http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1071023-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5c24684033fba97d1ad845ce453a57e3 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D06L4-24 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D06L4-657 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D06L3-12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D06L3-08 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D06L4-657 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D06L4-24 |
| filingDate | 1963-11-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1967-06-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1071023-A |
| titleOfInvention | Bleaching and optically brightening cellulosic materials |
| abstract | Cellulosic fibrous materials, e.g. cellulose pulp and cotton, are bleached and optically brightened with a chlorite and an optical brightener which is a diaminostilbene-disulphonic acid derivative in a single bath process by first bleaching them at a pH value of up to 5 in an aqueous bath containing a water-soluble chlorite and then treating them in the same bath with the optical brightener after the addition of an alkaline agent. The chlorite bath which may contain 0.75-3% of chlorite based on the weight of the material to be bleached and an alkyl-phenolpolyglycol ether or alkylaryl sulphonate and have a goods-to-liquor ratio of between 1:5 and 1:30, may be adjusted to a pH of 3-5 by the addition of sulphuric, formic or acetic acid or ammonium chloride. The chloride bleaching may be carried out at a temperature of 45 DEG -100 DEG C. The alkaline agent added to the bath may be an alkali metal hydroxide, carbonate, bicarbonate, di- or tri phosphate, pyrophosphate or borate and the bath may contain 0.5% of the optical brightener based on the weight of the material to be bleached. At the end of the chlorite bleaching the bath may be adjusted to a pH of 6-8 and the optical brightener then added or the optical brightener may be added at the end of the chlorite bleaching and the pH of the bath then adjusted to 6-8. Suitable optical brighteners are those having the formula <FORM:1071023/D1-D2/1> OR <FORM:1071023/D1-D2/2> |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-113930961-A |
| priorityDate | 1962-11-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 43.