Urethane-modified polyester for toner binder

摘要

In this paper we introduce a binder design for toner to achieve better fixing and anti-offset performance. Molecular weight distribution plays the most vital role for fixing and anti-offset. A binder with a large low molecular weight portion is necessary for better fixing performance at a lower temperature, and gel is important for better anti-offset performance at higher temperature. To achieve suitable molecular weight distribution, we developed a urethane modified polyester, Mitsui's "ALMATEX~(TM) series", for toner binder. The binder is a reaction product of a mixture of two kinds of polyester resin and a diisocyanate. The toner of this resin shows an excellent balance of fixing and anti-offset quality for electrophotography.