Production of toner for developing electrostatic images
First Claim
1. A process for producing a toner for developing electrostatic images, comprising:
- pre-mixing binder resin particles, a colorant and resin particles carrying or containing inorganic fine powder to prepare a premix,melt-kneading the premix to obtain a kneaded product,cooling the kneaded product to obtain a colored resinous solid,pulverizing the colored resinous solid to obtain a pulverized product, andclassifying the pulverized product to obtain toner particles.
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Abstract
A toner for developing electrostatic images is produced through a process including the steps of: pre-mixing binder resin particles carrying or containing inorganic fine powder to prepare a premix; melt-kneading the premix to obtain a kneaded product; cooling the kneaded product to obtain a colored resinous solid; pulverizing the colored resinous solid to obtain a pulverized product; and classifying the pulverized product to obtain toner particles. The inclusion of the resin particles carrying or containing inorganic fine powder improves the performance of the pre-mixing to provide an improved dispersion of toner materials within the product toner particles. A fine powder fraction from the classifying step can also be recycled to the premixing step. The resin particles can be toner particles per se. The inorganic fine powder may preferably be silica fine powder treated with silicone oil.
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Citations
29 Claims
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1. A process for producing a toner for developing electrostatic images, comprising:
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pre-mixing binder resin particles, a colorant and resin particles carrying or containing inorganic fine powder to prepare a premix, melt-kneading the premix to obtain a kneaded product, cooling the kneaded product to obtain a colored resinous solid, pulverizing the colored resinous solid to obtain a pulverized product, and classifying the pulverized product to obtain toner particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification