Hydrazone-based charge transport materials having an unsaturated acyl group

An electrophotographic imaging apparatus comprising:

• (a) a light imaging component;
• and
• (b) an organophotoreceptor oriented to receive light from the light imaging component, the organophotoreceptor comprising an electrically conductive substrate and a photoconductive element on the electrically conductive substrate, the photoconductive element comprising:
• (i) a charge transport material having the formula
• where Ar comprises an aromatic group;
• X comprises a bond or a linking group;
• and
• R1, R2, R3, R4, and R5 comprise, each independently, H, an alkyl group, an alkenyl group, an alkynyl group, an aromatic group, a heterocyclic group, or a part of a ring group;
• and
• (ii) a charge generating compound.

An electrophotographic imaging process comprising;

• (a) applying an electrical charge to a surface of an organophotoreceptor comprising an electrically conductive substrate and a photoconductive element on the electrically conductive substrate, the photoconductive element comprising
• (i) a charge transport material having the formula
• where Ar comprises an aromatic group;
• X comprises a bond or a linking group;
• and
• R1, R2, R3, R4, and R5 comprise, each independently, H, an alkyl group, an alkenyl group, an alkynyl group, an aromatic group, a heterocyclic group, or a part of a ring group;
• and
• (ii) a charge generating compound.
• (b) imagewise exposing the surface of the organophotoreceptor to radiation to dissipate charge in selected areas and thereby form a pattern of charged and uncharged areas on the surface;
• (c) contacting the surface with a toner to create a toned image;
• and
• (d) transferring the toned image to substrate.

A charge transport material having the formula

• where Ar comprises an aromatic group;
• X comprises a bond or a linking group;
• and
• R1, R2, R3, R4, and R5 comprise, each independently, H, an alkyl group, an alkenyl group, an alkynyl group, an aromatic group, a heterocyclic group, or a part of a ring group.

A method of preparing a polymeric charge transport material by the steps of:

• (i) providing a solution of a charge transport material having the following formula:
• where Ar comprises an aromatic group;
• X comprises a bond or a linking group;
• and
• R1, R2, R3, R4, and R5 comprise, each independently, H, an alkyl group, an alkenyl group, an alkynyl group, an aromatic group, a heterocyclic group, or a part of a ring group;
• and
• (ii) polymerizing the charge transport material in the presence of an initiator.

A polymeric charge transport material having the following formula:

• where n is a distribution of integers between 1 and 100,000 with an average value of greater than one;
• Ar comprises an aromatic group;
• X comprises a bond or a linking group;
• and
• R1, R2, R3, R4, and R5 comprise, each independently, H, an alkyl group, an alkenyl group, an alkynyl group, an aromatic group, a heterocyclic group, or a part of a ring group.