Photosensitive composition containing vanadyl phthalocyanine for photoelectrophoretic imaging systems
US4032339A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1976 |
| Grant date | Jun 28, 1977 |
| Priority date | — |
| Expiry date | May 24, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G17/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photosensitive composition for use in photoelectrophoretic imaging system. The particulate component of this composition includes vanadyl phthalocyanine pigment particles which have been treated with a polymer having structural units of the formula ##STR1## WHEREIN Z is a pendant group of the formula ##STR2## X is a substituent substantially incapable of withdrawing electrons from the electron rich pyridinyl moiety; PA1 M is a whole number from 0 to 3; and PA1 N is a whole number in excess of 25. The intimate association of at least some of the polymer with at least some of the vanadyl phthalocyanine pigment is believed to effectively attenuate photoinjection of holes from the phthalocyanine pigment into the surrounding materials thereby both reducing the D.sub.min of the phthalocyanine pigment; and, to improve color separation of reproductions prepared by processes employing a subtractive color system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.