Patent · US Active

Fluoropolymer articles having a high surface roughness and high coarseness

US10377866B2 · kind B2 · utility

0Cited by

9References

8Claims

0Family size

Assignee

W.L. Gore & Associates GmbH · DE

Inventors

Michael Wendlandt · Ottobrunn, DE
Wolfgang Burger · Burgrain, DE
John W. Dolan · Boothwyn, US

Key dates

Filing date	Oct 11, 2013
Grant date	Aug 13, 2019
Priority date	—
Expiry date	Jun 24, 2035

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2978
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Fluoropolymer articles having a high surface roughness and high coarseness are provided. In one embodiment, a fiber is provided that has a surface roughness expressed as a peak-to-valley distance (Rt) greater than 10 micrometers and an average surface roughness (Ra) greater than 1.5 micrometers. In another embodiment, a membrane having a coarseness index ρ/EBP of at least 0.3 g/cm3/psi and an air permeability of 15 ft3/ft2/min or higher is provided. The fluoropolymer articles are produced by a process that includes forming a paste-formed fluoropolymer product at a temperature lower than 50° C., densifying the paste-formed product, and then stretching the dens Pied paste-formed fluoropolymer product in at least one direction. In exemplary embodiments, the fluoropolymer may be polytetrafluoroethylene (PTFE), a modified PTFE, a TFE copolymer, a fluorothermoplastic, a fluoroelastomer, or combinations thereof.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.