The present invention provides an electrophotographic toner binder containing, as a main component, a polymer whose constituent monomer is a monomer having an ethylenically unsaturated bond, the electrophotographic toner binder being excellent in low-temperature fixability, hot-offset resistance, and storage stability. The present invention provides an electrophotographic toner binder containing a polymer (A) containing a monomer (a) and a monomer (x) different from the monomer (a) as essential constituent monomers, wherein the monomer (a) is a (meth)acrylate having a C18-C36 acyclic hydrocarbon group, the polymer (A) has an acid value of 40 or less, and the polymer (A) satisfies the following relational expression (1) : 1.1cal/cm30.5≤SPx−SPa≤8.0cal/cm30.5 wherein SP(a) is the SP value of a structural unit derived from the monomer (a) constituting the polymer (A); and SP(x) is the SP value of a structural unit derived from the monomer (x) different from the monomer (a) constituting the polymer (A).
本发明提供了一种电子照相调色剂粘合剂,其主要成分是一种聚合物,其组成单体是具有
乙烯不饱和键的单体,该电子照相调色剂粘合剂具有优异的低温定影性、耐热胶印性和储存稳定性。本发明提供了一种电子照相调色剂粘合剂,该粘合剂含有一种聚合物(A),该聚合物(A)含有单体(a)和与单体(a)不同的单体(x)作为基本组成单体,其中单体(a)是具有 C18-C36
无环烃基的(甲基)
丙烯酸酯,聚合物(A)的酸值为 40 或以下,聚合物(A)满足以下关系式(1): 1.1cal/cm30.5≤
SPx-
SPa≤8.0cal/cm30.5 其中,
SP(a)是由构成聚合物(A)的单体(a)衍生的结构单元的
SP 值;
SP(x)是由与构成聚合物(A)的单体(a)不同的单体(x)衍生的结构单元的
SP 值。