Ionic polyesters for electrically photosensitive composite particles, materials, elements and photoelectrophotoretic imaging methods

A photoelectrophoretic image recording method comprising the steps of:

• (a) subjecting an imaging element comprising a layer of an electrically photosensitive material to an electrical field;
• and
• (b) exposing said element to an image pattern of electromagnetic radiation to which said layer is photosensitive to form a record of the image pattern of electromagnetic radiation in said layer;
• wherein, said layer contains composite electrically photosensitive particles comprising a colorant and an ionic polyester comprising, as an integral part of the polymer backbone, repeating units from diol derived and diacid derived components, of which:
• a diacid derived component contains a moiety selected from the group consisting of an alkali metal or ammonium sulfoarylene, -sulfoaryloxyarylene, -sulfocycloalkylene, -iminodisulfonylarylene, -iminobis(sulfonylarylene) and sulfoaralkylarylene, and
• a diol or diacid derived component contains a moiety selected from the group consisting of bis(N-alkyl-N-alkyleneaminoaryl)arylalkane;
• bis(N-alkyl-N-alkyleneaminoaryl)diarylalkane;
• bis(N-alkyl-N-alkyleneaminoaryl)isoalkane;
• bis(N-alkyl-N-alkyleneaminoaryl)cycloalkane;
• dialkyleneaminotetraarylalkane;
• bis(alkylenearyl)arylamine and alkylenetriarylamine.