TONER FOR DEVELOPING ELECTROSTATIC IMAGE, APPARATUS UNIT AND IMAGE FORMING METHOD

摘要

A toner for developing an electrostatic image includes: 100 wt. parts of a binder resin, 1 - 150 wt. parts of a colorant and a relatively large amount of 5 - 40 wt. parts of a low-softening point substance. The toner is further characterized by viscoelastic properties including: a storage modulus at 60.degree.C (G'60) and a storage modulus at 80.degree.C (G'80) providing a ratio (G' 60/G' 80) of at least 80, and a storage modulus at 155.degree.C (G'155) and a storage modulus at 190 .degree.C (G'190) providing a ratio (G'155/G'190)of 0.95 - 5. As a result, the toner shows good low-temperature fixability and anti-offset characteristic, and also little temperature-dependence of gloss.