Conversion of scrap polyurethane foam to polyol
Abstract
Abstract A PROCESS IS DISCLOSED FOR COVERING SCAP POLYURETHANE INTO A POLYOL WHICH IS RE-USABLE WITHOUT THE NEED FOR PURIFICATION IN THE PREPARATION OF POLYURETHANE FOAM. THE PROCESS COMPRISES HEATING THE SCRAP AT ABOUT 175*C. TO ABOUT 250*C. (PREFERABLY AT 185 TO 225*C.) IN THE PRESENCE OF A DIHYDROXY COMPOUND CONSISTING OF (I) FROM 100 PERCENT TO 90 PERCENT BY WEIGHT OF AN ALIPHATIC DIOL HAVING FROM 2 TO 6 CARBON ATOMS, INCLUSIVE, AND HAVING A BOILING POINT ABOVE ABOUT 180*C. AND (II) FROM 0 PERCENT TO 10 PERCENT BY WEIGHT OF A DIALKANOLAMINE HAVING FROM 4 TO 8 CARBON ATOMS, INCLUSIVE. THE PROCESS IS PARTICULARLY ADVANTAGEOUS IN THE RECOVERY OF USEFUL POLYOLS FROM SCRAP RIGID POLYURETHANE FOAMS DERIVED FROM A POLYMETHYLENE POLYPHENYL POLYISOCYANATE AND A POLYOL OBTAINED BY REACTION OF PROPYLENE OXIDE WITH A MIXTURE OF POLYMETHYLENE POLYPHENYL POLYAMINES PRODUCED BY ACID CONDENSATION OF ANILINE AND FORMALDEHYDE.
Inventors
- 👤 A Sayigh
- 👤 F Frulla
- 👤 A Odinak
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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