Developing method

Abstract

Abstract 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∼l00µC; 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°C; the softening point is within the range of 110°C-160°C; and the frictional charge amount relative to the surface area is within the range of 25∼l50 µC/m². 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°C and whose softening point is within the range of ll0∼l60°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.

Inventors

• 👤 Tomura C/O Patent Division Shinya
• 👤 Okuyama C/O Patent Division Tetsuo
• 👤 Saito C/O Patent Division Mitsunaga
• 👤 Uehara C/O Patent Division Tsutomu

Bibliographic Details