Breathable barrier
US4758239A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1986 |
| Grant date | Jul 19, 1988 |
| Priority date | — |
| Expiry date | Oct 31, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/676
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A breathable barrier which includes: PA0 A. a first layer which is a porous sheet having a first side and a second side; and PA0 B. a second layer joined to the first side of the first layer, which second layer is a continuous film of a water-soluble polymeric material, in which: PA1 the film is not microporous in that it is substantially free of voids which connect the two surfaces of the film; PA1 water molecules are capable of being transported through the thickness of the film as a result of the solubility of the water molecules in the polymeric material; and PA1 the film has an average thickness of from about 3 to about 250 microns; wherein the first layer side of the second layer is intimately comingled with at least some of the fibers at the surface of the first side of the first layer, none of the pores at the surface of the first side of the first layer are so large as to significantly adversely affect the barrier properties of the breathable barrier as a consequence of the comingling, and the breathable barrier has a water vapor transmission rate at 37 degrees C. and about 50 percent relative humidity of from about 100 to about 5,000 g/m.sup.2 /24 hours and is impermeable…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.