| abstract |
A toner for developing an electrostatic image is constituted by a binder resin and a colorant. The toner is characterized by a percentage change G' of at most 50% as calculated by the following formula (1): gamma G'=(1-G'50%/G'1%)x100(1),wherein gamma G' denotes a percentage change of storage modulus, G'50% denotes a storage modulus at 50% strain at 150 DEG C., and G'1% denotes a storage modulus at 1% strain at 150 DEG C.; a percentage change gamma G'' of at most 50% as calculated by the following formula (2): gamma G''=(1-G''50%/G''1%)x100(2),wherein gamma G'' denotes a percentage change of loss modulus, G''50% denotes a loss modulus at 50% strain, and G''1% denotes a loss modulus at 1% strain; and a storage modulus G' of 3x103-7x104 dyn/cm2 in a range of 1-50% strain at 150 DEG C. The toner is characterized by applicability to a wide variety of image forming apparatus, especially those having remarkably different fixing speeds. |