Patent ID: 7344811

Claim:
A polymeric charge transport material having the formula where n and m are each a distribution of integers between 1 and 50,000 with an average value of greater than one, and the n units of R 1 —Si—X 1 —Ar 1 and m units of R 2 —Si—X 2 —Ar 2 —X 3 —Z form a random copolymer, an alternative copolymer, or a block copolymer comprising at least two different blocks, each of which having the same repeating silanyl units; R 1 and R 2 comprise, each independently, an alkyl group, an alkoxy group, an alkenyl group, an alkynyl group, a heterocyclic group, an aromatic group, or a combination thereof; X 1 , X 2 , and X 3 comprise, each independently, a bond or a linking group, wherein X 1 , X 2 , and X 3 comprise, each independently, a bond or a —(CH 2 ) m — group, where m is an integer between 1 and 20, inclusive, and one or more of the methylene groups is optionally replaced by O, S, N, C, B, Si, P, C═O, O═S═O, a heterocyclic group, an aromatic group, a CR b group, a CR c R d group, a SiR e R f group, a BR g group, or a P(═O)R h group, where R a , R b , R c , R d , R e , R f , R g , and R h are, each independently, a bond, H, a hydroxyl group, a thiol group, a carboxyl group, an amino group, a halogen, an acyl group, an alkoxy group, an alkylsulfanyl group, an alkenyl group, an alkynyl group, a heterocyclic group, an aromatic group, a part of a ring group, or an alkyl group where one or more of the hydrogens of the alkyl group is optionally replaced by an aromatic group, a hydroxyl group, a thiol group, a carboxyl group, an amino group, or a halogen; A 1 and A 2 are each a terminal group; Ar 1 and Ar 2 comprise, each independently, an aromatic group; and Z comprises a hydrazone group, an azine group, a fluorenyl group, a fluorenylidene group, an aromatic heterocyclic group, an acyl group, a carboxyl group, a thiol group, a reactive ring group, an alkenyl group, an acrylate group, a methacrylate group, or a combination thereof.