Breathable and liquid impermeable web and method of making the web
US8158846B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2008 |
| Grant date | Apr 17, 2012 |
| Priority date | — |
| Expiry date | Sep 24, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/674
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method is disclosed for modifying the physical characteristics of a web which involves passing the web between at least one pair of interengaged rolls to incrementally stretch the web, and then withdrawing the incrementally stretched web from between the rolls under tension. A web modified according to the disclosed method has desirable breathability and liquid impermeability, as well as extensibility and a soft, cloth-like textured surface. One embodiment of the present invention provides a breathable web comprising a microporous film exhibiting an MVTR of at least about 2000 g/m2/24 hr, a dynamic impact value of less than about 10 g/m2, a bubble pressure at least about 45 psi, and an air flow of at least about 2 liters/m2/s.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.