BLACK TONER AND TONER KIT FOR FULL COLOR IMAGE FORMATION

摘要

PROBLEM TO BE SOLVED: To provide a black toner for attaining the high solid black image quality of a small variation in brightness even if it shows stable development characteristic regardless of a use condition, exhibits high image glossiness, and has a favorable low-temperature fixing characteristic. SOLUTION: When the maximal value of a loss elastic modulus G" measured by a dynamic viscoelasticity test of the toner is from 50°C to 62°C, a temperature (P1) showing the minimal value of a loss tangent tanδ is from 120°C to 155°C, the value tanδ(P1) of the minimal value is from 0.50 to 5.00, the value G'(P1) of a storage elastic modulus at P1 is from 7.0×102to 1.0×104Pa, the value of a storage elastic modulus at P1-20°C is set as G'(P1-20), and the value of a storage elastic modulus at P1+20°C is set as G'(P1+20), a relation of äLogG'(P1-20)-LogG'(P1)}<äLogG'(P1)-LogG'(P1+20)} is established. COPYRIGHT: (C)2010,JPO&INPIT