	US 11,939,435 B2
	Microparticles from thermomechanically degraded PTFE
Robert L. Ballard, Lexington, SC (US); Patrick Cooper, Orangeburg, SC (US); and Douglas Lee Tourville, Orangeburg, SC (US)
Assigned to ZEUS COMPANY INC., Orangeburg, SC (US)
Filed by Zeus Industrial Products, Inc., Orangeburg, SC (US)
Filed on May 25, 2021, as Appl. No. 17/329,346.
Claims priority of provisional application 63/030,634, filed on May 27, 2020.
Claims priority of provisional application 63/029,851, filed on May 26, 2020.
Prior Publication US 2021/0371602 A1, Dec. 2, 2021
Int. Cl. C08J 3/12 (2006.01); C08J 11/06 (2006.01); C08L 27/18 (2006.01)

CPC C08J 3/12 (2013.01) [C08J 11/06 (2013.01); C08L 27/18 (2013.01)]

22 Claims

1. Microparticles comprising poly(tetrafluoroethylene),

wherein the microparticles exhibit a Dv50 of about 20 μm to about 30 μm and an improved specific surface area (SSA) for particles of that size range of at least about 3.0 m²/g when measured by a multipoint BET method of ISO 9277; and

wherein the microparticles are prepared via thermomechanically degrading scrap PTFE in the presence of air and/or oxygen and reducing particle size of the degraded PTFE.