Patent ID: 11971684
Assignee: ZEON CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A toner comprising
colored resin particles containing a binder resin, a colorant, a softening agent and a charge control agent, and
an external additive,
wherein the binder resin contains a polymer of polymerizable monomers containing at least a monovinyl monomer,
a weight average molecular weight of the polymer is 30000 or more and 80000 or less,
wherein the softening agent is an ester wax, and a content of the softening agent is 12 parts by mass or more and 15 parts by mass or less, with respect to 100 parts by mass of the monovinyl monomer,
wherein a content of the charge control agent is 1.7 parts by mass or more and 15 parts by mass or less, with respect to 100 parts by mass of the monovinyl monomer, and
wherein a glass transition temperature (Tg) specified from a temperature dependence curve of a loss tangent (tan δ) obtained by dynamic viscoelastic measurement of the toner, is 50° C. or more and less than 90° C.; the loss tangent (tan δ) at the glass transition temperature (Tg) is 1.70 or less; in a temperature range of 90° C. or more and 160° C. or less, a lowest temperature (Ta) with a loss tangent of 1.50 is more than 95° C. and less than 145° C.; and a storage elastic modulus (G′) at the lowest temperature (Ta) is 38000 Pa or less.