US 12,247,326 B2
Flexible ignition resistant non-electrically conductive biregional fibers, articles made from non-non-electrically conductive biregional fibers, and methods of manufacture
Francis P. McCullough, Angleton, TX (US)
Assigned to Mariposa Monarca, LLC, Danbury, TX (US)
Filed by Mariposa Monarca, LLC, Danbury, TX (US)
Filed on Aug. 23, 2019, as Appl. No. 16/549,644.
Claims priority of provisional application 62/722,013, filed on Aug. 23, 2018.
Prior Publication US 2022/0282405 A1, Sep. 8, 2022
Int. Cl. D01F 8/04 (2006.01); D01F 8/08 (2006.01); D01F 8/18 (2006.01); D01F 9/22 (2006.01)
CPC D01F 8/04 (2013.01) [D01F 8/08 (2013.01); D01F 8/18 (2013.01); D01F 9/225 (2013.01); D10B 2401/041 (2013.01); D10B 2401/063 (2013.01); D10B 2401/10 (2013.01); D10B 2403/02 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A non-electrically conductive biregional fiber comprising:
an inner core region of a partially oxidized thermoplastic polymeric composition; and
a surrounding outer sheath region of a thermoset carbonaceous material;
wherein said fiber is ignition resistant and has an LOI (Limiting Oxygen Index) value of greater than 50%.