Infra-red sensitive photographic materials
US5216166A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1991 |
| Grant date | Jun 1, 1993 |
| Priority date | — |
| Expiry date | Jun 19, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B23/0066
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Cyanine dyes are disclosed having a nucleus of the formula: ##STR1## wherein; A and B are independently selected from the group consisting of heterocyclic ring nuclei and heterocyclic fused ring nuclei so as to complete a cyanine dye, PA0 m and n independently have values of 0, 1, 2 or 3 with the proviso that 2.ltoreq.m+n.ltoreq.4, PA0 R is selected from the group consisting of hydrogen, alkyl groups and aryl groups, each of which groups may be substituted, and PA0 Q represents those non-metallic atoms necessary to complete a nucleus selected from the group consisting of heterocyclic ring nuclei, carbocyclic ring nuclei, heterocyclic fused ring nuclei and carbocyclic fused ring nuclei. The cyanine dyes of formula (I) may be used to spectrally sensitise silver halide grains to radiation in the wavelength range from 650 nm upwards, especially 700 to 850 nm, to provide infrared-sensitive, silver halide photographic materials which are particularly suitable for use with electronically modulated exposure sources, such as lasers and light emitting diodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.