http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-423521-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1e70c0aeade92d7571d955d3b90ea06e |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09B35-40 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09B35-40 |
| filingDate | 1933-08-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1935-02-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-423521-A |
| titleOfInvention | Azo dyestuffs and their manufacture |
| abstract | Polyazo dyes are made by coupling a dihydroxybenzene or a nuclear derivative thereof with one molecular proportion of p-nitro-or p-acylaminodiazobenzene and one molecular proportion of another nitro- or acylamino-diazo compound, or with two molecular proportions of a nitro- or acylamino-diazo compound other than p-nitro- or p-acylamino-diazobenzene, converting the nitro and/or acylamino groups into amino groups, and finally tetrazotizing and coupling with a coupling component (2 mols.). They dye leather in level brown shades. In examples: (1) the dyestuff picramic acid \sQ resorcinol is reduced with calcium hydrosulphide, tetrazotized and coupled with m-phenylenediamine-4-sulphonic acid; (2) the dyestuff p-nitraniline-o-sulphonic acid --> resorcinol \sM picramic acid is reduced and coupled as above. Other end components specified are 1-p-sulphophenyl-3-methyl-5-pyrazolone, R salt, H acid, a - and b -naphthol, 2-naphthol-6-, 8-, 5- or 7-sulphonic acid, 2-naphthol-3 : 7-, 4 : 8- or 6 : 8- disulphonic acids, 1- or 2-naphthol-3 : 6 : 8-trisulphonic acid, 1-naphthol-2-, 4- and 5-sulphonic acid, 1 : 6- or 1 : 7-Cleves' acid, naphthionic acid, 1-phenyl-3-methyl - 5 - pyrazolone, 1 - (4 - chlor - 3 - sulpho - phenyl) - 3 - methyl - 5 - pyrazolone, acetoacetic - anilide or o-chloranilide, a -methylindole, a -or b -naphthylamine, 1 : 5 : 7-, 2 : 8 : 6-, 1 : 8 : 4-, 1 : 8 : 6-, 2 : 3 : 6-, 2 : 5 : 7, and 2 : 7 : 3-aminonaphtholsulphonic acids, b -hydroxynaphthoic acid, J - acid urea, p - aminobenzoyl - J - acid, phenyl-J acid and salicylic acid. Other middle components specified are b -resorcylic acid, 2 : 4-dihydroxybenzene - 1 - sulphonic acid, 1 : 3-dihydroxy-4-chlorbenzene, orcinol, catechol and dihydroxynitro-, bromo- or fluorobenzenes. First and end components of the benzene, naphthalene, anthracene, diphenyl, phenylnaphthyl, dinaphthyl and carbazole series may in general be used and these may carry halogen, alkyl, alkoxy, hydroxy, nitro, amide, carboxy, sulpho, aryloxy and alkaryl groups. The Specification as open to inspection under Sect. 91 comprises also the use of two equivalents of any diazotized monoacyldiamino or nitroamino derivative of an aromatic compound as first component and gives an example of the preparation of the dyestuff acetylamino-1 : 4 : 7-Cleves' acid --> resorcinol (hydrolysed) (2 mols.) \sQ resorcinol (1 mol.). Dihydroxy anisidines and phenetidines are also specified as middle components. This subject-matter does not appear in the Specification as accepted. |
| priorityDate | 1932-08-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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Total number of triples: 56.