Method for the production of thermally stable polycaprolactam
Abstract
Abstract SHAPED ARTICLES SUCH AS FILAMENTS ARE PRODUCED FROM POLYCAPROAMIDE IN A CONTINUOUS PROCESS WHICH COMPRISES EXTRUDING A NASCENT MOLTEN POLYMER HAVING LESS THAN ABOUT 12 MEQ./KG. OF MINOR SPECIES OF UNREACTED END GROUPS AND LESS THAN 2.5 PERCENT BY WEIGHT WATER EXTRACTABLES FOLLOWING POLYMERIZATION. THE MOLTEN POLYMER IS KEPT SUBSTANTIALLY ANHYDROUS AND MAINTAINED UNDER SHEAR IN A FILLED SYSTEM UNTIL EXTRUDED TO FORM A PRODUCT. THIS PROCESS EFFECTIVELY INHIBITS THE REGENERATION OF MONOMER IN THE POLYMER AND STABILIZES THE MOLECULAR WEIGHT THEREOF AFTER POLYMERIZATION THEREBY IMPROVING THE QUALITY OF THE PRODUCTS PRODUCED FROM THE POLYMER MELT PREPARED IN ACCORDANCE WITH THE PRESENT INVENTION.
Inventors
- 👤 Ian C Twillery
- 👤 Guido John Coli Jr
- 👤 David W H Roth Jr
Bibliographic Details
Claims Analysis
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