| abstract |
A method of producing polyurethane foam filter material containing an activated carbon adsorbent which comprises reacting a polyurethane foam-forming composition comprising isocyanates and polyesters or polyethers in the presence of particles of an activated carbon adsorbent, a small amount of water and a catalyst, characterized in that the particles of the activated carbon adsorbent are pre-coated on their surfaces with a filmforming polymeric material which does not substantially react with the polyurethane foam-producing components, does not dissolve the polyurethane foam and can be removed, after formation of the polyurethane foam, by application of solvent. The filter material obtained finds a wide range of utility such as for water cleansing, ion-exchanging, deodorizing or drying purposes. |