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 quat. ammonium salt into the toner.
CONSTITUTION: A toner is composed essentially of a resin (A), a colorant and a quat. ammonium salt (B) for providing positive 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 salt B is a compd. represented by formula I, the pref. absorbance in the wavelength range of 400W700nm is ≤0.4 and a compd. represented by formula II may be concretely used. In the formula I, each of R1WR4 is 1W10C alkyl or aryl and X is a counter ion.
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IKEUCHI SATORU
MATSUBARA AKITOSHI
ARAI MITSUTAKA