Air permeable waterproof bicomponent film
US8048516B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2008 |
| Grant date | Nov 1, 2011 |
| Priority date | — |
| Expiry date | Jul 26, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249992
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A waterproof, vapor-permeable and gas-permeable sheet material and a method of making are provided. The sheet material includes a waterproof microporous layer and a thermoplastic layer attached to the microporous layer. The thermoplastic layer is vapor-permeable and air-permeable. The microporous layer is at least partially integrated with the thermoplastic layer to form a zone 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 microporous layer to permit passage of water droplets. The Zone can be considered to be resistant to chemical interference with at least the waterproof property of the microporous layer and inhibits detachment of the layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.