Toner for electrostatic charge development

摘要

To provide a toner, which contains a binder resin, a colorant, and a releasing agent, wherein the binder resin contains a low molecular weight resin component, where the low molecular weight resin component has a resin softening coefficient (A), represented by the following formula (1), satisfying A>0.165, and has storage elastic modulus (dyne/cm2) G′(Tfb) satisfying G′(Tfb)≦1×104 where Tfb is a flow onset temperature (° C.) of the low molecular weight resin component as measured by a capillary rheometer:
A=|[(r1)−ln G′(r2)]/(T1−T2)|  Formula (1)
(where T1 is temperature (° C.) at which storage elastic modulus G′(r1) is 1×105 (dyne/cm2) and T2 is temperature (° C.) at which storage elastic modulus G′(r2) is 1×103 (dyne/cm2) as measured by means of a viscoelasticity measuring device with measuring frequency of 1 Hz, and measuring distortion of 1 deg; and | | represents an absolute value.).

主权项

1. A toner, comprising:
a binder resin; a colorant; and a releasing agent, wherein: the binder resin comprises a low molecular weight resin component having a resin softening coefficient (A), represented by formula (1);
A=|[lnG′(r1)−lnG′(r2)]/(T1−T2)|  (1),and has storage elastic modulus (dyne/cm2) G′(Tfb) satisfying G′(Tfb)≦1×104 where Tfb is a flow onset temperature (° C.) of the low molecular weight resin component as measured by a capillary rheometer;
A>0.165; T1 is temperature (° C.) at which storage elastic modulus G′(r1) is 1×105 (dyne/cm2); T2 is temperature (° C.) at which storage elastic modulus G′(r2) is 1×103 (dyne/cm2) as measured by a viscoelasticity measuring device with measuring frequency of 1 Hz, and measuring distortion of 1 deg; and ∥ represents an absolute value.