申请人:Sanyo Chemical Industries, Ltd.
公开号:EP3798731A1
公开(公告)日:2021-03-31
An object of the present invention is to provide a toner binder that maintains low-temperature fixability and hot offset resistance while having excellent grindability, image strength, heat-resistant storage stability, electrostatic charge stability, gloss-imparting properties, and durability. The toner binder of the present invention contains an amorphous resin (A) and a crystalline vinyl resin (B), wherein a weight ratio [(A)/(B)] of the amorphous resin (A) to the crystalline vinyl resin (B) is 81/19 to 97/3, the toner binder has an endothermic peak top temperature (Tm) derived from the crystalline vinyl resin (B) of 40°C to 100°C and a half-width of the endothermic peak derived from the crystalline vinyl resin (B) of 6°C or less, the crystalline vinyl resin (B) has an acid value of 60 mg KOH/g or less, and the toner binder satisfies the following relatio (1):3°C≤TfbA−TfbC≤30°C.
本发明的目的是提供一种墨粉粘合剂,它既能保持低温固定性和耐热胶印性,又具有优异的研磨性、图像强度、耐热储存稳定性、静电荷稳定性、光泽诱导性和耐久性。本发明的墨粉粘合剂包含无定形树脂(A)和结晶乙烯基树脂(B),其中无定形树脂(A)和结晶乙烯基树脂(B)的重量比[(A)/(B)]为 81/19 至 97/3、调色剂粘合剂的结晶乙烯基树脂(B)的内热峰顶温度(Tm)为 40°C 至 100°C,结晶乙烯基树脂(B)的内热峰的半宽度为 6°C 或以下,结晶乙烯基树脂(B)的酸值为 60 mg KOH/g 或以下,调色剂粘合剂满足以下关系式(1):3°C≤TfbA-TfbC≤30°C。