POSITIVE CHARGEABLE TONER

摘要

PURPOSE:To decrease the deterioration in the performance of a toner with age by using an electric charge controlling agent consisting of a nigrosine dye and amino group-contg. polymer. CONSTITUTION:An epoxy and/or polyester or other resin as well as coloring agent and charge controlling agent are incorporated into the toner. The charge controlling agent is constituted of the nigrosine dye and the amino group-contg. polymer such as styreneamino resin and/or succinic acid imideamine resin. The developer which provides the image quality of a high grade and decreases the deterioration of the performance with age is obtd. according to the above- mentioned constitution.