Method for producing an adhesive-free wound contact composite material

US11730853B2 · kind B2 · utility

Assignee

• Covestro Intellectual Property GmbH & Co. KG · DE

Inventors

• Marc-Stephan Weiser · Leverkusen, DE
• Sascha Plug · Leverkusen, DE
• Sebastian Dörr · Mülheim an der Ruhr, DE

Key dates

• Filing date: Feb 13, 2018
• Grant date: Aug 22, 2023
• Expiry date: May 13, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2475/04
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The invention relates to a process for producing a composite material for wound dressings, comprising the following steps: (I) providing a first film, having a first film surface and a second film surface running virtually parallel to the first film surface: (II) mixing an NCO-terminated polyurethane prepolymer with at least water to give a polyurethane prepolymer/water mixture, (III) applying the polyurethane prepolymer/water mixture to at least one part of the first film surface to form a layer, the layer having a first layer surface which is in contact with the first film via at least one part of the first film surface, and having a second layer surface which runs virtually parallel to the first layer surface; (IV) covering at least one part of the second layer surface with a further film, wherein the bond strength between the first film and the layer and also between the layer and the further film is greater in each case than the tensile strain at break of the layer. The invention further relates to a composite material produced by the process of the invention and also to a wound dressing comprising such a composite material and also to the use thereof in a wound dressing for i…