Process for manufacture of porous sheet material and a porous sheet having a textile substrate

Abstract

Abstract A PROCESS FOR THE MANUFACTURE OF A POROUS SHEET MATERIAL WHICH COMPRISES THE STEPS OF APPLYING A LIQUID HOMOGENEOUS MIXTURE OF A POLYMER, E.G., A POLYURETHANE, AND AN AUXILIARY SUBSTANCE, E.G., CAPROLACTAM, TO A SUBSTRATE, COOLING THE MIXTURE TO A TEMPERATURE AT WHICH THERE IS FORMED A SOLID PHASE SUBSTANTIALLY COMPRISING THE POLYMER, THE AUXILIARY SUBSTANCE COMPRISING A SOLVENT FOR THE POLYMER WHICH UPON COOLING OF THE MIXTURE PRECIPITATES FROM THE MIXTURE INTO A SEPARATE SOLID PHASE BEFORE THE FORMATION OF THE SOLID POLYMER PHASE IS COMPLETED, AND THEREAFTER REMOVING THE AUXILIARY SUBSTANCE TO FORM A HOMOGENEOUS UNIFORM POROUS SHEET MATERIAL.

Inventors

• 👤 Cornelis A Smolders
• 👤 Joseph T V M Geusgens

Bibliographic Details