Magnetic toner
A toner and magnetic technology, applied in the field of magnetic toner, can solve the problems of contamination and development of charging members, deterioration and the like
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[0024] Various exemplary embodiments, features, and aspects of the invention will be described in detail below with reference to the accompanying drawings.
[0025] Assuming the realization of high speed and long life of the printer, durability stability and image quality stability are required to be better than before. As a result of studies by the inventors of the present invention, it has been found that durability stability and image quality stability in the magnetic one-component jump developing method largely correlate with toner deterioration. As a result of further research, it has been found that toner deterioration in magnetic one-component jump development largely depends on friction between the developing sleeve and the toner regulating blade in the developing unit and the use of agitation in the developing unit. Embedding of external additives having small particle diameters caused by friction between toners in the additive circulation of the blades. As described...
manufacture example
[0211] Oxygen is supplied to the burner, the pilot burner is ignited, and then hydrogen is supplied to the burner and a flame is formed. Silicon tetrachloride as a material was put into a flame and vaporized. The flame hydrolysis reaction was performed under the conditions shown in Table 1, and the resulting silica powder was collected.
[0212] Thereafter, the obtained silica powder was transferred to an electric furnace, spread out in a thin layer, subjected to heat treatment at 700° C., and then sintered and aggregated.
[0213] Next, hydrophobizing treatment was applied so that 10 parts by mass of hexamethyldisilazane was added to 100 parts by mass of the obtained silica fine particles as a surface treatment agent.
[0214]
[0215] First external additives B to E were obtained similarly to first external additive A except that silicon tetrachloride flow rate, oxygen supply flow rate, hydrogen gas supply flow rate, silica concentration, and retention time were changed a...
Embodiment 1
[0253] 1.8 parts by mass of External Additive A as a first external additive and 0.5 parts by mass of External Additive L as a second external additive were externally mixed into 100 parts by mass of Magnetic Toner Particles 1 with a Henschel mixer, The mixture was sieved with a mesh having a pore size of 100 μm, and Magnetic Toner 1 having negative triboelectric charging characteristics was obtained. The physical properties of Magnetic Toner 1 obtained are shown in Table 4. The following evaluations were performed with the obtained toner.
[0254] [evaluate]
[0255] In consideration of further realization of higher speed and longer life of the printer, HP LaserJet Enterprise600 M603dn was modified to have a processing speed of 400 mm / s and used.
[0256] 982 g of Magnetic Toner 1 was filled into a predetermined process cartridge. The image output test was performed in a mode set in such a manner that the machine stopped once between two jobs with a vertical line pattern h...
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