Electrophotographic developer and image forming method
First Claim
1. An electrophotographic developer, comprising:
- magnetic particles, and a toner containing toner particles charged with the magnetic particles and having a particle diameter distribution, wherein the toner exhibits cumulative toner weight distributions of both square of charge amount q2 [C2] and attachment force F [N] per particle with respect to a representative toner particle diameter in the particle diameter distribution, giving a linear approximation of plots of the attachment force F [N] versus the square of charge amount q2 [C2] per particle at a plurality of corresponding cumulative toner weight ratios, and the linear approximation satisfies a slope of the linear approximation of from 5×
1020 to 3×
1022 and a squared multiple correlation coefficient (R2) of 0.6 or more.
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Abstract
An electrophotographic developer including: magnetic particles, and a toner containing toner particles charged with the magnetic particles and having a particle diameter distribution, wherein the toner exhibits cumulative toner weight distributions of both square of charge amount q2 [C2] and attachment force F [N] per particle with respect to a representative toner particle diameter in the particle diameter distribution, giving a linear approximation of plots of the attachment force F [N] versus the square of charge amount q2 [C2] per particle at a plurality of corresponding cumulative toner weight ratios, and the linear approximation satisfies a slope of the linear approximation of from 5×1020 to 3×1022 and a squared multiple correlation coefficient (R2) of 0.6 or more. As a result, the developer allows good control of transferability under the control of an electric field and allows a reduction in transfer residual amount of the toner.
4 Citations
9 Claims
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1. An electrophotographic developer, comprising:
- magnetic particles, and a toner containing toner particles charged with the magnetic particles and having a particle diameter distribution, wherein the toner exhibits cumulative toner weight distributions of both square of charge amount q2 [C2] and attachment force F [N] per particle with respect to a representative toner particle diameter in the particle diameter distribution, giving a linear approximation of plots of the attachment force F [N] versus the square of charge amount q2 [C2] per particle at a plurality of corresponding cumulative toner weight ratios, and the linear approximation satisfies a slope of the linear approximation of from 5×
1020 to 3×
1022 and a squared multiple correlation coefficient (R2) of 0.6 or more. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- magnetic particles, and a toner containing toner particles charged with the magnetic particles and having a particle diameter distribution, wherein the toner exhibits cumulative toner weight distributions of both square of charge amount q2 [C2] and attachment force F [N] per particle with respect to a representative toner particle diameter in the particle diameter distribution, giving a linear approximation of plots of the attachment force F [N] versus the square of charge amount q2 [C2] per particle at a plurality of corresponding cumulative toner weight ratios, and the linear approximation satisfies a slope of the linear approximation of from 5×
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8. An electrophotographic developer, comprising:
- magnetic particles, and a toner containing toner particles charged with the magnetic particles and having a particle diameter distribution, wherein the toner exhibits cumulative toner weight distributions of both square of charge amount q2 [C2] and attachment force F [N] per particle with respect to three representative particle diameters including a cumulative 10% by number particle diameter, a cumulative 50% by number particle diameter (cumulative 50% by number-average particle diameter) and a cumulative 90% by number particle diameter as counted from the smaller particle diameter side;
wherein the square of charge amount q2 [C2] and attachment force F [N] give a linear approximation of a total of 15 plots of the attachment force F [N] versus the square of charge amount q2 [C2] per particle at five cumulative toner weight ratios of 0.1, 0.3, 0.5, 0.7 and 0.9 is determined, and the linear approximation satisfies a slope of the linear approximation of from 5×
1020 to 3×
1022 and a squared multiple correlation coefficient (R2) of 0.6 or more.
- magnetic particles, and a toner containing toner particles charged with the magnetic particles and having a particle diameter distribution, wherein the toner exhibits cumulative toner weight distributions of both square of charge amount q2 [C2] and attachment force F [N] per particle with respect to three representative particle diameters including a cumulative 10% by number particle diameter, a cumulative 50% by number particle diameter (cumulative 50% by number-average particle diameter) and a cumulative 90% by number particle diameter as counted from the smaller particle diameter side;
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9. An image forming method, comprising:
- developing an electrostatic latent image on an image carrier with a toner containing toner particles triboelectrically charged with magnetic particles and having a particle diameter distribution to form an image of the toner on the image carrier, and transferring the image of the toner onto an intermediate or a final transfer medium;
wherein the toner on the image carrier exhibits cumulative toner weight distributions of both square of charge amount q2 [C2] and attachment force F [N] to the image carrier per particle with respect to a representative toner particle diameter in the particle diameter distribution, giving a linear approximation of plots of the attachment force F [N] versus the square of charge amount q2 [C2] per particle at a plurality of corresponding cumulative toner weight ratios, and the linear approximation satisfies a slope of the linear approximation of from 5×
1020 to 3×
1022 and a squared multiple correlation coefficient (R2) of 0.6 or more.
- developing an electrostatic latent image on an image carrier with a toner containing toner particles triboelectrically charged with magnetic particles and having a particle diameter distribution to form an image of the toner on the image carrier, and transferring the image of the toner onto an intermediate or a final transfer medium;
Specification