a method of manufacturing solvent - soluble charge transporting materials capable of imparting charge - tranporting properties to polysiloxane resins . these materials have the formula a - r 1 sir 2 3 - n q n ! p where a is a tertiary amine and organic group derived from a compound having charge transporting properties with an ionization potential of 4 . 5 - 6 . 2 ev ; r 1 is an alkylene group of 1 - 18 carbon atoms ; r 2 is a monovalent hydrocarbon group or a monovalent halogen - substituted hydrocarbon group of 1 - 15 carbon atoms ; q is a hydrolyzable group such as -- or 3 where r 3 is an alkyl group of 1 - 6 carbon atoms ; n and p are each 1 - 3 . this silicon - type charge transporting material is characterized by aromatic groups , and alkoxysilyl groups bonded via hydrocarbon groups onto the aromatic rings .