Abstract: Process for preparing a permeable adhesive tape which comprises;preparing a dispersion comprising, as a dispersion medium, an organic solvent solution containing a natural or synthetic rubber and/or acrylic pressure sensitive adhesive agent and a polyfunctional isocyanate compound, and at least water and hydrophobic inorganic fine particles and optionally a water absorptive high molecular weight compound dispersed in the organic solvent solution,applying the dispersion directly onto a porous material or impregnating the porous material with the dispersion, thereafter the dispersion-applied or impregnated porous material being dried by heating; or spplying the dispersion onto a releasing sheet, heat drying the dispersion-applied sheet and laminating a porous material on the dispersion-applied surface thereof, thereby providing the permeable adhesive tape in which the permeable adhesive layer and the porous material are integrated.

Abstract: A process for preparing permeable adhesive tapes, which comprises dispersing water or water and a water absorptive high-molecular weight compound homogeneously in a solution of a natural or synthethic rubber or acrylic pressure sensitive adhesive agent in an organic solvent, applying the dispersion onto a releasing agent applied sheet, drying the adhesive agent applied sheet, and laminating a porous backing material on the adhesive agent applied surface to obtain a permeable adhesive tape.