PURPOSE: To improve strength, toner contamination resistance, fluidity and environmental stability of a coating layer by applying on a nucleus particle with a specific coating resin.
CONSTITUTION: When the nucleus particle is applied with the coating resin, a particulate of a silicone rubber and/or a particulate of an insoluble and infusible silicone is allowed to contain in the coating resin. The particulate of the insoluble and infusible silicone is a particulate of silicone resin three- dimensionally cross-linked by executing dehydrating reaction or dealcoholating reaction with SiOH group, and does not have m.p., does not dissolve in organic solvent. And the particulate of silicone rubber obtained by substituting a part of CH3 group of chain crude rubber with -C6H5, -CH2-CH2CF3, -(CH2)2CN or the like, or cross-linking by organic peroxide, aliphatic azo compound to make rubber is used.
MATSUMURA YASUO
TAKANO HIROSHI
