Mixed carbonate ester derivatives of quinophthalone dyes and their preparation
US5243052A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1990 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Jun 29, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B68/46
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A mixed carbonate ester of a quinophthalone dye and a tertiary alkanol containing not more than about 9 carbon atoms, preferably a compound of the formula: ##STR1## wherein X is a sulfur atom or a carbonyl group; each Y independently is a hydrogen atom, a halogen atom, a --CO--OR.sup.4 or a --CO--NHR.sup.4 group, wherein R.sup.4 is an alkyl group containing not more than about 10 carbon atoms; R is a hydrogen atom or an --O--C(.dbd.O)--O--CR.sup.5 R.sup.6 R.sup.7 group; and R.sup.1, R.sup.2, R.sup.3, R.sup.5, R.sup.6 and R.sup.7 are each an alkyl group, subject to the proviso that R.sup.1, R.sup.2 and R.sup.3 together contain a total of not more than about 8 carbon atoms, and R.sup.5, R.sup.6 and R.sup.7 together contain a total of not more than about 8 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.