| abstract |
Method of preparation an antibacterial and hydrophilic polyurethane foam structure comprising the steps of a) providing an aqueous phase containing a surfactant; b) provide an isocyanate terminated polyether having a functionality of more than 2; c) mixing said aqueous phase and said isocyanate terminated polyether, immediately transferring the resulting mixture to a mold, whereby a foam structure is obtained; and d) drying said foam structure until it has a moisture content, at most, of 10% (by weight), preferably, at most, 8% (by weight), and, even more preferably, at most, of 5 % (in weigh); characterized in that the aqueous phase in step a) also contains a silver salt selected from the group of silver sulfate, silver citrate, silver acetate, silver carbonate, silver lactate and silver phosphate, or a mixture of these salts , and because one part of said silver salt is dissolved in said aqueous phase and the other part of said silver salt is dispersed in said aqueous phase. |