Porous fibrous fluorocarbon structures

Details Porous fibrous fluorocarbon structures Porous fibrous fluorocarbon structures

D - Textiles, Paper

04

H

183/109, 9/60, 4

D04H 1/64 (2006.01) B01D 39/16 (2006.01) D21H 15/10 (2006.01)

Patent

CA 1291587

Abstract: Porous, fibrous structures comprising polytetra- fluoroethylene fibers in a fluorocarbon binder are prepared by laying down a stabilized dispersion of the fibers, stabilizing agent, and liquid carrier on a support, removing at least a portion of a liquid carrier, preferably drying the laydown, applying an emulsion of a fluorocarbon binder to the laydown and curing the fluorocarbon binder. The resulting struc- tures have void volumes of from 40 to 99 percent, strengths of from 80 to 2,400 grams per centimeter (200 to 6,000 grams per inch) of width, and air pres- sure drops of from 0.064 to 2.5 kilograms per square meter (0.0025 to 0.1 inch of water) at a flow rate of 8.5 cubic meters per minute per square meter (28 cubic feet per minute per square foot) of the fibrous structure at standard conditions.

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