Electrochromic compositions based on diketopyrrolopyrroles
US5169953A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1991 |
| Grant date | Dec 8, 1992 |
| Priority date | — |
| Expiry date | Jul 16, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K9/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Compositions containing PA0 (a) at least one 1,4-diketopyrrolo[3,4-c]pyrrole of the formula I, II, IIa, III or IV ##STR1## and (b) an auxiliary redox system from the ferrocyanide, ferrocene or ammonium iron (II) sulfate series in combination with at least one conductive salt (c), where, in the formula I, PA1 R and R.sub.2 are, for example, --H and R.sub.1 is --SO.sub.3 Na, PA1 in the formulae II and IIa, R and R.sub.3 are, for example, --H, R.sub.1 is --SO.sub.3 H and p is 3, PA1 in the formula III, R.sub.4 and R.sub.5 are, for example, phenyl and R.sub.6 and R.sub.7 are, for example, methyl, and PA1 in the formula IV R.sub.8 and R.sub.9 are, for example, phenyl, are suitable as electrochromic materials in display systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.