http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1471759-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0efa077d881a96aeb1e29b21ef1bbb58 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09B1-50 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09B1-545 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09B1-50 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09B1-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09B1-54 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C225-36 |
| filingDate | 1974-07-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1977-04-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1471759-A |
| titleOfInvention | Manufacture of anthraquinonoid disperse dyes containing bromine |
| abstract | 1471759 Preparing disperse dyes BASF AG 5 July 1974 [7 July 1973] 29878/74 Heading C4P Blue anthraquinone disperse dyes are prepared by reducing 1,5-dinitro-4,8-dimethoxy- or 1,8 - dinitro - 4,5 - dimethoxy - anthraquinone, or a mixture thereof, in oleum containing 20-45% by weight sulphur trioxide, using not less than the stoichiometric amount of sulphur in presence of boric acid at a temperature of not more than 50 C. at which temperature the reaction mixture is fluid and then brominating the product. Preferably the final product contains 12 to 30% by weight bromine. The methoxy groups are hydrolysed to hydroxy groups in situ. The starting materials may be prepared by nitrating the corresponding dimethoxyanthraquinones and the three reaction steps, nitration, reduction and bromination may be carried out in a one pot process wherein after reduction the acid strength is reduced to 96% H 2 SO 4 to 5% oleum. Alternatively, the bromination may take place in an inert organic solvent. In both methods bromination takes place at up to 135 C. optionally in presence of a halogenation catalyst. Improved dyestuffs are obtained by giving a subsequent treatment with alkaline reagents. The dyes are used in synthetic fibres, e.g. polyesters. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-102942800-A |
| priorityDate | 1973-07-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 35.