Toner resin with improved rub-off properties

This invention relates to toner resins that are synthesized by emulsion polymerization which exhibit good electrical charge stability, adhesion to paper, and rub-off characteristics. The toner resins of this invention are comprised of repeat units that are derived from a vinyl aromatic monomer, an alkyl acrylate monomer, and acrylonitrile. These resins are void of repeat units that are derived from acrylic acid. The toner resins of this invention also have a number average molecular weight of greater than 12,000, a weight average molecular weight of greater than 36,000, and a glass transition temperature which is within the range of about 45{C to about 80{C. The toner resins of this invention are typically made by emulsion polymerization utilizing diacid cycloaliphatic emulsifiers to attain improved adhesion to paper, improved electrical charge stability, a high level of resistance to moisture, and resistance to moisture adsorption (adsorbed moisture is known to neutralize electrical charges).