Azo pigments, process for their production and their use
US4340430A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1980 |
| Grant date | Jul 20, 1982 |
| Priority date | — |
| Expiry date | Aug 4, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B29/3669
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to valuable novel azo pigments of the formula ##STR1## wherein A is a benzene residue, X is a SO.sub.3 or CO.sub.2 group, Y is a substituent that does not confer solubility in water, M is a monovalent or bivalent metal atom, and n is 1 or 2. Examples of substituents that do not confer solubility in water are: halogen, e.g. chlorine or bromine, methyl, C.sub.1 -C.sub.4 alkoxy, cyano, alkanoylamino containing 1 to 4 carbon atoms, and especially nitro and trifluoromethyl. In addition to containing the specified substituents, the benzene residue A can contain further substituents, e.g. chlorine atoms or methyl groups. Suitable metals are monovalent metals such as alkali metals, e.g. Na, K or Li, but preferably bivalent metals such as Mg, Ca, Sr, Ba, Mn, Co, Ni, Cu or Zn. However, M can also comprises mixtures of such metals. The novel pigments produce in plastics materials yellow to red colorations of excellent fastness to light, migration and atmospheric influences and also excellent heat resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.