Toner production process
AssigneeCanon Kabushiki Kaisha
InventorsTsuneo Nakanishi, Hirohide Tanikawa, Tsutomu Onuma, Nobuyuki Okubo, Kaori Hiratsuka
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Abstract
In a toner production process having at least a kneading step, a pulverization step using a mechanical grinding machine, and a classification step, the grinding means comprises a mechanical grinding machine having at least a rotor which is a rotator attached to the center rotating shaft and a stator which is provided around the rotor, keeping a constant gap between the stator and the rotor surface, the grinding machine being so constructed that a circular space formed by keeping the gap stands airtight, and the surface of at least one of the rotor and the stator is coated by the plating of a chromium alloy containing at least chromium carbide.
Claims24
A toner production process comprising the steps of:
- melt-kneading a mixture containing at least a binder resin and a colorant to obtain a kneaded product;
- cooling the kneaded product to obtain a cooled product;
- crushing the cooled product to obtain a crushed product;
- pulverizing a powder material comprising the crushed product, by means of a grinding means to obtain a pulverized product;
- and
- classifying the pulverized product by a classifying means;
- wherein;
- said grinding means comprises a mechanical grinding machine having at least a rotor which is a rotator attached to the center rotating shaft and a stator which is provided around the rotor, and keeping a constant gap between the stator and the rotor surface;
- and
- the surface of at least one of the rotor and the stator is coated by a plating of a chromium alloy containing at least chromium carbide.
Dependencies are inferred from the claim text.