Positively chargeable toner for two-component development
First Claim
1. A positively chargeable toner for two-component development comprising:
- a resin binder;
a colorant;
a releasing agent comprising a wax having a melting point of 50°
to 120°
C.; and
an external additive comprising a positively chargeable silica, the positively chargeable silica having an absolute deviation of an error of 0.1 or less, against an approximate straight line showing an adhesion state of silicon atoms to carbon atoms, and a free ratio of 5% or less, wherein the positively chargeable toner is usable together with a ferrite carrier having a saturation magnetization of from 40 to 100 Am2/kg.
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Accused Products
Abstract
A positively chargeable toner for two-component development comprising a resin binder; a colorant; a releasing agent comprising a wax having a melting point of 50° to 120° C.; and an external additive comprising a positively chargeable silica, the positively chargeable silica having an absolute deviation of an error of 0.1 or less, against an approximate straight line showing an adhesion state of silicon atoms to carbon atoms, and a free ratio of 5% or less, wherein the positively chargeable toner is usable together with a ferrite carrier having a saturation magnetization of from 40 to 100 Am2/kg. This positively chargeable toner is used for development of an electrostatic latent image formed in electrophotography, electrostatic recording method, electrostatic printing method, or the like.
13 Citations
16 Claims
-
1. A positively chargeable toner for two-component development comprising:
-
a resin binder;
a colorant;
a releasing agent comprising a wax having a melting point of 50°
to 120°
C.; and
an external additive comprising a positively chargeable silica, the positively chargeable silica having an absolute deviation of an error of 0.1 or less, against an approximate straight line showing an adhesion state of silicon atoms to carbon atoms, and a free ratio of 5% or less, wherein the positively chargeable toner is usable together with a ferrite carrier having a saturation magnetization of from 40 to 100 Am2/kg. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A process for preparing a positively chargeable toner for two-component development, comprising the steps of mixing an untreated toner comprising a resin binder, a colorant, and a releasing agent comprising a wax having a melting point of 50°
- to 120°
C., with an external additive comprising a positively chargeable silica, or a mixture of a positively chargeable silica and a negatively chargeable silica, thereby surface-treating the untreated toner with the external additive; and
thereafter sieving the resulting toner, wherein an entire silica in the resulting toner has an absolute deviation of an error of 0.1 or less, against an approximate straight line showing an adhesion state of silicon atoms to carbon atoms, and a free ratio of 5% or less. - View Dependent Claims (15, 16)
- to 120°
Specification