Synthesis of Carbon Black Particles Grafted with a Reactive Polymer and their Characteristics.

Carbon black powders were grafted with a polymer by using a reactive polymer, and their characteristics were examined. First, a reactive polymer, which easily reacted with the carbon black particles, was prepared. Then, the graft reaction of the carbon black with the polymer was carried out. The polymer-grafted carbon black showed high dispersibility in both the dispersion solutions and the coated layers. The former and latter were suggested from small particle size of the carbon black and high gross value, respectively. The low viscosity of the polymer-grafted carbon black solution suggested its high stability. Spin-coated layers of the polymer-grafted carbon black had a good surface smoothness. The polymer-grafted carbon black dispersed binder layer showed smooth change in electrical resistivities with the carbon black concentration. It can be concluded that grafting carbon black particles with a reactive polymer improves their dispersibility and stability.