OLIGOMER LIQUID CRYSTAL TRIPHENYLENE DERIVATIVES AND THEIR USE AS CHARGE CARRYING SUBSTANCES IN ELECTROPHOTOGRAPHY

摘要

Compounds have the general formula (I) Z[-Y1-(A-Y2)m-X]n, in which the variables have the following meanings: Z stands for an n-valent aliphatic residue with 2 to 20 C atoms or for an n-valent three to seven-membered saturated or unsaturated carbocyclic or heterocyclic residue that may also be benzocyclised, or for an n-valent siloxane or cyclosiloxane residue with up to 10 Si atoms; Y1, Y2 stand for a chemical bond, oxygen, sulphur or a group -CO-O-, -O-CO-, -N(R)-CO- or -CO-N(R)-; m equals 0 or 1; A stands for an alkylene group with 2 to 20 C atoms in which non-adjacent C atoms may be substituted by oxygen, sulphur, -CO-O-, -O-CO- or -N(R)-; n equals 2 to 6; R stands for hydrogen or C1-C4-alkyl; and X stands for a substituted triphenylene residue. Because they recur n times in the compounds, A, Y1, Y2, m and X may be the same or different. These compounds are useful as charge carriers.