Toner, process cartridge, and image forming apparatus

A process cartridge that is detachably attachable to an image forming apparatus, the process cartridge comprising:

• a toner;
• and
• a toner container that accommodates the toner,
• wherein the toner comprises a toner particle containing a binder resin, an olefin unit-containing polystyrene resin B, and an ester wax A,
• wherein the olefin unit-containing polystyrene resin B is a copolymer having an olefin unit and a styrene unit,
• the ester wax A is an ester compound having a structure represented by formula (A),
• in formula (A), each R independently represents an n-alkyl group,
• the ester compound includes, as the n-alkyl group, n-heneicosyl group, n-nonadecyl group, and n-heptadecyl group,
• a content proportion of n-heneicosyl group is 50.0% by mass or greater and 80.0% by mass or less with respect to a total mass of groups which is included as the n-alkyl group,
• a content proportion of n-nonadecyl group is 5.0% by mass or greater and 15.0% by mass or less with respect to the total mass of groups which is included as the n-alkyl group, and
• a content proportion of n-heptadecyl group is 15.0% by mass or greater and 30.0% by mass or less with respect to the total mass of groups which is included as the n-alkyl group.

An image forming apparatus comprising:

• a toner;
• a toner bearing member that bears the toner;
• an electrostatic latent image bearing member;
• a charging unit configured to cause a charging member to charge a surface of the electrostatic latent image bearing member;
• an electrostatic latent image forming unit configured to form an electrostatic latent image on the charged electrostatic latent image bearing member;
• a developing unit configured to develop the electrostatic latent image using the toner to form a toner image on the electrostatic latent image bearing member;
• a transfer unit configured to transfer the toner image to a recording medium;
• and
• a fixing unit configured to fix the toner image transferred onto the recording medium to the recording medium,
• wherein the toner comprises a toner particle containing a binder resin, an olefin unit-containing polystyrene resin B, and an ester wax A,
• the olefin unit-containing polystyrene resin B is a copolymer having an olefin unit and a styrene unit,
• the ester wax A is an ester compound having a structure represented by formula (A),
• in formula (A), each R independently represents an n-alkyl group,
• the ester compound includes, as the n-alkyl group, n-heneicosyl group, n-nonadecyl group, and n-heptadecyl group,
• a content proportion of n-heneicosyl group is 50.0% by mass or greater and 80.0% by mass or less with respect to a total mass of groups which is included as the n-alkyl group,
• a content proportion of n-nonadecyl group is 5.0% by mass or greater and 15.0% by mass or less with respect to the total mass of groups which is included as the n-alkyl group, and
• a content proportion of n-heptadecyl group is 15.0% by mass or greater and 30.0% by mass or less with respect to the total mass of groups which is included as the n-alkyl group.