Toner and toner manufacturing method
A toner including a toner particle containing a binder resin and an external additive, wherein the external additive contains composite particles of an organosilicon polymer fine particle and a fatty acid metal salt.
1. A toner comprising:
a toner particle containing a binder resin, and
an external additive containing composite particles, wherein
said composite particles comprise an organosilicon polymer fine particle and a fatty acid metal salt.
2. The toner according to claim 1 , wherein when the composite particle is observed under a scanning electron microscope, 70 to 100 number % of the total composite particles have a coverage ratio of a surface of the fatty acid metal salt by the organosilicon polymer fine particle of 1 to 40% by area.
3. The toner according to claim 1 , wherein a number ratio of the composite particles is 0.001 to 1.000 per one particle of the toner particle.
4. The toner according to claim 1 , wherein a content of the organosilicon polymer fine particle is 0.5 to 10.0 mass parts per 100 mass parts of the toner particle, and
a content of the fatty acid metal salt is 0.05 to 1.0 mass part per 100 mass parts of the toner particle.
5. The toner according to claim 1 , wherein primary particles of the organosilicon polymer fine particle have a number-average particle diameter of 0.02 to 0.35 μm, and
primary particles of the fatty acid metal salt have a number-average particle diameter of 0.15 to 2.0 μm.
6. The toner according to claim 1 , wherein the organosilicon polymer fine particle has a structure of alternately bonded silicon atoms and oxygen atoms, and part of the organosilicon polymer has a T3 unit structure represented by R a SiO 3/2 , where R a represents a C 1-6 alkyl group or phenyl group, and
a ratio of area of a peak derived from silicon having the T3 unit structure relative to a total area of peaks derived from all silicon elements contained in the organosilicon polymer fine particle is 0.50 to 1.00 in 29 Si-NMR measurement of the organosilicon polymer fine particle.
7. The toner according to claim 1 , wherein the fatty acid metal salt includes zinc stearate.
8. A method of manufacturing the toner according to claim 1 , comprising the steps of:
mixing the organosilicon polymer fine particle with the fatty acid metal salt to obtain the composite particles, and
externally adding the composite particles to the toner particle.