http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-512618-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_28fd8a2f7ca983e63d38bcf83d182d44 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09B35-02 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09B35-02 |
| filingDate | 1938-03-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1939-09-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-512618-A |
| titleOfInvention | Process for the preparation of disazo dyestuffs |
| abstract | 512,618. Dyes. CHEMICAL WORKS, FORMERLY. SANDOZ. March 7, 1938, No. 7107. Convention date, March 8, 1937. [Class 2 (iii)] Dyes for wool or hair are made by coupling one mol. of the tetrazo compound of 4.4<1>- diamino-diphenyl-3.3<1>-disulphonic acid or of 2.7-diamino-diphenylene-sulphonedisulphonic acid in an acid medium with two mols. of the same or different 2-amino-8-naphthol-6-sulphonic acids of the formula in which R is H, alkyl or an'aryl radicle substituted by alkyl radicles in at least the two vicinal positions, whereby the azo groups enter in o-position to the amino groups. The coupling components may be used in the form of their O-arylsulphonyl derivatives, the arylsulphonic radicles being subsequently split off. R may be vic-xylyl or mesidyl, and the coupling may be carried out in acid solution in presence of sodium formate, sodium acetate, chalk, magnesium carbonate, sulpho-cyanides, xanthogenates or thiosulphates. In examples, (1) benzidine-3.3<1>-disulphonic acid sodium salt is tetrazotised and coupled with 2-amino-8- hydroxynaphtholene-6-sulphonic acid, or its 0-toluene-sulphonyl derivative' followed by saponification (violet shades on wool or hair), or with 2-mesidylamino-8-hydroxynaphthalene- 6-sulphonic acid (blue shades) ; (2) 2.7 diaminodiphenylenesulphone-disulphonic acid is tetrazotised and coupled with 2-amino-8-hydroxygraph-thalene-6-sulphonic acid (blue shades). The O-toluene-sulphonyl derivative of 2 amino-8-hydroxy-naphthalene-6-sulphonic acid is obtained by treating an alkaline solution of 2 - acetylamino - 8 - hydroxy - naphthalene - 6- sulphonic acid with p-toluene-sulphonyl chloride, followed by boiling the product with dilute mineral acid. Specification 13743/96, [Class 2], is referred to. |
| priorityDate | 1937-03-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 26.