Toner for developing static charge image and method for preparation thereof
AssigneeZeon Corporation
InventorTokudai Ogawa
Life of this patent
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Abstract
A toner for development of electrostatic images, comprising colored particles containing at least a binder resin, a colorant and a softening agent, wherein the softening agent is an organic compound having a molecular weight of at least 1,000, a solubility of at least 5 g in 100 g of styrene as measured at 25° C., and an acid value of at most 10 mg KOH/g. The toner is excellent in fixing ability, shelf stability and flowability and permits forming images having high image quality. A production process thereof is also provided.
Claims14
A toner for development of electrostatic images, comprising colored particles containing at least a binder resin, a colorant and a softening agent, wherein the softening agent is an organic compound having:
- (A) a molecular weight of 1,000 to 1,800,
- (B) a solubility of at least 5 g in 100 g of styrene as measured at 25° C., and
- (C) an acid value of at most 10 mg KOH/g,
- and wherein the organic compound is a polyfunctional ester compound which is a condensate of a polyhydric alcohol having a functionality of at least 5 and a carboxylic acid having 13 to 25 carbon atoms.
A process for producing a toner for development of electrostatic images, comprising the step of subjecting apolymerizable monomer composition containing at least a polymerizable monomer, a colorant and a softening agent to suspension polymerization in an aqueous dispersion medium containing a dispersion stabilizer, said process comprising using, as the softening agent, an organic compound having:
- (A) a molecular weight of 1,000 to 1,800,
- (B) a solubility of at least 5 g in 100 g of styrene as measured at 25° C., and
- (C) an acid value of at most 10 mg KOH/g,
- and wherein the organic compound is a polyfunctional ester compound which is a condensate of a polyhydric alcohol having a functionality of at least 5 and a carboxylic acid having 13 to 25 carbon atoms.
Dependencies are inferred from the claim text.