http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-693757-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_dc2f7134efa50484bb359fda73782848 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09B45-14 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09B45-14 |
| filingDate | 1950-05-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1953-07-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-693757-A |
| titleOfInvention | Manufacture of an intermediate product and of azo dyestuffs derived therefrom |
| abstract | The invention comprises g -(4-hydroxy-1-naphthyl)-butyric acid, which can be prepared by (1) reacting a -naphthol with a derivative of succinic acid, e.g. anhydride or chloride, or (2) dealkylating an alkyl ether thereof (especially methyl or ethyl) with aqueous alkali hydroxide at 100 DEG C. or higher, e.g. 130-160 DEG C. The alkyl ethers are made by condensing ethers of a -naphthol with succinic anhydride in the presence of aluminium chloride. In the examples: (1) a -naphthol is heated with succinic anhydride and aluminium chloride in tetrachlorethane; (2) g -(4-methoxy-1-naphthyl)-butyric acid is heated to 140-145 DEG C. with aqueous sodium hydroxide. The product is a coupling component for azo dyes (see Group IV (c)).ALSO:Azo dyes are made by coupling a diazotized o - hydroxyamine with g - (4 - hydroxy - 1-naphthyl)-butyric acid, followed if desired by metallization in substance, in the dyebath or on the fibre. The diazo components may contain a benzene, naphthalene, anthraquinone or heterocyclic nucleus. The metal-free dyestuffs are suitable for dyeing and printing fibres of wool, silk, casein, superpolyamides and animalized cellulose. Those not containing sulphonic acid groups may be applied to wool by the metachrome process, or the wool dyeings may be after-treated with agents providing copper, chromium or cobalt. Difficultly soluble copper, chromium and cobalt compounds produced in substance may be used as pigments. In the examples, dyestuffs are made from the following diazo components: 5-nitro-2-aminophenol, 5 - nitro - 3 - aminosalicylic acid, 6 - nitro - 2-aminophenol - 4 - sulphonic acid, 2 - aminophenol - 4 - sulphonamide and 2 - aminophenol-4 : 6-disulphonic acid (coppered). In further examples: (1) wool is dyed blue by the metachrome process using the dyestuff from 5-nitro-4-chloro-2-aminophenol; (2) wool is dyed red by using the dyestuff from 2-aminophenol - 4 - sulphonamide and coppering in the dyebath; (3) wool is dyed violet-brown by the metachrome process with the dyestuff from 5-nitro - 2 - aminophenol. 4 - Nitro - 2 - aminophenol is also specified as a diazo component. |
| priorityDate | 1949-05-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 49.