Quinophthalone compound
US5359075A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1992 |
| Grant date | Oct 25, 1994 |
| Priority date | — |
| Expiry date | Aug 5, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B25/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A novel quinophthalone compounds and the 2(2')-ene wherein when R.sub.1 is tautomer a hydrogen atom, tautomer thereof an alkyl group having 2 to 8 carbon atoms which may be branched cycloalkyl group having 5 or 6 ring atoms, R.sub.2 is a hydrogen atom, halogen atom, alkoxy group, alkylthio group, arylthio group which may be substituted, by alkyl of 1 to 4 carbon atoms, each of R.sub.3 and R.sub.4 is a hydrogen atom, alkyl group, N-substituted aminocarbonyl group, or a heterocyclic ring substituent having two or more ring atoms of one or more kinds selected from the group consisting of a nitrogen atom, oxygen atom and sulfur atom, R.sub.3 and R.sub.4 collectively with the ring carbon atoms to which they are attached form an N-substituted maleimide ring; provided however, that when R.sub.1 is a hydrogen atom, is a hydrogen atom, and R.sub.3 is a heterocyclic ring substituent having two or more ring atoms of one or more kinds selected from the group consisting of a nitrogen atom, oxygen atom and sulfur atom are, useful for coloring of polymeric materials, liquid crystal materials and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.