Developing method.

摘要

A developing method for converting an electrostatic latent image on the surface of an electrostatic latent image holder (5) into a visible image by arranging the electrostatic latent image holder (5) for holding the electrostatic latent image thereon and a toner conveyer (l) for conveying non-magnetic one-component type toner (4) thereon an extremely small space apart from each other; applying the non-magnetic one-component type toner onto the toner conveyer; and transferring the toner (4) to the electrostatic image holder (5). The method satisfies the following requirements: the aforesaid developing agent is composed of non-magnetic type toner; the frictional charge quantity relative to the surface of the non-magnetic type toner is +30 SIMILAR l00 mu C; and fluidity is 5 g or less in terms of the toner amounting to 20 g but remaining on a l00-mesh sieve after it has been vibrated a rate of 3,000 V.P.M. and an amplitude of l mm for 30 seconds. The non-magnetic one-component type toner may be positively charged; the non-magnetic one-component type toner at least contains resin and a colouring agent, the resin satisfying the following requirements: the glass transition point is over 50 DEG C; the softening point is within the range of 110 DEG C-160 DEG C; and the frictional charge amount relative to the surface area is within the range of 25 SIMILAR l50 mu C/m<2>. The non-magnetic one-component type toner may be prepared by treating the surface of toner containing binder resin whose glass transition point is over 50 DEG C and whose softening point is within the range of ll0 SIMILAR l60 DEG C and a colouring agent with a silane coupling agent having an amino group. According to the above method, development fog and the scattering of the toner are prevented so that a visible image of good quality can be formed.