Cellular polyurethane composition and method of making same

Claim 1

IN THE METHOD OF MAKING A BREATHABLE, CELLULAR AND RESILIENT POLYURETHANE WHEREIN POLYURETHANE FORMING REACTANTS COMPRISING (1) A HYDROXY TERMINATED POLYOL HAVIN A MOLECULAR WEIGHT OF FROM 600 TO 5,000 AND BEING AT LEAST ONE POLYOL SELECTED FROM THE GROUP CONSISTING OF A POLYALYLENE EHTER POLYOL AND A POLYESTER COMPRISING THE REACTION PRODUCT OF A POLYCARBOXYLIC ACID AND A POLYHYDRIC ALCOHOL AND (2) AN ORGANIC POLYISOCYANATE HAVING FROM 2 TO 3 ISOCYANATO GROUPS IN WHICH THE MAJOR AMOUNT IS AN ORGANIC DIISOCYANATE, SAID POLYISOCYANATE BEING PRESENT IN A SUBSTANTIAL EXCESS OVER A 1:1 MOLAR RATIO OF SAID POLYISOCYANATE TO SAID POLYOL, ARE MIXED AND REACTED TOGETHER IN ADMIXTURE WITH (3) A BLOWING AGENT IN AN AMOUNT SUFFICIENT TO FOAM THE POLYURETHANE, THE IMPROVEMENT COMPRISING ADDITIONALLY MIXING WITH SAID POLYOL, POLYISOCYANATE AND BLOWING AGENT FROM ABOUT 0.05 TO 5 PARTS BY WEIGHT BASED ON 100 PARTS BY WEIGHT OF SAID POLYOL AND SAID POLYISOCYANATE OF A CATALYTIC MATERIAL FOR THE POLYURETHANE FORMING REACTION, SAID MATERIAL COMPRISING AN AMINE CONSISTING OF C, H, O AND N, HAVING FROM 4 TO 11 CARBON ATOMS, HAVING AN OXYGEN ATOM ON AN ACYCLIC ALIPHATIC CARBON ATOM BETA TO AN AMINO ACYCLIC NITROGEN ATOM, HAVING ONLY ACYCLIC AMINO NITROGEN ATOMS, BEING FREE OF -COOH GROUPS AND BEING SELECTED FROM THE GROUP CONSISTING OF TERTIARY ALIPHATIC AMINO ALCOHOLS AND TERTIARY ALIPHATIC-AROMATIC AMINO ALCOHOLS, AND THEREAFTER REPEATEDLY WRINGING SAID FOAM TO REMOVE FREE CATALYTIC MATERIAL AND TO BREAK CLOSED CELLS AT A TEMPERATURE OF FROM ABOUT 150 TO 300*F.