| abstract |
The invention relates to a process for obtaining poly-epsilon-caprolactam, characterized in that, for the purpose of superior utilization of the reusable materials, the mixture consists of: 10 ... 98 p polyamide polyamide material of high polymerization grade , 90 ... 2 parts of caprolactam and 1 ... 5 aqueous solution of 1 ... 10% of o-phosphoric acid is heated to 210 DEG -270 DEG C., preferably between 215 DEG and 230 DEG C., in inert atmosphere, stirring for 3 to 8 hours, after which the overpressure is evacuated, kept at the reaction temperature for an additional 1 ... 2h, the crude polymer melt is extruded in the reaction vessel in the form of a cable , in a cold demineralised water bath (about 20 degrees C), after which the cable is granulated, and the granules extracted with hot and dried water after the crude polymer processing processes known per se. |