| abstract |
PROCESS FOR PREPARING A POROUS SHEET MATERIAL WHICH INCLUDES IMPREGNATION AND OR DEPOSIT ON A SUBSTRATE OF A WATER-TYPE POLYURETHANE EMULSION IN OIL D COMPRISING A HYDROPHOBIC POLYURETHANE A, A HYDROPHOBIC POLYURETHANE A, A HYDROPHOBIC POLYURETHANE AND A HYDROPHOBIC POLYURETHANE AND ORGANIC SOLVENT C WATER, AND ITS DRYING, CHARACTERIZED IN THAT HYDROPHOBIC POLYURETHANE A IS A DISPERSION OF HYDROPHOBIC POLYURETHANE E OBTAINED BY REACTION OF A HYDROPHOBIC POLYOL, AN ORGANIC DIISOCYANATE AND A CHAIN EXTENSION IN AN ORGANIC SOLVANT C HAS LIMITED COMPATIBILITY WITH WATER AND IN WHICH THE POLYURETHANE IN THIS FORM IS PRACTICALLY INSOLUBLE; HYDROPHILIC POLYURETHANE B IS A POLYURETHANE CONTAINING ABOUT 20 TO ABOUT 40 BY WEIGHT, BASED ON THE TOTAL AMOUNT OF POLYMER, OF POLYOXYETHYLENE GROUPS; AND THE WEIGHT RATIO OF A: B IS ABOUT 90-99: ABOUT 10-1. BASE MATERIAL FOR FAUX LEATHER. |