US 7,252,916 B2Granted

Electro-photographic developing agent

AssigneeSamsung Electronics Co., Ltd.

InventorsDuck-hee Lee, Jong-moon Eun

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Abstract

A non-magnetic one-constituent developing agent is an electro-photographic developing agent that provides high quality images without fogging, scattering of toners and ineffective development by maintaining stable charges and a uniform distribution of toners over an extended lifetime in a developing apparatus of an electro-photographic image processing device. In addition, the developing agent has deodorizing, anti-bacterial and sterilizing functions.

Claims22

Dependent claims

An electro-photographic developing agent comprising:

a binder resin;
a coloring agent;
a charge control agent;
and
an external additive comprising Ag particulates, wherein a first particle diameter of the Ag particulates is 10 to 500 nm,
and wherein one of a)-e):
a) the external additive further comprises at least one type of silica particles, wherein the at least one type of silica particles comprises at least a first silica particle and at least a second silica particle, wherein a first range of a diameter of the at least first silica particle is approximately 30 to 200 nm, and wherein a second, non-overlapping range of a diameter of the at least second silica particle is approximately 5 to 20 nm,
b) the external additive further comprises at least one type of titanium oxide particle, wherein the at least one type of titanium oxide particle comprises at least a first titanium oxide particle and at least a second titanium oxide particle, wherein a first range of a diameter of the at least first titanium oxide particle is approximately 30 to 200 nm, and wherein a second, non-overlapping range of a diameter of the at least second titanium oxide particle is approximately 5 to 20 nm,
c) the external additive further comprises at least one type of silicon carbide particles, wherein the at least one type of silicon carbide particles comprises at least a first silicon carbide particle and at least a second silicon carbide particle, wherein a first range of a diameter of the at least first silicon carbide particle is approximately 30 to 200 nm, and a second, non-overlapping range of a diameter of the at least second silicon carbide particle is approximately 5 to 20 nm,
d) the external additive further comprises at least one type of alumina particles, wherein the at least one type of alumina particles comprises at least a first alumina particle and at least a second alumina particle, wherein a first range of a diameter of the at least first alumina particle is approximately 30 to 200 nm, and a second, non-overlapping range of a diameter of the at least second alumina particle is approximately 5 to 20 nm, or
e) the external additive further comprises at least one type of polymer beads, wherein the at least one type of polymer beads comprises at least a first polymer bead and at least a second polymer bead, wherein a first range of a diameter of the at least first polymer bead is approximately 30 to 200 nm, and a second, non-overlapping range of the diameter of the at least second polymer bead is approximately 5 to 20 nm.

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Dependencies are inferred from the claim text.

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Abstract

An electro-photographic developing agent comprising:

a binder resin;
a coloring agent;
a charge control agent;
and
an external additive comprising Ag particulates, wherein a first particle diameter of the Ag particulates is 10 to 500 nm,
and wherein one of a)-e):
a) the external additive further comprises at least one type of silica particles, wherein the at least one type of silica particles comprises at least a first silica particle and at least a second silica particle, wherein a first range of a diameter of the at least first silica particle is approximately 30 to 200 nm, and wherein a second, non-overlapping range of a diameter of the at least second silica particle is approximately 5 to 20 nm,
b) the external additive further comprises at least one type of titanium oxide particle, wherein the at least one type of titanium oxide particle comprises at least a first titanium oxide particle and at least a second titanium oxide particle, wherein a first range of a diameter of the at least first titanium oxide particle is approximately 30 to 200 nm, and wherein a second, non-overlapping range of a diameter of the at least second titanium oxide particle is approximately 5 to 20 nm,
c) the external additive further comprises at least one type of silicon carbide particles, wherein the at least one type of silicon carbide particles comprises at least a first silicon carbide particle and at least a second silicon carbide particle, wherein a first range of a diameter of the at least first silicon carbide particle is approximately 30 to 200 nm, and a second, non-overlapping range of a diameter of the at least second silicon carbide particle is approximately 5 to 20 nm,
d) the external additive further comprises at least one type of alumina particles, wherein the at least one type of alumina particles comprises at least a first alumina particle and at least a second alumina particle, wherein a first range of a diameter of the at least first alumina particle is approximately 30 to 200 nm, and a second, non-overlapping range of a diameter of the at least second alumina particle is approximately 5 to 20 nm, or
e) the external additive further comprises at least one type of polymer beads, wherein the at least one type of polymer beads comprises at least a first polymer bead and at least a second polymer bead, wherein a first range of a diameter of the at least first polymer bead is approximately 30 to 200 nm, and a second, non-overlapping range of the diameter of the at least second polymer bead is approximately 5 to 20 nm.

8 more elements