Method for producing shaped polyurethane foam wound dressings

Details Method for producing shaped polyurethane foam wound dressings Method for producing shaped polyurethane foam wound dressings

C - Chemistry, Metallurgy

08

J

C08J 9/38 (2006.01) A61L 15/26 (2006.01) A61L 15/42 (2006.01)

Patent

CA 2735199

The invention relates to a process for producing shaped articles, where a foam layer which includes a polyurethane foam obtained by foaming a composition including an aqueous, anionically hydrophilicized polyurethane dispersion (I), and drying, is thermoformed where the thermoforming takes place at a temperature of from >= 100°C to <= 200°C and under a pressure of from >= 50 bar to <= 150 bar, and where additionally during the thermoforming the foam is compressed to >= 25% to <= 100% of its original volume. The foam can be stabilized using ethylene oxide/propylene oxide block copolymers. The invention further relates to shape articles obtainable in this way, and to the use thereof, preferably as wound dressings.

L'invention concerne un procédé de production d'articles moulés, selon lequel une couche de mousse contenant de la mousse de polyuréthane est moulée, cette mousse de polyuréthane étant obtenue par expansion et séchage d'une composition comprenant une dispersion de polyuréthane (I) aqueuse, hydrophile anionique, le moulage étant réalisé à une température de = 100 °C à = 200°C et sous une pression de = 50 bars à = 150 bars, et le volume initial de la mousse étant comprimé de = 25% à =100% pendant le moulage. La mousse peut être stabilisée par des copolymères séquencés d'oxyde d'éthylène/de propylène. L'invention porte également sur des articles moulés selon ce procédé et sur leur utilisation, notamment comme pansements.

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