Electrostatic-image developing toner, electrostatic image developer, toner cartridge, process cartridge, image-forming apparatus, and method for forming image
View Patent ↗An electrostatic-image developing toner contains a polyester resin prepared by addition reaction of a polycondensate of a carboxylic acid component and an alcohol component with an isocyanate-containing compound. The polycondensate has an active hydrogen group. The alcohol component includes a rosin diol represented by general formula (1): (wherein R 1 and R 2 are each independently hydrogen or methyl; L 1 , L 2 , and L 3 are each independently a divalent linking group selected from the group consisting of carbonyl, carboxyl, ether, sulfonyl, optionally substituted linear alkylenes, optionally substituted cyclic alkylenes, optionally substituted arylenes, and combinations thereof; L 1 and L 2 or L 1 and L 3 are optionally taken together to form a ring; and A 1 and A 2 are rosin ester groups).
1. An electrostatic-image developing toner comprising:
a polyester resin formed by a polycondensate of a carboxylic acid component and an alcohol component including a rosin diol represented by general formula (1), and
an isocyanate-containing compound:
wherein R 1 and R 2 are each independently hydrogen or methyl;
L 1 , L 2 , and L 3 are each independently a divalent linking group selected from the group consisting of carbonyl, carboxyl, ether, sulfonyl, optionally substituted linear alkylenes, optionally substituted cyclic alkylenes, optionally substituted arylenes, and combinations thereof; and
A l and A 2 are rosin ester groups.
2. The electrostatic-image developing toner according to claim 1 , wherein the rosin diol is synthesized from a rosin and a difunctional epoxy compound.
3. The electrostatic-image developing toner according to claim 2 , wherein the rosin is disproportionated.
4. The electrostatic-image developing toner according to claim 2 , wherein the rosin is hydrogenated.
5. The electrostatic-image developing toner according to claim 1 , wherein the carboxylic acid component includes an aromatic carboxylic acid.
6. The electrostatic-image developing toner according to claim 1 , wherein the isocyanate-containing compound is an isocyanate-containing polyester.
7. The electrostatic-image developing toner according to claim 1 , wherein the polyester resin has ester bonds and urethane bonds, the ratio of the urethane bonds to the ester bonds being about 3:1 to 1:10.
8. The electrostatic-image developing toner according to claim 7 , wherein the ratio of the urethane bonds to the ester bonds is about 1:1 to 1:5.
9. The electrostatic-image developing toner according to claim 1 , wherein the toner is manufactured by:
dissolving at least the polyester resin in an organic solvent to prepare an organic solvent solution;
suspending the organic solvent solution in an aqueous solvent to prepare a suspension; and
removing the organic solvent from the suspension.
10. An electrostatic image developer comprising the electrostatic-image developing toner according to claim 1 .
11. A toner cartridge attachable to and detachable from an image-forming apparatus, the toner cartridge containing the electrostatic-image developing toner according to claim 1 .
12. A process cartridge attachable to and detachable from an image-forming apparatus, the process cartridge comprising a developing unit that contains the electrostatic image developer according to claim 10 and that develops an electrostatic image formed on an image carrier with the electrostatic image developer to form a toner image.
13. A method for forming an image, comprising:
charging an image carrier;
forming an electrostatic image on the charged image carrier;
developing the electrostatic image formed on the image carrier with the electrostatic image developer according to claim 10 to form a toner image;
transferring the toner image from the image carrier to a transfer medium; and
fixing the toner image to the transfer medium.