Diamine cured fluid polyether urethane compositions

Claim 1

A POLYURETHANE PRODUCT PREPARED BY A PROCESS COMPRISING (A) PREPARING A FLUID ISOCYANATO-TERMINATED COMPOSITION BY REACTING AT A TEMPERATURE BETWEEN ABOUT 25*C. AND 100*C., (1) AN ORGANIC DIISOYCYANATE SELECTED FROM THE GROUP CONSISTING OF TOLUENE-2,4-DIISOCYANATE AND A MIXTURE OF TOLUENE-2,4-DIISOCYANATE AND TOLUENE-2,6-DIISOCYANATE, WITH (2) ABOUT ONE MOL OF POLYALKYLENEETHER GLYCOL HAVING A MOLECULAR WEIGHT BETWEEN ABOUT 1,000 AND 2,500 AND (3) FROM ABOUT 0.5 TO 3.0 MOLS OF A GLYCOL HAVING A MOLECULAR WEIGHT BELOW ABOUT 350; THE RATIO OF THE NUMBER OF ISOCYANATE GROUPS PROVIDED BY SAID ORGANIC DIISOCYANATE TO THE SUM OF THE NUMBER OF HYDROXYL GROUPS PROVIDED BY SAID POLYALKYLENEETHER GLYCOL AND SAID GLYCOL HAVING A MOLECULAR ABOUT 350 HAVING A VALUE RANGING FROM ABOUT 1.5:1 TO 2.0:1, AND (B) REACTING, AT A TEMPERATURE BETWEEN ABOUT 25*C. TO 135*C., SAID FLUID ISOCYANATE-TERMINATED COMPOSITION WITH AN ARYLENE PRIMARY DIAMINE HAVING A PKB AT 25*C. OF AT LEAST 9.7; WITH THE PROVISO THAT THE AMOUNT OF ARYLENE PRIMARY DIAMINE BE SUFFICIENT TO REACT WITH FROM 50-100% OF THE FREE ISOCYANATO GROUPS IN SAID FLUID ISOCYANATO-TERMINATED COMPOSITION.