Microporous multilayer nonwoven material for medical applications

US4618524A · kind A · utility

Assignee

• Firma Carl Freudenberg · DE

Inventors

• Dieter Groitzsch · Hirschberg, DE
• Erich Fahrbach · Weinheim, DE

Key dates

• Filing date: Sep 17, 1985
• Grant date: Oct 21, 1986
• Expiry date: Sep 17, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/24826
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A microporous, multilayer material has a layer of microfibers having a weight of from about 0.5 to about 60 g/m.sup.2, the microfibers having diameters of from about 0.1 to about 10 microns. The microfiber layer is covered on opposite sides with nonwoven layers and all the layers are bonded together with a pattern of water repellent and, preferably, elastic paste members sufficiently penetrating through the layers. A process for making the microporous, multilayer material imprints the paste for the penetration-bonding paste members on one or both sides of the layers only squeezed dry after washing and water-repellentizing baths.