Breathable non-woven composite viral penetration barrier fabric and fabrication process
US5728451A · kind A · utility
Inventors
Key dates
| Filing date | Mar 26, 1997 |
| Grant date | Mar 17, 1998 |
| Priority date | — |
| Expiry date | Mar 26, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24826
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A breathable non-woven fabric having barrier capabilities to biological liquids comprised of at least one non-woven layer bonded to at least one surface of a thermoplastic microporous film, the non-woven composite fabric providing a barrier to passage: (a) of biological liquid when the composite fabric is subjected to contact with synthetic blood under the dictates of testing procedure ASTM ES21-92; and (b) to viral penetration when the composite fabric is subject to contact with .phi.X174 bacteriophage suspension at a titer of 10.sup.3 PFU/mL for 5 minutes with no applied pressure, 1 minute at 13.8 kPa (2.0 PSIG), and 54 minutes with no applied pressure while maintaining a moisture of vapor transmission rate of greater than about 450 grams per square meter for 24 hours at about 75.degree. F. and about 65% relative humidity, the non-woven composite fabric which has been thermally bonded by unwinding and contacting at least one continuous thermoplastic non-woven web to at least one side of a continuous thermoplastic microporous film, continuously transporting said contacted webs and film through a thermal bonding zone and thermally bonding the webs and film at multiple spaced-apart …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.