electrostatographic toner composition containing surfactant

A pressure-fixable developer utilizing a toner comprising a polycaprolactone having a number average molecular weight of between about 2,000 and about 15,000.

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Rochester, NY, United States of America

Meurig W Williams