Toner

A toner comprising polymer particles obtained by polymerizing a polymerizable monomer and an external additive attached to a surface of the polymer particles,

• wherein a volatilization amount a of an alkylthiol with a molecular weight of 110 or more and less than 150 with respect to the toner, which is quantitated at a volatilization temperature of 160° C. in the following purge & trap/gas chromatography measurement A, is 1 mass ppm or less:
• [purge & trap/gas chromatography measurement A]
• first, 0.1 g of the toner is put in a purge container;
• with flowing helium gas at 50 mL/min as carrier gas, the purge container is heated from room temperature at a rate of 10° C./min and kept at a temperature of 160° C. for 30 minutes;
• a volatile component thus produced is trapped in a trap tube at −130° C.;
• and next, with heating the trap tube from −130° C. to 280° C. at a rate of 50° C./min, in which the volatile component is trapped, the volatilization amount a of the alkylthiol with respect to the toner is quantitated by gas chromatography in the following conditions:
• [gas chromatography conditions]
• column temperature:
• Increased from 50° C. (kept for 2 minutes) to 270° C. (at 10° C./min)
• sample feeding temperature:
• 280° C.
• detection temperature:
• 280° C.
• carrier gas:
• Helium gas (flow rate:
• 1 mL/min) and
• wherein a volatilization amount b of the alkylthiol with respect to the toner, which is quantitated at a volatilization temperature of 220° C. in the following purge & trap/gas chromatography measurement B, is 30 mass ppm or more and 1,000 mass ppm or less:
• [purge & trap/gas chromatography measurement B]
• first, 0.1 g of the toner is put in a purge container:
• with flowing helium gas at 50 mL/min as carrier gas, the purge container is heated from room temperature at a rate of 10° C./min and kept at a temperature of 220° C. for 30 minutes;
• a volatile component thus produced is trapped in a trap tube at −130° C.;
• and next, with heating the trap tube from −130° C. to 280° C. at a rate of 50° C./min, in which the volatile component is trapped, the volatilization amount b of the alkylthiol with respect to the toner is quantitated by gas chromatography in the following conditions:
• [gas chromatography conditions]
• column temperature:
• Increased from 50° C. (kept for 2 minutes) to 270° C. (at 10° C./min)
• sample feeding temperature:
• 280° C.
• detection temperature:
• 280° C.
• carrier gas:
• Helium gas (flow rate:
• 1 mL/min).