申请人:Canon Kabushiki Kaisha
公开号:US05215848A1
公开(公告)日:1993-06-01
1. A carrier for electrophotography comprises carrier core particles and a coating resin material. The surfaces of the carrier core particles are each coated with the coating resin material and the coating resin material comprises a resin and a quaternary ammonium salt represented by the following formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represent an alkyl group, an aryl group or an aralkyl group and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 may be the same or different from each other; and A represents an organic anion, an isopolyacid ion or a heteropolyacid ion.
电子照相制版用载体包括载体核心颗粒和涂覆树脂材料。每个载体核心颗粒的表面都涂覆有涂覆树脂材料,涂覆树脂材料包括树脂和由以下公式表示的季铵盐:##STR1## 其中,R.sub.1,R.sub.2,R.sub.3和R.sub.4分别表示烷基,芳基或芳烷基,R.sub.1,R.sub.2,R.sub.3和R.sub.4可以相同或不同;A表示有机阴离子,异多钨酸盐或杂多酸盐。