Thermoplastic polyurethanes for adhesives,coatings and moldings
Abstract
Abstract THERMOPLASTIC POLYURETHANE OF THE FORMULA -O-Y-O-((CO-NH-R-NH-COO-Z-O)M-CO-NH-R-NH-COO-Y-O)N-H WHEREIN M AND N ARE INTEGERS OF AT LEAST 1, HAVING IMPROVED THERMOPLASTICITY, IS PREPARED BY REACTIN A DIISOCYANATE OF THE FORMULA OCNRNCO WITH A HYDROXYL-TERMINATED COMPOUND OF THE FORMULA HO-Z-OH WHERE Z STANDS FOR RESIDUES SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC POLYETHER RESIDUES AND ALIPHATIC POLYESTER RESIDUES WHICH IS LIQUID AT A TEMPERATURE AT LEAST 80*C. LOWER THAN THE CRYSTAL MELTING POINT OF A POLYESTER OF THE FORMULA HO-Y-OH WHERE Y STANDS FOR POLYESTER RESIDUES CONTAINING TEREPHTHALIC ACID AND ETHYLENE GLYCOL AS THE MAIN COMPONENT AND HAVING HYDROXYL GROUPS AT BOTH ENDS TO FORM A PREPOLYMER AND REACTING SUCH PREPOLYMER WITH THE POLYESTER HAVING A CRYSTAL MELTING POINT OF 150 TO 220*C., THE REACTIONS BEING CARRIED OUT UNDER THE SPECIFIED CONDITIONS.
Inventors
- 👤 Hachiro Goto
Bibliographic Details
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