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US 4,900,647 AGranted
Process for producing electrophotographic toner comprising micropulverization, classification and smoothing
AssigneeCanon Kabushiki Kaisha
InventorsNorio Hikake, Hitoshi Kanda, Yoshihiko Hyosu
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Abstract
A toner for producing electrostatic latent images is produced by smoothing classified resinous particles so that the ratio of the smallest diameter to the largest diameter thereof is 0.70-0.90, mixing the smoothed base particles (A) with modifier particles (B) to attach the modifier particles (B) to the surfaces of the base particles (A), and fixing the modifier particles (B) to the base particles (A) under the action of a mechanical impact force.
Claims20
A process for producing a toner for developing an electrostatic latent image comprising the steps of:
- pulverizing a resinous material comprising a binder resin using micro-pulverizing means to prepare resinous particles;
- classifying the resinous particles using classifying means to obtain classified particles having a predetermined particle size;
- removing surface inequalities of irregularities of the classified particles to yield smoothed base particles (A) having a ratio of the smallest diameter to the largest diameter thereof of 0.70-0.90;
- mixing the base particles (A) with modifier particles (B), thereby to attach the modifier particles (B) to the surfaces of the base particles (A);
- and
- using a mechanical impact force to fix modifier particles (B) to the surfaces of the base particles (A).
3 more elements
Dependencies are inferred from the claim text.