Breathable non-woven composite barrier fabric and fabrication process
US5409761A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 2, 1993 |
| Grant date | Apr 25, 1995 |
| Priority date | — |
| Expiry date | Jul 2, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/678
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A breathable non-woven composite 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 of biological liquid when the composite fabric is subjected to contact with synthetic blood under the dictates of testing procedure ASTM ES 21 92 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 having a breaking strength of at least about 14 pounds. A process is provided for forming 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 locations, said bonding having a dwell time sufficient to thermally bond said composite while avoiding bum-through degradation of the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.