Magnetic toner

US8512925B2 · kind B2 · utility

Assignee

• Canon Kabushiki Kaisha · JP

Inventors

• Shuhei Moribe · Mishima, JP
• Katsuhisa Yamazaki · Numazu, JP
• Toru Takahashi · Kawasaki, JP
• Daisuke Tsujimoto · Soma, JP
• Masami Fujimoto · Kawasaki, JP

Key dates

• Filing date: Jan 19, 2012
• Grant date: Aug 20, 2013
• Expiry date: Feb 17, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G9/09783
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Provided is a magnetic toner capable of preventing electrostatic offset while attaining a high image quality by a high speed machine. The magnetic toner comprises magnetic toner particles, each of which contains a binder resin and a magnetic material, and a fine inorganic powder, in which the binder resin contains a polyester unit, and the magnetic toner has a dielectric loss factor at 40° C. and 100 kHz of 0.40 pF/m or more but 1.00 pF/m or less and a dielectric loss factor at 150° C. and 100 kHz of 0.50 pF/m or more but 4.00 pF/m or less.