A series of novel copolymers having components with hole transport ability and silane functionality have been synthesized. These copolymers were prepared by radical polymerization. Through a sol-gel process with methyltrimethoxysilane, solutions of the copolymers were coated to form the hole transport layer of an organic photoreceptor. These hole transport active silsesquioxane layers were coated as either a charge transport layer (CTL) on a charge generation layer (CGL) or a protective overcoat on a CTL. The electrophotographic and scratch resistant properties of the photoreceptors prepared with these sol-gel layers are described.
Xin Jin, David S. Weiss, Louis J. Sorriero, Wayne T. Ferrar, "Novel Sol-gel Materials with Charge Transporting Properties" in Journal of Imaging Science and Technology, 2003, pp 361 - 365, https://doi.org/10.2352/J.ImagingSci.Technol.2003.47.4.art00010