Toner for electrostatic image and process of producing the same
AssigneeFuji Xerox Co., Ltd.
InventorsKouichi Kumashiro, Tetsu Torigoe, Chiaki Suzuki, Takaichi Kimura, Takayoshi Aoki
Life of this patent
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Abstract
A dry toner for developing electrostatic images is disclosed, which comprises a binder resin, a colorant and a wax consisting of a low molecular weight polypropylene and a high density polyethylene having a density of 0.96 or more, a molecular weight of 2,000 to 20,000 and an acid value of 1 or less, wherein the wax is dispersed in the binder resin to form domains having a size of 0.1 to 1.5 .mu.m. A process for producing the toner is also disclosed.
Claims6
A dry toner for developing electrostatic images, which comprises a binder resin, a colorant and a wax consisting of a low molecular weight polypropylene having a molecular weight from 1,000 to 10,000 and a high density polyethylene having a density of 0.96 or more, a molecular weight of 2,000 to 20,000 and an acid value of 1 or less, wherein said wax is dispersed in the binder resin to form domains having a size of 0.1 to 1.5 .mu.m, the weight ratio of the polypropylene to the polyethylene in the wax is 1/1 to 10/1, and said wax is present in an amount of 2 to 10% by weight based on the total weight of the binder resin and the wax.
A process of producing a toner for electrostatic images which comprises compounding a binder resin, a colorant, and a wax, adding water thereto, melt kneading them, cooling the kneaded product, pulverizing the cooled product and classifying the resulting powder, in which said was consists of a low molecular weight polypropylene having a molecular weight from 1,000 to 10,000 and a high density polyethylene having a density of 0.96 or more, a molecular weight of 2,000 to 20,000 and an acid value of 1 or less, the weight ratio of the polypropylene to the polyethylene in the was is 1/1 to 10/1, said was is compounded in an amount of 2 to 10% by weight based on the total weight of the binder resin and the wax, and said water is added in an amount of 0.5 to 5% by weight based on the weight of the kneaded product.
Dependencies are inferred from the claim text.