Patent ID: 6348291
Filing Date: 2002-02-19
Classification: G03G

Abstract:
Toner comprising:toner particles containing binder resin and coloring agents; rutile/anatase mixed crystal titanium oxide externally added to the toner particles and hydrophobic processed; and hydrophobic silica externally added to the toner particles; wherein when assuming that the total amount of titanium oxide that is mixed with the toner particles is x1 weight portion, and the amount of titanium oxide that is strongly adhered to the toner particle surfaces is y1 weight portion, 90%&lE;(y1/x1)&lE;98%; wherein when assuming that the total amount of silica mixed with the toner particles is x2 weight portion, and the amount of the silica strongly adhered to the toner particle surfaces is y2 weight portion,90%&lE;(y2/x2)&lE;98%; andwherein the relation between x1 and x2 is x1&lE;x2, and when assuming that the toner particles are 100 weight portion, x1=0.1-3.0 weight portion, x2=0.1-3.0 weight portion, and y1/x1&gE;y2/x2.