| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a nonmagnetic single component developing yellow toner showing little decoloration and stable charge amounts during continuous printing with small fluctuation and maintaining high picture quality for a long time. SOLUTION: The nonmagnetic single component developing yellow toner contains a compound expressed by chemical formula I as a coloring agent, polyester resin as a binder resin, first inorganic fine particles having <=20 nm average primary volume particle size and second inorganic fine particles having 30 nm to 1μm average primary volume particle size and preferably containing silica subjected to the surface treatment with silicone oil or silane coupling agent. The polyester resin is obtained by condensation polymerization of ethylene oxide added bisphenol A preferably by >=30%, and more preferably by >=95% and a polyvalent carboxylic acid component selected from bivalent or higher valent carboxylic acid, bivalent or higher valent carboxylic acid anhydride and lower alkyl ester of bivalent or higher valent carboxylic acid.</p> |
