G - Physics – 03 – G
Patent
G - Physics
03
G
32/12, 117/2, 96
G03G 9/08 (2006.01) G03G 9/083 (2006.01) G03G 9/087 (2006.01) G03G 13/16 (2006.01) G03G 15/16 (2006.01)
Patent
CA 2029034
A toner for developing electrostatic images, comprises a binder resin and a colorant, wherein the binder resin comprises a vinyl copolymer having an acid anhydride group, and the binder resin has a total acid value (A) of 2 - 100 mgKOH/g and a total acid value (B) attributable to acid anhydride group of below 6 mgKOH/g so that [(B)/(A)] x 100 is 60 % or less. Because the binder resin has a specified acid value partly attributable to acid anhydride group, the toner is provided with an adequate balance between chargeability and dischargeability, so that the toner shows a stable performance under various environmental conditions. The toner is particularly advantageously constituted as a magnetic toner of fine particle sizes suitably used under application of unsymmetrical alternating bias electric field.
Akashi Yasutaka
Tanikawa Hirohide
Taya Masaaki
Uchiyama Masaki
Unno Makoto
Canon Kabushiki Kaisha
Ridout & Maybee Llp
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