Patent ID: 9500974
Filing Date: 2016-11-22
CPC Classification: G03G

Claim Text:
1. A toner comprising a plurality of toner particles each including a core and a shell layer disposed over a surface of the core, wherein the shell layers include a resin containing a unit derived from a thermoplastic resin and a unit derived from a monomer or prepolymer of a thermosetting resin, the toner has an average roundness of no less than 0.965 and no greater than 0.975, the toner contains less than 0.5% by number of toner particles having a roundness of no greater than 0.85, the toner has a displacement rate represented by the equation “toner displacement rate=100×Z1/Z2” of no less than 0.50% and no greater than 0.70% as measured in a micro-compression test on the toner, where: Z1 is an amount of displacement of the toner particles when subjected to load at a load rate of 60 nN/s until the load reaches a maximum load of 60 nN, and then left to stand for one second at the maximum load in an environment at a temperature of 23° C. and a relative humidity of 50%; and Z2 is a particle size of the toner particles, the cores contain a polyester resin, the unit derived from a thermoplastic resin is cross-linked by the unit derived from a monomer or prepolymer of a thermosetting resin in the shell layer, and the resin included in the shell layers contains, as the unit derived from a monomer or prepolymer of a thermosetting resin, one or more units selected from the group consisting of a unit derived from a monomer or prepolymer of a melamine-based resin, a unit derived from a monomer or prepolymer of a urea-based resin, and a unit derived from a monomer or prepolymer of a glyoxal-based resin.