Process for the preparation of weavable crosslinked and carbon filledpolyolefin filaments

Abstract

Abstract WEAVABLE, CROSSLINKED POLYOLEFIN FILAMENTS CONTAINING THEREIN ADEQUATE AMOUNTS OF CARBON BLACK TO DISSIPATE ELECTROSTATIC CHARGES ARE PREPARED BY (1) EXTRUDING SUBSTANTIALLY UNCROSSLINKED COMPOSITIONS COMPRISING FROM ABOUT 20 TO 80 PERCENT BY WEIGHT OF ELECTRICALLY CONDUCTIVE CARBON BLACK AND SMALL AMOUNTS OF AN ORGANIC PEROXIDE TO FORM SUBSTANTIALLY UNCROSSLINKED FILAMENTS; (2) COOLING THE RESULTING SUBSTANTIALLY UNCROSSLINKED FILAMENTS TO A TEMPERATURE BELOW THE MELTING POINT OF THE POLYOLEFIN; (3) SUPPORTING THE COOLED FILAMENTS; AND THEREAFTER (4) PASSING THE COOLED SUBSTANTIALLY UNCROSSLINKED FILAMENTS THROUGH A FIELD OF MICROWAVES, WHILE SAID FILAMENTS ARE UN- SUPPORTED THEREIN, FOR AN INTERVAL DURING WHICH THE TEMPERATURE OF SAID FILAMENTS IS RAISED TO AT LEAST THE DECOMPOSITION TEMPERATURE OF THE PEROXIDE AND TO AT LEAST THE MELTING POINT OF THE POLYOLEFIN AND FOR A PERIOD SUFFICIENT TO SUBSTANTIALLY CROSSLINK THE COMPOSITIONS AND IMPART WEAVABILITY THERETO. WEAVABLE, STATIC-DISSIPATING, CROSSLINKED AND CARBON FILLED POLYOLEFIN FILAMENTS ARE OBTAINED HAVING A TENACITY OF AT LEAST 0.3 GRAMS PER DENIER AND AN ELONGATION OF AT LEAST 10 PERCENT AT BREAK.

Inventors

• 👤 W Meyers
• 👤 M Hawkins

Bibliographic Details