PURPOSE: To accelerate the rising of the extent of electrostatic charge of a toner and to make the distribution of the extent of electrostatic charge narrow and the electrostatic chargeability uniform on a developer transferring body by incorporating a specified azo-metal complex into the toner.
CONSTITUTION: A toner is composed essentially of a resin (A), a colorant and an azo-metal complex (B) for providing negative charges to the resin A. The base polymer of the resin A has a mol.wt. distribution consisting of low and high mol.wt. components and carboxy groups in a polymer component corresponding to the low mol.wt. component have been cross-linked with multivalent metal ions in-between. The complex B is preferably a compd. represented by formula I and a compd. represented by formula II may be concretely used. In the formula I, M is the central metal atom of coordination, Ar is aryl and X is a counter ion.
IKEUCHI SATORU
MATSUBARA AKITOSHI
ARAI MITSUTAKA
