Breathable, chemical resistant, durable, and waterproof coated porous membrane
US8334227B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 2009 |
| Grant date | Dec 18, 2012 |
| Priority date | — |
| Expiry date | Jan 7, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/674
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A waterproof, vapor-permeable and air-permeable sheet material. The sheet material includes a waterproof microporous polymer substrate and a microporous thermoplastic coating layer attached to the polymer substrate. The thermoplastic coating layer is vapor-permeable and air-permeable. The thermoplastic coating layer is at least partially interpenetrated into pores of the polymer substrate forming an interface that prevents passage of water droplets, while permitting passage of water vapor and air, when a chemical is present on the sheet material that would otherwise cause the polymer substrate to permit passage of water droplets. The interface is resistant to chemical interference with at least the waterproof property of the sheet material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.