| 主权项 |
1. A toner comprising a toner particle containing a binder resin, wherein
the binder resin comprises a block polymer as a main component, the a block polymer being obtained by chemically bonding a crystalline polyester resin with an amorphous polyurethane resin, wherein; the binder resin
comprises from 50.0 mass % to 85.0 mass % of a crystalline polyester resin component, andhas a concentration of ester bonds derived from the crystalline polyester resin component of not more than 5.2 mmol/g, and wherein; in a three-point bending test on a toner specimen obtained by melting the toner and molding the same to a length (1) of 30.0 mm, a width (w) of 13.0 mm and a thickness (t) of 4.0 mm, the test being carried out at a span (L) between specimen support points of 15.0 mm, when the maximum bending stress of the toner specimen determined by formula (1) below from the maximum load FMAX(N) measured at a temperature of 25° C. is σMAX(MPa)
σMAX=(3×FMAX×L)/(2×w×t2) (1)and when the maximum value of the flexural elasticity modulus E of the toner specimen determined by formula (2) below from the slope ΔF/Δs of a load/deflection curve is EMAX(MPa)
E=L3/(4×w×t3)×(ΔF/Δs) (2),EMAX is from 200 MPa to 450 MPa, and
the strain energy u per unit volume calculated by formula (3) below from σMAX and EMAX is at least 0.30 MPa
u=σMAX2/(2×EMAX) (3)(where ΔF(N) representing a change in load between any two points selected so that the change in deflection Δs becomes 0.2 mm). |
