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US 6,190,819 B1Granted
Electrostatic image-developing toner
AssigneeMitsubishi Chemical Corporation
InventorsNoriaki Takahashi, Osamu Ando
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Abstract
The present invention is directed to an electrostatic image-developing toner which is used for an electronograph and the like. The toner comprises at least core particles and fine particles being present on the surfaces of the core particles and has a mean particle size of 0.01-1 μm. The fine particles are polymer of a monomer and contain charge-controlling agent which is soluble in the monomer before polymerization.
Claims8
A method of manufacturing an electrostatic image-developing toner, comprising
- polymerizing by emulsion polymerization a monomer in the presence of a charge controlling agent to form a polymer of fine particles having a mean particle size of 0.01-1 μm, wherein said charge controlling agent is present in an amount of from 0.5 to 10 parts by weight based on 100 parts of said polymer;
- mixing said fine particles with core particles;
- adhering said fine particles to the surfaces of said core particles;
- wherein said charge-controlling agent is a compound represented by general formula (1):
- A—(X—B) n (1),
- wherein A represents an aromatic ring residue which may have a substituent;
- B represents an aromatic ring residue which may have a substituent, an aliphatic residue which may have a substituent, or a hydrogen atom;
- X represents —CONH—, —NHCO—, or —NHCONH—;
- and
- n represents an integer in the range from 1 to 3.
7 more elements
Dependencies are inferred from the claim text.