Microporous film with liquid triggered barrier feature
US5955187A · kind A · utility
36Cited by
25References
59Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1997 |
| Grant date | Sep 21, 1999 |
| Priority date | — |
| Expiry date | Oct 31, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/652
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A self-regulating breathable microporous film layer transmits water vapor at normal use conditions, and reduces or eliminates the vapor transmission when the vapor in the environment becomes excessive. The film layer includes a voided polymer matrix and a plurality of fine water-swellable filler particles disposed within the voids. When there is an excess of vapor, the filler particles swell to block or partially block transmission of vapor through the voids and the film layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.