Patent ID: 11156932

Abstract:
The present invention relates to a toner binder containing: a polyester resin (A); and a vinyl resin (B), wherein the polyester resin (A) has an acid value of 2 mg KOH/g or more, the vinyl resin (B) has a weight average molecular weight of 4,000 to 40,000, the vinyl resin (B) is a polymer essentially containing a monomer (m) whose homopolymer has an SP value of 11.5 to 16.5 as a constituent monomer, the weight percentage of the monomer (m) in monomers constituting the vinyl resin (B) is 1 wt % or more based on the total weight of the monomers constituting the vinyl resin (B), the polyester resin (A) and the vinyl resin (B) are present at a weight ratio (A)/(B) of 80/20 to 99.5/0.5, and when the vinyl resin (B) contains polyethylene units (C11) having a degree of polymerization of 70 to 210 and/or polypropylene units (C12) having a degree of polymerization of 70 to 210, the total weight percentage of the polyethylene units (C11) and the polypropylene units (C12) in the vinyl resin (B) is 9 wt % or less based on the weight of the vinyl resin (B).