Toner for electrostatic image development, electrostatic image developer, and toner cartridge

1. A toner for electrostatic image development comprising toner particles containing a binder resin,

wherein the binder resin includes an amorphous resin and a crystalline resin, and

wherein, in the toner particles, a Net intensity of elemental Mg measured by X-ray fluorescence analysis is from 0.40 to 1.20 inclusive, and a Net intensity of elemental Cl measured by X-ray fluorescence analysis is from 0.02 to 0.60 inclusive;

wherein in a cross-sectional observation of the toner particles, there are toner particles in which at least two domains of the crystalline resin satisfy at least one of condition (B1) and condition (B2) below:

condition (B1) that each domain of the crystalline resin measures 0.5 μm or more and 1.5 μm or less along a major axis thereof;

condition (B2) that at least one of the two domains of the crystalline resin measures that along a major axis thereof that 10% or more and 30% or less of a longest diameter of the toner particle, and

in a cross-sectional observation of the toner particles, there are toner particles in which at least two domains of the crystalline resin satisfy the conditions (A), (C), and (D) below:

condition (A) that each domain of the crystalline resin has an aspect ratio of 5 or more and 40 or less;

condition (C) that a line extended from the major axis of each domain of the crystalline resin makes an angle of 60° or more and 90° or less with a tangent to a surface of the toner particle at a point of contact between the extended line and the surface; and

condition (D) that lines extended from the major axis of the two domains of the crystalline resin cross each other at an angle of 45° or more and 90° or less.

2. The toner for electrostatic image development according to claim 1 , wherein the Net intensity of the elemental Mg is from 0.50 to 1.00 inclusive, and the Net intensity of the elemental C1 is from 0.03 to 0.40 inclusive.

3. The toner for electrostatic image development according to claim 1 , wherein the crystalline resin includes a polymer of α, ω-linear aliphatic dicarboxylic acid and α, ω-linear aliphatic diol.

4. The toner for electrostatic image development according to claim 3 , wherein the polymer of the α, ω-linear aliphatic dicarboxylic acid and the α, ω-linear aliphatic diol includes a polymer of 1,10-decanedicarboxylic acid and 1,6-hexanediol.

5. The toner for electrostatic image development according to claim 1 , wherein the toner particles contain a release agent, and

wherein the release agent is an ester wax.

6. The toner for electrostatic image development according to claim 5 , wherein, when a cross section of each of the toner particles is observed, a domain of the release agent is present at a depth of 50 nm or more from the surface of the each of the toner particles.

7. The toner for electrostatic image development according to claim 1 , wherein a ratio of a number of first toner particles to a total number of toner particles is 40% by number or more.

8. The toner for electrostatic image development according to claim 7 , wherein the ratio of the number of first toner particles to the total number of toner particles is 70% by number or more.

9. An electrostatic image developer comprising the toner for electrostatic image development according to claim 1 .

10. A toner cartridge containing the toner for electrostatic image development according to claim 1 , wherein the toner cartridge is detachably attached to an image forming apparatus.

11. A process cartridge that is attached to and detached from an image forming apparatus, the process cartridge comprising developing means that contains the electrostatic charge image developer according to claim 9 and develops, using the electrostatic charge image developer, an electrostatic charge image on a surface of an image carrier to form a toner image.

12. An image forming apparatus comprising:

an image holding member;

charging means for charging the surface of the image holding member;

electrostatic image forming means for forming an electrostatic image on the charged surface of the image holding member;

developing means that contains the electrostatic image developer according to claim 9 and develops the electrostatic image formed on the surface of the image holding member with the electrostatic image developer to thereby form a toner image;

transferring means for transferring the toner image formed on the surface of the image holding member onto a recording medium; and

fixing means for fixing the toner image transferred onto the recording medium.

13. An image forming method comprising:

charging the surface of an image holding member;

forming an electrostatic image on the charged surface of the image holding member;

developing the electrostatic image formed on the surface of the image holding member with the electrostatic image developer according to claim 9 to thereby form a toner image;

transferring the toner image formed on the surface of the image holding member onto a recording medium; and

fixing the toner image transferred onto the surface of the recording medium.