Toner to develop electrostatic latent images

A toner T1 to develop an electrostatic latent image, the toner T1 comprising:

• a core particle comprising a binder resin, a colorant, and a releasing agent, and
• an external additive adhering to an external surface of the core particle, the external additive comprising:
• an amount of sol-gel silica that is about 2 parts by weight relative to 100 parts by weight of the core particle;
• an amount of rutile titanium oxide that is from about 0.25 parts by weight to about 0.75 parts by weight relative to 100 parts by weight of the core particle;
• an amount of anatase titanium oxide that is from about 0.25 parts by weight to about 0.75 parts by weight relative to 100 parts by weight of the core particle;
• and
• an amount of strontium titanium oxide that is from about 0.25 parts by weight to about 0.75 parts by weight relative to 100 parts by weight of the core particle,
• wherein intensities of silicon and iron in the toner T1, as measured by X-ray fluorescence spectrometry (XRF), satisfy the following condition:
• 0.004≦[Si]/[Fe]≦0.009,
• wherein [Si] denotes the intensity of silicon and [Fe] denotes the intensity of iron.

A process cartridge comprising:

• an electrostatic latent image bearing member configured to bear an electrostatic latent image;
• and
• a developing device configured to develop the electrostatic latent image with a toner T1 to form a toner image, the toner T1 having a core particle comprising a binder resin, a colorant, and a releasing agent, and an external additive adhering to an external surface of the core particle, the external additive comprising a silica particle, an anatase titanium dioxide particle, a rutile titanium dioxide particle, and a strontium titanium oxide particle,
• wherein the toner T1 satisfies Conditions 1, 2, and 3 below, where 2θ is an angle of an x-ray diffraction detector and CPS is a number of counts per second of X-rays measured by the detector at the angle of 2θ:
• Condition 1:
• an X-ray diffraction (XRD) intensity of the toner T1 at an angle 2θ of 25.3° is larger than about 0.4 CPS to less than about 4 CPS;
• Condition 2:
• an XRD intensity of the toner T1 at an angle 2θ of 27.4° is larger than about 34 CPS to less than about 344 CPS;
• and
• Condition 3:
• an XRD intensity of the toner T1 at an angle 2θ of 32.3° is larger than about 92 CPS to less than about 1834 CPS.

A toner container, comprising a container having therein a toner T1, the toner T1 having a core particle comprising a binder resin, a colorant, and a releasing agent, and an external additive adhering to an external surface of the core particle, the external additive comprising a silica particle, an anatase titanium dioxide particle, a rutile titanium dioxide particle, and a strontium titanium oxide particle,

• wherein the toner T1 satisfies Conditions 1, 2, and 3 below, where 2θ is an angle of an x-ray diffraction detector and CPS is a number of counts per second of X-rays measured by the detector at the angle of 2θ:
• Condition 1:
• an X-ray diffraction (XRD) intensity of the toner T1 at an angle 2θ of 25.3° is larger than about 0.4 CPS to less than about 4 CPS;
• Condition 2:
• an XRD intensity of the toner T1 at an angle 2θ of 27.4° is larger than about 34 CPS to less than about 344 CPS;
• and
• Condition 3:
• an XRD intensity of the toner T1 at an angle 2θ of 32.3° is larger than about 92 CPS to less than about 1834 CPS.

An image forming apparatus, comprising:

• an electrostatic latent image bearing member configured to bear an electrostatic latent image;
• an electrostatic latent image forming device configured to form an electrostatic latent image on the electrostatic latent image bearing member;
• a developing device configured to develop the electrostatic latent image with a toner T1 to form a toner image, the toner T1 having a core particle comprising a binder resin, a colorant, and a releasing agent, and an external additive adhering to an external surface of the core particle, the external additive comprising a silica particle, an anatase titanium dioxide particle, a rutile titanium dioxide particle, and a strontium titanium oxide particle,
• wherein the toner T1 satisfies Conditions 1, 2, and 3 below, where 2θ is an angle of an x-ray diffraction detector and CPS is a number of counts per second of X-rays measured by the detector at the angle of 2θ:
• Condition 1:
• an X-ray diffraction (XRD) intensity of the toner T1 at an angle 2θ of 25.3° is larger than about 0.4 CPS to less than about 4 CPS;
• Condition 2:
• an XRD intensity of the toner T1 at an angle 2θ of 27.4° is larger than about 34 CPS to less than about 344 CPS;
• and
• Condition 3:
• an XRD intensity of the toner T1 at an angle 2θ of 32.3° is larger than about 92 CPS to less than about 1834 CPS;
• and
• a transfer device configured to transfer the toner image onto a recording medium;
• and a fixing device configured to fix the toner image on the recording medium.

An image forming method, comprising:

• forming an electrostatic latent image on an electrostatic latent image bearing member;
• developing the electrostatic latent image with a toner T1 to form a toner image, the toner T1 having a core particle comprising a binder resin, a colorant, and a releasing agent, and an external additive adhering to an external surface of the core particle, the external additive comprising a silica particle, an anatase titanium dioxide particle, a rutile titanium dioxide particle, and a strontium titanium oxide particle,
• wherein the toner T1 satisfies Conditions 1, 2, and 3 below, where 2θ is an angle of an x-ray diffraction detector and CPS is a number of counts per second of X-rays measured by the detector at the angle of 2θ:
• Condition 1:
• an X-ray diffraction (XRD) intensity of the toner T1 at an angle 2θ of 25.3° is larger than about 0.4 CPS to less than about 4 CPS;
• Condition 2:
• an XRD intensity of the toner T1 at an angle 2θ of 27.4° is larger than about 34 CPS to less than about 344 CPS;
• and
• Condition 3:
• an XRD intensity of the toner T1 at an angle 2θ of 32.3° is larger than about 92 CPS to less than about 1834 CPS;
• transferring the toner image onto a recording medium;
• and
• fixing the toner image on the recording medium.