http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-831081-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/D01F2-10 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D01F2-08 |
| filingDate | 1956-07-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1960-03-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-831081-A |
| titleOfInvention | Improvements in or relating to the production of regenerated cellulose from viscose |
| abstract | Regenerated cellulose filaments are made by extruding viscose prepared by xanthating alkali cellulose with at least 37% of carbon disulphide, based on the cellulose content of the alkali cellulose, into an aqueous coagulating bath containing sodium sulphate, up to 10% of sulphuric acid, at least 5% of zinc sulphate and less than 0.2% of a primary, secondary or tertiary aliphatic or cycloaliphatic monoamine having at least 4 carbon atoms but containing no radical of more than 8 carbon atoms, the amine being soluble in an aqueous sulphuric acid bath containing at least 5% of zinc sulphate and 9.5% of sulphuric acid to an extent of at least 0.15%. The percentage of carbon disulphide used for xanthation is at least 4.6 times the percentage of sulphuric acid in the bath. Preferred amines are di- and tri-ethylamine, butyl monoethanolamine, cyclohexylamine and N-methylcyclohexylamine. Other amines which may be used are dipropylamine, butylamine, dibutylamine, diethanolamine, ethyldiethanolamine, methyldiethanolamine, triethanolamine, dipropanolamine, propylpropanolamine, hexanolamine, amyldiethanolamine, butylmethylethanolamine, tetramethyleneimine, piperidine, hexyldiethanolamine and ortho-methyl-N-methylcyclohexylamine. The concentration of amine in the coagulating bath may be as low as 0.05% and is preferably 0.05 to 0.15%. The salt index of the viscose is preferably 10 or higher and its temperature is preferably 40 DEG C. or higher. The spinning bath is preferably maintained at 40-80 DEG C. and preferably contains 4-10% of sulphuric acid, 5-25% of sodium sulphate and 5-15% of zinc sulphate. The sulphates of other divalent metals may also be present. In an example, viscose prepared by xanthating alkali cellulose with 42% of carbon disulphide, based on the cellulose content of the alkali cellulose, ripened to a salt index of about 16, and containing 6.25% of cellulose and 5.75% of total alkali, calculated as sodium hydroxide, is spun at about 45 DEG C. into a bath at about 63 DEG C. containing 7.4% of sulphuric acid, 17.5% of sodium sulphate, 9.5% of zinc sulphate and 0.15% of diethylamine. Regenerated cellulose filaments produced as described above have low gel swelling values, no appreciable crenulation and skin-to-core ratios (when measured radially) greater than one. Specifications 533,309, 652,471, 652,746, 654,083, 712,623, 741,727 and U.S.A. Specification 2,536,014 are referred to. |
| priorityDate | 1955-07-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 55.