Electrospinning of PTFE
First Claim
1. A method of preparing a spinning dispersion, comprising:
- adding a fiberizing polymer to a polytetrafluoroethylene (PTFE) aqueous dispersion to form a PTFE/Polymer dispersion, wherein the PTFE/Polymer dispersion comprises at least 1% by weight of the fiberizing polymer in relation to weight of the PTFE/Polymer dispersion to no more than 10% by weight of the fiberizing polymer in relation to weight of the PTFE/Polymer dispersion, and wherein the PTFE/Polymer dispersion has a viscosity of at least 50,000 cP.
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Abstract
An improved process for forming a PTFE mat is described. The process includes providing a dispersion with PTFE, a fiberizing polymer and a solvent wherein said dispersion has a viscosity of at least 50,000 cP. An apparatus is provided which comprises a charge source and a target a distance from the charge source. A voltage source is provided which creates a first charge at the charge source and an opposing charge at the target. The dispersion is electrostatically charged by contact with the charge source. The electrostatically charged dispersion is collected on the target to form a mat precursor which is heated to remove the solvent and the fiberizing polymer thereby forming the PTFE mat.
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Citations
16 Claims
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1. A method of preparing a spinning dispersion, comprising:
- adding a fiberizing polymer to a polytetrafluoroethylene (PTFE) aqueous dispersion to form a PTFE/Polymer dispersion, wherein the PTFE/Polymer dispersion comprises at least 1% by weight of the fiberizing polymer in relation to weight of the PTFE/Polymer dispersion to no more than 10% by weight of the fiberizing polymer in relation to weight of the PTFE/Polymer dispersion, and wherein the PTFE/Polymer dispersion has a viscosity of at least 50,000 cP.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
Specification