http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-697056-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/C09B29-366 |
| filingDate | 1951-07-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1953-09-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-697056-A |
| titleOfInvention | Manufacture of new monoazo-dyestuffs |
| abstract | 1 - Alkyl - 3 - methyl - 5 - pyrazolones where the 1-alkyl group contains 4 or more carbon atoms are made by reacting the appropriate alkyl-hydrazine with acetoacetic amide or ester. Examples show the preparation of the 1-n-octyl and 1-n-dodecyl compounds. Other specified radicals are n-butyl, isobutyl, n-amyl, n-hexyl, 2-ethylhexyl, n-decyl, cetyl and octadecyl. The 1-alkyl-hydrazines are made as in Specification 695,513.ALSO:The invention comprises 1-alkyl-3-methyl-4-arylazo-5-pyrazolones in which the alkyl residue has at least 4 carbon atoms and the aryl group is a benzene or naphthalene residue, and their preparation from the appropriate diazo compounds and 1 - alkyl - 3 - methyl - 5 - pyrazolones. When the diazo components are free from solubilizing groups the resulting dyestuffs are suitable for colouring hydrophobic materials such as fats, waxes, oils and resins and for dyeing or printing cellulose acetate and superpolyamides and superpolyurethanes; preferably the 1-alkyl group in the pyrazolone residue has 4-8 carbon atoms. Dyestuffs made from diazo components containing sulphonic or carboxylic acid groups may be used for dyeing or printing wool, leather, silk and nylon. Metachrome or after-chrome dyes for wool are obtained from diazo compounds having an o-metallizable group (hydroxyl, alkoxyl or carboxyl) and a sulphonamide or methylsulphone group as the sole solubilizing group. Similar chromable dyes for wool are produced from sulphonated diazo components having an o-metallizable group, the 1-alkyl group in the pyrazolone residue preferably having 4-12 (e.g. 8) carbon atoms. In examples the following dyestuffs are prepared: (1) sulphanilic acid --> 1 - n - dodecyl - 3 - methyl - 5 - pyrazolone; (2) 4 - nitro - 2 - aminophenol - 6 - sulphonic acid --> 1 - n - butyl - 3 - methyl - 5 - pyrazolone; (3) 2 - aminophenol - 5 - sulphonamide --> 1 - n - butyl - 3 - methyl - 5 - pyrazolone; and (4) 3 - nitro - p - toluidine --> 1 - n - butyl - 3 - methyl - 5 - pyrazolone. In further examples (5) wool is dyed yellow with the product of (1) from an acid bath; (6) wool is dyed yellowish red with the dyestuff 4-chloro-2-aminophenol-5-sulphonic acid --> 1 - n - octyl - 3 - methyl - 5 - pyrazolone by the metachrome process; (7) similar to (6) using the dyestuff from 1-n-butyl-3 - methyl - 5 - pyrazolone; (8) cellulose acetate yarn is dyed in a bath made up from the product of (4) pasted with sulphite cellulose waste liquor. A table is given of other dyestuffs that may be prepared and further suitable diazo components are mentioned. |
| priorityDate | 1950-07-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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