摘要:
A resin particle having: a resin mother particle; and silica particles external added onto the surface of the resin mother particle, wherein a primary particles of the silica particles which have a volume average particle diameter of from 100 nm to 500 nm, a particle size distribution index of from 1.40 to 1.80 and an average circularity of from 0.5 to 0.85 has a regression line expressed by the following expression (1) with respect to the circularity and the volume average particle diameter (nm): Circularity=α×(Volume average particle diameter)/1000+β (1) wherein α is from −2.5 to −0.9, and β is from 0.8 to 1.2.
摘要:
The present invention provides an electrostatic latent image developing toner including a binding resin having an acidic polar group, a magnetic powder, and a carboxylic acid group-containing compound, the toner having a shape factor (SF1) of 110 to 140, wherein the carboxylic acid group-containing compound has a weight-average molecular weight of 1800 to 50,000 and an acid value of 150 to 600 mg KOH/g.
摘要:
There is provided an electrostatic latent image developing toner including a binder resin, a colorant, and a release agent, wherein the shape factor SF1 of the toner is within the range from 110 to 140, the volume average particle size of the toner is within the range from 1.2 μm to 4.8 μm, and the crystallinity of the release agent within the toner is within the range from 35 to 80. There is also provided a method for manufacturing such a toner.
摘要:
A non-magnetic one-component developer comprising a binder resin, a colorant and a charge controlling agent, the binder resin being a polyester resin which has a number average molecular weight of from 2,500 to 3,500, a weight average molecular weight of from 8,000 to 15,000 and a softening point of from 110.degree. C. to 130.degree. C., and which is substantially free from an ingredient insoluble in tetrahydrofuran, and the charge controlling agent comprising a metal complex salt compound represented by the following formula (1): ##STR1## wherein M represents a metal element selected from the group consisting of zinc, iron, nickel and cobalt, and R.sup.1 and R.sup.2 each represents a hydrogen atom or an alkyl group having from 1 to 6 carbon atoms.
摘要:
A method of manufacturing a silica particle dispersion, includes preparing a silica particle dispersion containing silica particles and a solvent, primary concentrating the silica particle dispersion, adding a hydrophobizing treatment agent to the silica particle dispersion after the primary concentrating, and secondary concentrating the silica particle dispersion after the adding.
摘要:
A method of manufacturing a silica particle dispersion, includes preparing a silica particle dispersion containing silica particles and a solvent, primary concentrating the silica particle dispersion, adding a hydrophobizing treatment agent to the silica particle dispersion after the primary concentrating, and secondary concentrating the silica particle dispersion after the adding.
摘要:
An electrostatic charge image developing toner includes: toner particles; and an external additive. The external additive contains sol-gel silica having a volume average particle diameter of from about 70 nm to about 400 nm and an average circularity of from about 0.5 to about 0.9, and a dielectric loss factor of the toner is from about 5×10−3 to about 30×10−3 when the toner is kept for 24 hours under the environment of a temperature of 28° C. and a humidity of 85%.
摘要:
A toner for developing an electronic latent image, including toner particles containing a binder resin and a colorant, and an external additive, is provided. The external additive contains silica formed by a sol-gel method of which the surface is subjected to hydrophobic treatment and which has an average primary particle size of 80 to 300 nm, a water content of 3 to 15% and a volume resistivity of 1×1013 &OHgr;cm or more. The invention further provides an image forming method and an image forming apparatus using the same. The toner for developing an electrostatic latent image is good in transferability over a long period of time and gives a high image quality without causing an image defect.
摘要:
The invention provides a method of producing silica particles, the method including preparing an alkali catalyst solution containing an alkali catalyst in a solvent including an alcohol, at a concentration of from about 0.6 mol/L to about 0.85 mol/L; and supplying tetraalkoxysilane into the alkali catalyst solution, and concurrently supplying an alkali catalyst into the alkali catalyst solution at a rate of from about 0.1 mol to about 0.4 mol per mole of the total amount of supply of the tetraalkoxysilane supplied in one minute.
摘要:
A resin particle including: a resin mother particle; and silica particles externally added onto a surface of the resin mother particle, wherein primary particles of the silica particles, the primary particles which have a volume average particle diameter of from 80 nm to 300 nm, a particle size distribution index of from 1.10 to 1.40, an average circularity of from 0.70 to 0.92 and an average circularity distribution index of from 1.05 to 1.50, and a proportion of the primary particles having an average circularity of 0.95 or more is not more 10% by number.