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US 6,284,422 B1Granted
Toner for developing electrostatic latent images and image-forming apparatus
AssigneeSharp Kabushiki Kaisha
InventorsHitoshi Nagahama, Toshihiko Murakami, Katsuaki Sumida, Junichi Saito
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Abstract
A toner for developing electrostatic latent images comprises a polyester resin and an electric charge controlling agent containing a chromium complex compound, wherein the polyester resin has an acid value Z of 15 to 30 (15<Z≦30) mgKOH/g and a hydroxyl value Y of 4 to 17 (4≦Y≦17) mgKOH/g.
Claims17
A toner for developing electrostatic latent images comprising:
- a polyester resin and
- an electric charge controlling agent containing a chromium complex compound,
- wherein the polyester resin has an acid value Z of 15 to 30 (15<Z≦30) mgKOH/g and a hydroxyl value Y of 4 to 17 (4≦Y≦17) mgKOH/g.
A toner for developing electrostatic latent images comprising:
- a colorant;
- a polyester resin;
- a negative charge controlling agent containing a chromium complex compound;
- and
- a positive charge controlling agent,
- wherein the polyester resin has an acid value Z of 15 to 30 (15<Z≦30) mgKOH/g and a hydroxyl value Y of 4 to 17 (4≦Y≦17) mgKOH/g, and
- fluidizing agent particles having a specific surface area of 90 to 240 m2/g are admixed to the toner in a proportion of 0.1 to 3.0 wt % with respect to the total weight of the toner.
4 more elements
A toner for developing electrostatic latent images comprising:
- a colorant;
- a polyester resin;
- a negative charge controlling agent containing a chromium complex compound;
- and
- a positive charge controlling agent,
- wherein the polyester resin has an acid value Z of 15 to 30 (15<Z≦30) mgKOH/g and a hydroxyl value Y of 4 to 17 (4≦Y≦17) mgKOH/g,
- fluidizing agent particles having a specific surface area of 90 to 240 m2/g are admixed to the toner in a proportion of 0.1 to 5.0 wt % with respect to the total weight of the toner, and
- positively electrifiable particles having the property of being positively electrified are further admixed to the toner.
5 more elements
Dependencies are inferred from the claim text.