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US 12,503,561 B2Granted
Microparticles from thermomechanically degraded PTFE
AssigneeZeus Co., Ltd.
InventorsRobert L. Ballard, Patrick Cooper, Douglas Lee Tourville
Life of this patent
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Abstract
The present disclosure provides poly(tetrafluoroethylene) (PTFE) microparticles with a Dv50 of about 20 μm to about 30 μm and a specific surface area (SSA) of at least about 3.0 m2/g when measured by a multipoint BET method of ISO 9277. Such PTFE microparticles can be obtained via a method including thermomechanically degrading scrap PTFE in the presence of air and/or oxygen and reducing the particle size of the resultant degraded PTFE.
Claims23
Microparticles comprising reprocessed poly(tetrafluoroethylene) (PTFE),
- 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.
A method for providing microparticles comprising PTFE, comprising:
- providing reprocessed PTFE;
- degrading the reprocessed PTFE thermally and mechanically in the presence of air and/or oxygen to give degraded PTFE;
- and
- reducing the particle size of the degraded PTFE by grinding or milling to give the microparticles,
- 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 method does not comprise irradiation.
3 more elements
Dependencies are inferred from the claim text.