| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an electrophotographic toner binder with which toner by which fixing lower limit temperature is made lower than heretofore, whose hot offsetting-resistant property is excellent by which the deterioration of storage stability due to the lowering of molecular weight, the occurrence of welding at a running time and the deterioration of an image quality due to a change in an electrified quantity are eliminated. SOLUTION: This electrophotographic toner binder consists of two kinds of styrenated polymer (A) and (B) having a different SP value, and the styrenated polymer (A) respectively has peak molecular weight in the range of 3000-30000 and in the range of 100000-1000000 in the molecular weight distribution figure of GPC, and the styrenated polymer (B) has peak molecular weight in the range of 3000-150000, and the SP value Tg of the styrenated polymer (A) and the styrenated polymer (B) has relations: the absolute value of SPa-SPb is 0.18-1.00 and the value of Tga-Tgb is +5 deg.C-+25 deg.C.</p> |
