Fluoropolymer barrier material
US7521010B2 · kind B2 · utility
33Cited by
11References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2007 |
| Grant date | Apr 21, 2009 |
| Priority date | — |
| Expiry date | Nov 6, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/3154
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A novel densified fluoropolymer article is described which has a water vapor permeation of about 0.015 g-mm/m2/day or less, and preferably has a matrix tensile strength of at least 10,000 psi in two orthogonal directions. The articles are made by compressing expanded porous PTFE at pressures, temperatures and times which result in elimination of the pores, and subsequent stretching above the crystalline melt temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.