Patent ID: 11421086

Abstract:
The present invention relates to a process for producing a fluoropolymer article having a high surface roughness and high coarseness which comprises the following steps:      The present invention further relates to a fluoropolymer article obtainable by a process according to the invention.The present invention furthermore relates to a fiber comprising, or consisting of, a fluoropolymer having a surface roughness expressed as a peak to valley distance (Rt) greater than 10 micrometer and/or an average surface roughness (Ra) greater than 1.5 micrometer.The present invention furthermore relates to a membrane comprising, or consisting of, a fluoropolymer having a coarseness index ρ/EBP of at least 0.3, an air permeability of 15 ft3/ft2/min or higher and a node aspect ratio of below 25.