Production of polyurethane foams for wound management

A process for producing a wound dressing foam, comprising providing a composition comprising:

• (a) silane-terminated polyurethane prepolymers (I) obtained by reacting:
• (i) polyurethane prepolymers (A) having free isocyanate groups to an average NCO functionality of at least 1.5 with;
• (ii) di- and/or trialkoxysilanes (B) having amino, hydroxyl and/or thiol groups bonded to the silicon atom via an alkylene radical;
• or
• (iii) polyhydroxy compounds (C) having an average OH functionality of at least 1.5 with;
• (iv) di- and/or trialkoxysilanes (D) having isocyanate and/or isothiocyanate groups bonded to the silicon atom via an alkylene radical comprising more than one alkoxysilane group;
• (b) (foam) additives (II);
• (c) optionally catalysts (III);
• (d) optionally blowing agents (IV), and also
• (e) optionally further, auxiliary and adjunct materials (V);
• wherein the composition is foamed, applied to skin before, during or after foaming, and cured in the presence of water, and
• wherein said wound dressing foam has a density of less than 0.4 g/cm3 and
• wherein water is added for curing, in an amount such that the molar ratio of alkoxysilane groups in the silane-terminated prepolymer to added water is less than or equal to 1.