Toner for development and method of producing toner

Details Toner for development and method of producing toner Toner for development and method of producing toner

2006-07-20

2009-08-11

Le, Hoa V (Department: 1795)

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Process of making developer composition

C430S137150, C430S137190

Reexamination Certificate

active

07572566

ABSTRACT:
According to the method of producing toner, toner is produced by (i) forming particles of a pigmented resin by applying shear stress to a mixture of a pigmented resin composition, an organic solvent, a polymer dispersing agent, and a hydrophobic medium, the organic solvent being capable of reducing viscosity of the pigmented resin composition, and said polymer dispersing agent having a glass transition point in a range of 50° C. to 80° C. and an SP value in a range of 8.5 to 10, (ii) distilling off the organic solvent, and (iii) separating the toner from the hydrophobic medium and drying the toner. With the above arrangement, the method makes it possible to (i) easily downsize toner particle without causing thermal decomposition of a resin or separation of a release agent, and (ii) produce toner that is small in particle size, excellent in humidity-resistance, and less likely to aggregate.

REFERENCES:
patent: 2004/0229147 (2004-11-01), Higuchi et al.
patent: 2003-5443 (2003-01-01), None

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