| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide black toners which are excellent in blocking resistance, preservable property under a high-temperature environment, low-temperature fixability, high-temperature offset resistance, developing stability, acid environment stability and transferability and make high-fineness and high-grade images obtainable. SOLUTION: The black toners containing at least a binder resin, wax and carbon black are formed by allowing the peak of a loss elastic modulus G" to exist within a temperature range of 50 to 70 deg.C, maintaining T1 within a temperature range from 85 to 105 deg.C and specifyingΔT=T2-T1>=20 deg.C when a temperature at which a storage elastic modules G' indicates 1×10<6> (dN/m<2> ) is defined as T1 and a temperature at which a storage elastic modulus G' exhibits 1×10<5> (dN/m<2> ) is defined as T2, incorporating carbon black at 0.5 to 10 mass% per 100 mass pts. binder resin and specifying the average primary grain size of the carbon black subjected to length measurement by sectional TEM observation of the toners to 14 to 60 nm.</p> |
