Breathable films and method for making
US6444302B1 · kind B1 · utility
34Cited by
61References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 1, 2000 |
| Grant date | Sep 3, 2002 |
| Priority date | — |
| Expiry date | Oct 27, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31938
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a cold-drawn breathable film formed from a blend of a soft polymer component and a hard polymer component. The soft polymer component (SPC) is a copolymer of a major olefinic monomer and a minor olefinic monomer. The major olefinic monomer is either ethylene or propylene and forms the majority of the SPC. Preferred films after cold-drawing exhibit a water vapor transmission rate (WVTR) of at least 100 g-mil/m2-day.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.