Patent · US Expired

Flexible water and oil resistant composites

US6074738A · kind A · utility

22Cited by

16References

40Claims

0Family size

Inventors

Rainer von Fragstein · Günzburg, DE
Wolfgang Buerger · Hersbruck, DE
Rudolf Steffl · Pfronten, DE
Wolfgang Zehnder · Schramberg, DE

Key dates

Filing date	Jun 25, 1997
Grant date	Jun 13, 2000
Priority date	—
Expiry date	Jun 25, 2017

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T442/2238
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

This invention provides air impermeable liquid-water resistant water-vapor-permeable composites that are highly oleophobic and some of which have enhanced water-vapor-permeable properties. In its broadest aspect, the composites comprise: a layer of a microporous polymer that is water-vapor permeable and which is oleophobic, and which is liquid water-resistant. This layer is in contact with an air-impermeable, liquid water resistant, polymer layer that is permeable to water-vapor molecules. The oleophobic microporous polymer layer confers enhanced oleophobicity. In another aspect, a third layer of a microporous, water vapor permeable polymer can also be present on the other side of the air-impermeable polymer layer.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.