Electrically photosensitive particles for electrophoretic migration imaging processes, dispersions of these particles, and processes using such dispersions.

摘要

Electrically photosensitive particles very suitable for use in electrophoretic migration imaging processes comprise a colorant, which may or may not itself be electrically photosensitive, dispersed in a binder polymer; this polymer comprising units containing one or more of the structures (i) triarylamine, (ii) p-aminotetraarylmethane, (iii) 4,4'-bis(p-amino)-triarylmethane, (iv) 1,1-bis(p-aminoaryl)isobutane, (v) 1,1-bis(p-aminoaryl)cyclohexane, (vi) N-alkyl-N, N-diarylamine (vii) N-alkenyl-N, N-diarylamine, (Viii) N, N-dialkyl-N-arylamine, and (ix) heterocyclic containing at least one nitrogen atom and from 3 to 12 carbon atoms in the ring structure which may include at least one fused ring. The particles are used for imaging as a dispersion in an electrically insulating carrier.