Electrophotographic organophotoreceptors with novel charge transport compounds
View Patent ↗Charge transport compounds are described that have a multiple number of hydrazone-bridged (N,N-disubstituted)arylamine groups connected by a central bridging group. Examples of charge transport compounds of this invention are those having the following generic formula: (R-Q) n -Y where R is an (N,N-disubstituted)arylamine group; Q comprises an aliphatic or aromatic hydrazone linking group; n is 2; and Y comprises a bridging group comprising an aryl group having the formula —Ar 1 -G-Ar 2 — where Ar 1 and Ar 2 are, each independently, an arylene group and G comprises a bond, O, S, —SO 2 —, an imine group, an alkylene group, or an aromatic group.
1. A charge transport compound having the following formula:
(R-Q) n -Y
where R is triarylamine group, diaryl alkylamine group or dialkyl arylamine group;
Q comprises an aliphatic or aromatic hydrazone linking group wherein the hydrazone linking group has the formula:
where Z is an alkyl group or an aryl group; and X is —(CH 2 ) m — where m is an integer between 0 and 20;
n is 2; and
Y has the formula:
where A 1 , A 2 , A 3 , A 4 , A 5 , A 6 , A 7 , and A 8 comprise, each independently, H, an aryl group, a heterocyclic group, a hydroxyl group, a thiol group, a cyano group, a nitro 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 part of a ring group, such as cycloalkyl groups, heterocyclic groups, and a benzo 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.
2. The charge transport compound of claim 1 wherein m is 0.
3. The charge transport compound of claim 1 wherein the triarylamine group has the formula:
where R 10 , R 11 , and R 12 are, each independently, H, an alkyl group, or aryl group.