wax dispersion and domain size can be effectively controlled by incorporating a small amount of a hybrid resin binder and or a wax compatibilizer in the toner formulation . such toners show smaller wax domain size and improved fusing offset window , fusegrade and filming resistance , and therefore improved print quality and reliability . the hybrid resin contains a polyester unit via condensation reaction and a vinyl - based polymer unit via radical polymerization . the hybrid resin is highly compatible with the polyester resin binder , and at same time , can well accommodate low molecular weight polyolefin waxes in the vinyl polymer entity enabling a desirable smaller wax domain size . the wax compatibilizer is a thermoplastic styrenic block copolymer .