Developer compositions with thermoset polymer coated carrier particles
AssigneeXerox Corporation
InventorJohn A. Creatura
Life of this patent
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Abstract
A carrier composition comprised of a core with a coating thereover comprised of a thermosetting polymer, or mixtures thereof.
Claims20
A carrier composition consisting essentially of a core with a coating thereover comprised of a thermoset polymer, and which coating contains a charge control component thereby enabling the triboelectric charge on the carrier particles to be preselected and wherein the conductivity thereof is from about 10.sup.-6 to about 10.sup.-17 (mho-cm).sup.-1.
A carrier composition consisting of a core with a coating thereover comprised of a thermoset polymer, contains a charge control component said coating or mixtures or mixtures thereof, which additives are present in an amount of about 0.1 to about 10 weight percent, and wherein there is enabled a carrier with a conductivity of from about 10.sup.-6 to about 10.sup.-17 (mho-cm).sup.-1, and with a triboelectric charge of from about -50 to about a positive 50 microcoulombs per gram.
A carrier composition comprised of a core with a coating thereover comprised of a thermoset polymer, the improvement residing in including in the thermoset polymer a charge additive thereby enabling a carrier with a conductivity of from about 10.sup.-15 to about 10.sup.-6 (mho-cm).sup.-1 and a triboelectric charge of from about a minus 20 to about a positive 20 microcoulombs per gram.
A carrier composition consisting of a core with a coating thereover comprised of a thermoset polymer, or mixtures thereof;
- and wherein said coating or mixtures thereof contains therein charge control additive components which components are present in an amount of about 0.1 to about 10 weight percent, and wherein there is enabled a carrier with a conductivity of from about 10.sup.-6 to about 10.sup.-17 (mho-cm).sup.-1, and with a triboelectric charge of from about -50 to about a positive 50 microcoulombs per gram;
- and wherein said carrier particles are prepared by (1) mixing a carrier core with a thermosetting polymer, and included in said thermosetting polymer said charge enhancing additive component;
- (2) dry mixing the carrier core particles and the polymer for a sufficient period of time enabling the polymer to adhere to the carrier core containing said charge enhancing additive;
- (3) heating the resulting mixture of carrier core and polymer to a temperature of between about 300.degree. F. and about 550.degree. F., whereby the polymer melts, crosslinks and fuses to the carrier core;
- and (4) thereafter cooling the resulting coated carrier particles.
Dependencies are inferred from the claim text.