Patent ID: 7329722

Claim:
A polymeric charge transport material having the formula where n is a distribution of integers between 1 and 100,000 with an average value of greater than one; Y comprises an aromatic group; and X is a bond or a linking group, wherein the linking group comprises a —(CH 2 ) n — group, where n is an integer between 1 and 20, inclusive, and one or more of the methylene groups is optionally replaced by S, C═O, O═S═O, a heterocyclic group, an aromatic group, an NR a 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 alkyl group, an acyl group, an alkoxy group, an alkylsulfanyl group, an alkenyl group, an alkynyl group, a heterocyclic group, an aromatic group, or a part of a ring group.