http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1021972-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_cd8f87c2e2155f28c291bf199765144f |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D01F6-54 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D01F6-18 |
| filingDate | 1964-08-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1966-03-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1021972-A |
| titleOfInvention | Method of producing filaments of acrylonitrile polymers |
| abstract | 1,021,972. Semi-melt spinning polyacrylonitrile filaments. JAPAN EXLAN CO. Ltd. Aug. 4, 1964 [July 24, 1963], No. 30891/64. Heading B5B. A mixture of 30-60% by weight of a polymer containing a major proportion of acrylonitrile and 70-40% by weight of an aqueous solution containing more than 35% of an inorganic salt base on the weight of the solution, which solution is a solvent for the polymer at the spinning temperature is heated to obtain a melt which has a viscosity sufficiently low to render the melt spinnable, the melt is extruded through a spinning nozzle under pressure and at the melting temperature into an inert atmosphere to form continuous filaments, the filaments are drawn and solidified while they pass through the inert atmosphere such as air, the solidified filaments are washed to remove the inorganic salt, and then stretched at a temperature higher than the second order transition temperature of the polymer. The polymer may be an acrylonitrile homopolymer or a copolymer of acrylonitrile with preferably not more than 15% by weight of another monomer such as vinylpyridine, methacrylonitrile, vinyl chloride, vinyl acetate or styrene. The salt may be a chloride, bromide, iodide, thiocyanate, nitrate or perchlorate. Zinc chloride or an alkali metal thiocyanate are preferred. The heating of the mixture of polymer and salt solution to reduce its consistency sufficiently to render it spinnable is preferably effected under sufficient pressure to prevent vaporization of the water in the mixture. The filament may be jet stretched between the spinning nozzle and the collecting means at a velocity at least twice to five times the jet velocity used in the extrusion. The thermal stretching of the filaments after the removal of the salt therefrom may be effected at a draw ratio of 2 to 10 while they are passed through hot water, steam or heated air at a temperature of preferably 80‹ to 200‹ C. After this stretching step the filaments may be relaxed in water at 90‹ to 100‹ C., steam at 100‹ to 130‹ C. or air at 100‹ to 200‹ C. |
| priorityDate | 1963-07-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 38.