Disazo pigments containing naphthalene coupling components
US4046755A · kind A · utility
2Cited by
2References
1Claims
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Assignee
Inventors
Key dates
| Filing date | Aug 14, 1975 |
| Grant date | Sep 6, 1977 |
| Priority date | — |
| Expiry date | Aug 14, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B33/147
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disazo pigments of the formula ##STR1## wherein R.sub.1 is 2-nitro-5-chlorophenyl or 1-nitronaphthyl-2, R.sub.2 is naphthalene in which the azo, hydroxyl and --CO--group are in the 1,2,3-position and R.sub.4 is a phenylene or naphthalene group are prepared. The disazo pigments may be used for pigmenting high molecular organic materials such as cellulose ethers, polyamides, polyurethanes and acrylic. The pigments have very good fastness to migration, heat and to light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.