abstract |
MICROPOROUS SHEET STRUCTURES ARE PREPARED BY CONVERTING AQUEOUS DISPERSIONS OF POLYURETHANE POLYMERS HAVING SALT-TYPE GROUPS INTO SHEET STRUCTURES AND MELT SINTERING THE STRUCTURES. THE DISPERSIONS ARE SEDIMENTING AND REDISPERSIBLE, THE PARICLES HAVING AN AVERAGE PARTICLE SIZE ABOVE ABOUT 5U. THE PRODUCTS OF THE INVENTION ARE USEFUL AS ARTIFICAL LEATHER IN THE PREPARATION OF RAINCOATS, HANDBAGS, BELTS, SHOES, UPHOLSTERY AND ALSO AS VIBRATION AND SOUND DAMPING MATERIALS. |