Electrostatographic toner and developer compositions with phthalimide derivatives
AssigneeEastman Kodak Company
InventorsJohn C. Wilson, Steven M. Bonser, Hans W. Osterhoudt
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Abstract
This invention is directed to dry, negatively charged toner compositions and developer compositions which employ, as a charge-control agent, a compound selected from the group consisting of phthalimide, 4-aminophthalimide and 4-tert-butylphthalimide; as well as to methods of utilizing such compositions in electrostatographic imaging systems.
Claims20
Fusible, dry electrostatographic toner particles comprising a binder polymer and a charge-control agent wherein the binder polymer comprises a polyester having a glass transition temperature of 500 to 100.degree. C. and a weight average molecular weight of 20,000 to 100,000 and the charge-control agent is a compound selected from the group consisting of phthalimide, 4-aminophthalimide and 4-tert-butylphthalimide.
A dry, electrostatographic developer composition comprised of a mix of carrier particles and toner particles wherein the toner particles are comprised of a binder polymer and a charge-control agent wherein the binder polymer comprises a polyester having a glass transition temperature of 50.degree. to 100.degree. C. and a weight average molecular weight of 20,000 to 100,000 and the charge-control agent is a compound selected from the group consisting of phthalimide, 4-aminophthalimide and 4-tert-butylphthalimide and wherein each of the carrier particles comprises a core particle having an overcoat of a polymer comprising poly(methyl methacrylate) or a copolymer of butylstyrene and a C.sub.1 -C.sub.4 alkyl methacrylate.
Dependencies are inferred from the claim text.