http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-931677-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_6f3fcc7c82642b193e1477eb8827aff6 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D01F6-68 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G69-10 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D01F6-60 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D01F6-76 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D01F6-68 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G69-10 |
| filingDate | 1961-04-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_2eca7e819ce38970684a50ff5668791e |
| publicationDate | 1963-07-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-931677-A |
| titleOfInvention | Improvements in and relating to the production of artificial threads |
| abstract | The process according to Claims 8 to 23 of the parent Specification (wherein an optically gamma-methyl glutamate N-carboxy anhydride is polymerized in an organic solvent for the polypeptide formed and the solution is extruded into a setting medium so that the polypeptide is in the alpha configuration on extrusion, and the resultant fibre is stretched to convert the polypeptide into the beta configuration) is modified in that the polymerization step is carried out at an elevated temperature using a concentration of gamma-methyl glutamate N-carboxy anhydride in the solvent such that the resulting polypeptide solution contains at least 14% by weight of the polypeptide and the anhydride and all the polypeptide formed dissolve in the solvent and remain in solution therein. The polymerization may be carried out at the boiling point of the solvent if it is a single compound or an azeotropic mixture of two or more compounds, or at the boiling point of the lowest boiling constituent if the mixture is non-azeotropic. When solvents containing a major proportion of methylene chloride are used in the polymerization step, the latter may be carried out at or near the boiling point (40 DEG C.) of methylene chloride, for example under refluxing conditions. The preferred solvents are mixtures of methylene chloride and ethyl acetate. In an example, a solution of 24,5 parts by weight of gamma-methyl-L-glutamate N-carboxy anhydride in 100 parts by weight of a mixture of 12 volumes of methylene chloride and 5 volumes of ethyl acetate are heated under a reflux condenser to 40 DEG C. and 0,16 part of tri-n-butylamine added as a polymerization catalyst. The resultant solution contains about 15% by weight of the polymer and is concentrated to 16% polymer content by exposure to a vacuum. The solution is wet spun into acetone, washed with water and stretched 83% while still wet. |
| priorityDate | 1958-04-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 27.