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Abstract

Abstract A PROCESS FOR PREPARING A CELLULAR POLYURETHANE-POLYUREA COMPOSITION HAVING A RESISTANT, STRONG MOLDING SKIN THAT REMAINS BONDED TO SAID CELLULAR COMPOSITION AND EXHIBITS NO VISIBLE POROSITY TO THE NAKED EYE, AND A FOAM DENSITY GREATER THAN 150 GRAMS PER LITER BY (A) PREPARING A REACTION MIXTURE BY MIXING A POLYISOCYANATE, A POLYOXYALKYLENE POLYOL HAVING AN AVERAGE MOLECULAR WEIGHT BETWEEN ABOUT 130 AND 6,000, AN AROMATIC POLYAMINE, A FOAMING AGENT, AND A CATALYST FOR THE POLYURETHANE-POLYUREA REACTION THE NH2/OH RATIO BEING BETWEEN 0.3 AND 5/1, THE NCO/OH+NH2 RATIO BEING BETWEEN 0.9 AND 2/1, THE AMOUNT OF FOAMING AGENT BEING FROM 0.5 TO 50 WEIGHT PERCENT OF THE WEIGHT OF THE REACTION MIXTURE, THE AMOUNT OF CATALYST BEING FROM 0 TO 2 WEIGHT PERCENT OF THE COMBINED WEIGHT OF SAID POLYOL AND SAID AROMATIC POLYAMINE, THE MIXING BEING CARRIED OUT AT A TEMPERATURE IN THE RANGE OF ABOUT 0* TO 140*C.; (B) INTRODUCING THE REACTION MIXTURE INTO A MOLD, WHICH IS AT A TEMPERATURE BETWEEN ABOUT 20* AND 150*C., WHEREIN THE REACTION AND EXPANSION TAKE PLACE; (C) AFTER COMPLETION OF THE EXPANSION, PLACING THE MOLD IN AN OVEN MAINTAINED AT A TEMPERATURE IN THE RANGE OF ABOUT 20* TO 140*C.; AND (D) AFTER A PERIOD OF FROM ABOUT 5 TO 30 MINUTES REMOVING THE MOLD FROM SAID OVEN AND DEMOLDING THE RESULTING CELLULAR COMPOSITION.

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