Electrophotographic toner, manufacture of the same, electrostatic latent image developer, and image forming method

• Main Authors: HAMANO HIROKAZU, IMAI TAKASHI, FUKUSHIMA NORIHITO, ISHIHARA YUKA, DAIMON KATSUMI, SERIZAWA MANABU
• Format: Patent
• Language: English
• Published: 05.06.2003
• Edition: 7
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

The present invention uses a crystalline resin as a binding resin and provides a toner insuring excellent storability of a resulting image, a method of manufacturing the toner, an electrostatically charged image developer containing the toner, and an image forming method. In the electrophotographic toner containing toner mother particles comprising at least a binding resin and a colorant, a main component of said binding resin comprises a crystalline resin with a melting point in the range from 50 to 120° C. and an average volume particle size in the range from 3.0 to 7.5 mum, while an average value of the BET specific areas of said toner mother particles is in the range from 0.6 to 3.0 m2/g. The electrophotographic toner manufacturing method comprises the steps of coalescing or associating the binding resin particles with colorant particles, and cooling the aggregated particles at the rate of at least 1° C. per minute or more to a temperature below the crystallizing temperature of the binding resin to generate toner particles.