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US 5,332,640 AGranted
Toner compositions with dendrimer charge enhancing additives
AssigneeXerox Corporation
InventorsJames M. Duff, Francoise M. Winnik, Guerino G. Sacripante, Anthony R. Davidson
Life of this patent
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Abstract
A dry toner composition comprised of resin particles, pigment particles, and a dendrimer charge enhancing additive.
Claims10
A dry toner composition consisting essentially of resin particles, pigment particles, and a dendrimer charge enhancing additive microparticle;
- and wherein said dendrimer is a radially symmetrical molecule comprising an initiator core, interior layers attached to the core, said layers comprising arms composed of repeating units, and terminal functional groups attached to the outermost repeating unit of each arm;
- wherein said dendrimer is of the first generation with 6 terminal amino groups and said microparticle has an average particle diameter of about 10.8 Angstroms or said dendrimer is of the third generation with 24 terminal amino groups and said microparticle has an average diameter of about 22 Angstroms.
A dry developer composition consisting essentially of resin particles, pigment particles, and a dendrimer charge enhancing additive microparticle;
- and wherein said dendrimer is a radially symmetrical molecule comprising an initiator core, interior layers attached to the core, said layers comprising arms composed of repeating units, and terminal functional groups attached to the outermost repeating unit of each arm;
- wherein said dendrimer is of the first generation with 6 terminal amino groups and said microparticle has an average particle diameter of about 10.8 Angstroms or said dendrimer is of the third generation with 24 terminal amino groups and said microparticle has an average diameter of about 22 Angstroms and carrier particles.
Dependencies are inferred from the claim text.