Toner for electrostatic charge image development, electrostatic charge image developer, toner cartridge, process cartridge and image forming device

A toner for electrostatic charge image development comprising:

• toner particles;
• and
• fatty acid metal salt particles,
• a content of the fatty acid metal salt particles being from about 0.2 parts by weight to about 5 parts by weight with respect to 100 parts by weight of the toner particles, and, in a particle size distribution of the fatty acid metal salt particles, a proportion of the fatty acid metal salt particles having a particle diameter of 25 μm or more is from about 4.0% by weight to about 30.0% by weight with respect to a total weight of the fatty acid metal salt particles, and a proportion of the fatty acid metal salt particles having a particle diameter of 40 μm or more is about 2.0% by weight or less with respect to the total weight of the fatty acid metal salt particles, and
• the toner satisfies the following formulas
• 0.015%≦A≦0.300%
• B≦0.03%
• where:
• A represents a weight of the fatty acid metal salt particles remaining on a sieve having an opening of 25 μm when the toner is sieved with the sieve having an opening of 25 μm with respect to a total weight of the toner under the following conditions:
• an elemental analysis of a surface of the toner particles is performed by X-ray fluorescence spectroscopy to determine a weight, if any, of particles other than the fatty acid metal salt particles in the toner,
• 30.0 g of toner is added into a beaker containing 500 g of a 3.0% by weight aqueous sodium dodecylbenzene sulfonate solution while stirring, and a toner dispersion liquid is prepared using an ultrasonic cleaner,
• a Buchner funnel for φ70 mm filter paper is attached to a suction bottle, and a stainless-steel sieve having an opening of 25 μm, φ75 mm, and a height of 20 mm for a test with a tare weighted is set onto the Buchner funnel, a gap between the sieve and a side surface of the Buchner funnel is sealed, and the toner dispersion liquid is poured into the sieve from above while air is suctioned from the suction bottle,
• subsequently, 500 g of a 1.0% by weight aqueous sodium dodecylbenzene sulfonate solution is used for rinsing an inner surface of the Buchner funnel and a mesh portion of the sieve to remove the toner adhered to the mesh portion of the sieve,
• the mesh portion of the sieve is further rinsed with a mixed solution of ion exchange water and ethanol at a weight ratio of 80:20,
• the sieve is detached from the Buchner funnel and is air-dried,
• a weight of the sieve after being dried is weighed, and a difference in the sieve weight between before and after sieving is the amount of residue on the sieve per 30 g of the toner, a ratio of residue being thus obtained,
• as the ratio of the residue on the 25 μm opening sieve, an average of the measurement values is obtained by performing the above operations three times, and
• performing another elemental analysis to obtain a weight of particles other than the fatty acid metal salt particles in the residue, whereby the weight of only the fatty acid metal salt particles remaining on the sieve having an opening of 25 μm is obtained by subtracting the weight of particles other than the fatty acid metal salt particles in the residue from the weight of the residue;
• and
• B represents a weight of fatty acid metal salt particles remaining on a sieve having an opening of 45 μm when the toner is sieved with a sieve having an opening of 45 μm with respect to the total weight of the toner under the following conditions:
• an elemental analysis of a surface of the toner particles is performed by X-ray fluorescence spectroscopy to determine a weight, if any, of particles other than the fatty acid metal salt particles in the toner,
• 30.0 g of toner is added into a beaker containing 500 g of a 3.0% by weight aqueous sodium dodecylbenzene sulfonate solution while stirring, and a toner dispersion liquid is prepared using an ultrasonic cleaner,
• a Buchner funnel for φ70 mm filter paper is attached to a suction bottle, and a stainless-steel sieve having an opening of 45 μm, φ75 mm, and a height of 20 mm for a test with a tare weighted is set onto the Buchner funnel, a gap between the sieve and a side surface of the Buchner funnel is sealed, and the toner dispersion liquid is poured onto the sieve from above while air is suctioned from the suction bottle,
• subsequently, 500 g of a 1.0% by weight aqueous sodium dodecylbenzene sulfonate solution is used for rinsing an inner surface of the Buchner funnel and a mesh portion of the sieve to remove the toner adhered to the mesh portion of the sieve,
• the mesh portion of the sieve is further rinsed with a mixed solution of ion exchange water and ethanol at a weight ratio of 80:20,
• the sieve is detached from the Buchner funnel and is air-dried,
• a weight of the sieve after being dried is weighed, and a difference in the sieve weight between before and after sieving is the amount of the residue on the sieve per 30 g of the toner, a ratio of residue being thus obtained,
• as the ratio of the residue on the 45 μm opening sieve, an average of the measurement values is obtained by performing the above operations three times, and
• performing another elemental analysis to obtain a weight of particles other than the fatty acid metal salt particles in the residue, whereby the weight of only the fatty acid metal salt particles remaining on the sieve having an opening of 45 μm is obtained by subtracting the weight of particles other than the fatty acid metal salt particles in the residue from the weight of the residue.