Microporous composite sheet material
US8328968B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 2012 |
| Grant date | Dec 11, 2012 |
| Priority date | — |
| Expiry date | Apr 16, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/681
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Disclosed herein are methods of preparing a composite sheet material having strength and barrier properties suitable for use as a housewrap, the methods comprising extrusion coating a polyolefin film layer onto a surface of an area-bonded, spunbond nonwoven substrate to form a composite sheet material, the composite sheet material having a grab tensile strength of at least 178 Newtons in at least one of the machine direction (MD) or the cross-machine direction (CD), and stretching the composite sheet material to impart to the composite sheet material a hydrostatic head of at least 100 cm, and a moisture vapor transmission rate (MVTR) of at least 35 g/m2/24 hr at 50% relative humidity and 23° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.