Polyester resin for toner, electrostatic-image-developing toner, electrostatic image developer, toner cartridge, process cartridge, image forming apparatus, and image forming method

1. A polyester resin for a toner, comprising:

a polycondensate of a polyvalent carboxylic acid component and a polyhydric alcoholic component,

wherein the polyhydric alcoholic component contains a rosin diol represented by the following Formula (1) and a content of the rosin diol is 80 mole % to 100 mole % based on the total polyhydric alcoholic component:

wherein each of R 1 and R 2 independently represents a hydrogen atom or a methyl group;

L 1 represents a divalent linking group having the following Formula (I);

each of L 2 and L 3 independently represents a divalent linking group selected from the group consisting of carbonyl groups, carboxyl groups, ether groups, sulfonyl groups, substituted or unsubstituted chained alkylene groups, substituted or unsubstituted cyclic alkylene groups, substituted or unsubstituted arylene groups, and combinations thereof; and

each of A 1 and A 2 independently represents a rosin ester group:

2. A polyester resin for a toner, comprising:

a polycondensate of a polyvalent carboxylic acid component and a polyhydric alcoholic component,

wherein the polyhydric alcoholic component contains a rosin diol represented by the following Formula (1) and one or more of an aromatic alcohol having a structure represented by Formulas (I), (II) and (III) except for the rosin diol,

a total content of the rosin diol and the aromatic alcohol is 80% by mole to 100% by mole based on a total polyhydric alcoholic component, and

a content of the rosin diol is 10% by mole to 80% by mole based on the total polyhydric alcoholic component:

wherein, each of R 1 and R 2 independently represents a hydrogen atom or a methyl group,

L 1 represents a divalent linking group having the following Formula (I),

each of L 2 and L 3 independently represents a divalent linking group selected from the group consisting of carbonyl groups, carboxyl groups, ether groups, sulfonyl groups, substituted or unsubstituted chained alkylene groups, substituted or unsubstituted cyclic alkylene groups, substituted or unsubstituted arylene groups, and combinations thereof; and

A 1 and A 2 represent a rosin ester group:

3. An electrostatic-image-developing toner, comprising the polyester resin for a toner according to claim 1 .

4. An electrostatic image developer comprising the electrostatic-image-developing toner according to claim 3 .

5. A toner cartridge accommodating the electrostatic-image-developing toner according to claim 3 and attached detachably to an image forming apparatus.

6. A process cartridge accommodating the electrostatic image developer according to claim 4 , comprising:

a developing configured to develop an electrostatic image formed on a surface of an image holding member with the electrostatic image developer to form a toner image, and attached detachably to an image forming apparatus.

7. An image forming apparatus comprising:

an image holding member,

an electrically charging unit configured to electrically charge a surface of the image holding member,

an electrostatic image forming unit configured to form an electrostatic image on the surface of the image holding member,

a developing unit configured to accommodate the electrostatic image developer according to claim 4 and develop the electrostatic image with the electrostatic image developer to form a toner image,

a transferring unit configured to transfer the toner image to a recording medium, and

a fixing unit configured to fix the toner image on the recording medium.

8. An image forming method, comprising:

electrically charging a surface of an image holding member,

forming an electrostatic image on the surface of the image holding member,

developing the electrostatic image with the electrostatic image developer according to claim 4 to form a toner image,

transferring the toner image to a recording medium, and

fixing the toner image on the recording medium.

9. An electrostatic-image-developing toner, comprising the polyester resin for a toner according to claim 2 .

10. An electrostatic image developer comprising the electrostatic-image-developing toner according to claim 9 .

11. A toner cartridge accommodating the electrostatic-image-developing toner according to claim 9 and attached detachably to an image forming apparatus.

12. A process cartridge accommodating the electrostatic image developer according to claim 10 , comprising:

a developing configured to develop an electrostatic image formed on a surface of an image holding member with the electrostatic image developer to form a toner image, and attached detachably to an image forming apparatus.

13. An image forming apparatus comprising:

an image holding member,

an electrically charging unit configured to electrically charge a surface of the image holding member,

an electrostatic image forming unit configured to form an electrostatic image on the surface of the image holding member,

a developing unit configured to accommodate the electrostatic image developer according to claim 10 and develop the electrostatic image with the electrostatic image developer to form a toner image,

a transferring unit configured to transfer the toner image to a recording medium, and

a fixing unit configured to fix the toner image on the recording medium.

14. An image forming method, comprising:

electrically charging a surface of an image holding member,

forming an electrostatic image on the surface of the image holding member,

developing the electrostatic image with the electrostatic image developer according to claim 10 to form a toner image,

transferring the toner image to a recording medium, and

fixing the toner image on the recording medium.