PURPOSE: To obtain bright and transparent picture image and to improve light resistance by using a color toner dyed with a specified color toner dye for copying.
CONSTITUTION: An azo dye expressed by formula is used as the dye for the post-dyeing color toner. In formula, an aromatic ring A is a phenyl group which may have substituents, an heterocycle B is a pyridyl group which may have substituents, and R1 and R2 are same or different hydrogen atoms or alkyl groups or allyl groups which may have substituents. The color toner using this dye is obtd. by dyeing a toner resin with the dye expressed by formula and noinonic or anionic dispersant. The color toner has excellent transparency without influence of temp. on the triboelectric characteristics. Picture images of continuous copies obtd. by repetition of development are stable and the copy has good light resistance and rigidity.
AIDA ISAMU
TANAKA HIRONORI
MATSUZAKI YORIAKI
TAKUMA HIROSUKE
