Abstract 1. A PROCESS FOR PREPARING A POLYURETHANE PREPOLYMER COMPOSITION COMPRISING: EXOTHERMICALLY REACTING AN ARYLENE DIISOCYANATE WITH A POLYOXYPROPYLENE POLYOL AT AN (NCO)/(OH) EQUIVALENT WEIGHT RATIO RANGE OF SUBSTANTIALLY 1.6.1.0 TO 2.25/0.06, PROVIDING A REACTION MASS TEMPERATURE RISE NOT SUBSTANTIALLY EXCEEDING 72*C., SUBSEQUENTLY REACTING IN A SECOND STAGE A POLYOXYPROPYLENE GLYCOL IN AN AMOUNT PROVIDING AN (NCO)/(OH) EQUIVALENT WEIGHT RATIO OF SUBSTANTIALLY 2.0/1.0 IN A TEMPERATURE RANGE OF 82 TO 93*C. FOR A TIME PERIOD REQUIRED TO REACT WITH ALL FREE REMAINING ARYLENE DIISOCYANATE; SUBSEQUENTLY ADDING AN ALIPHATIC DIISOCYANATE IN AN AMOUNT TO PRIVIDE A PREPOLYMER HAVING 10 TO 60 WEIGHT PERCENT OF AFORESAID SELECTED DIISOCYANATE, PROVIDING AN ISOCYANATE TERMINATED PREPOLYMER COMPOSITION SUBSTANTIALLY FREE OF VOLATILE ARYLANE DIISOCYANATE.
A PROCESS FOR PREPARING A POLYURETHANE PREPOLYMER COMPOSITION COMPRISING: EXOTHERMICALLY REACTING AN ARYLENE DIISOCYANATE WITH A POLYOXYPROPYLENE POLYOL AT AN (NCO)/(OH) EQUIVALENT WEIGHT RATIO RANGE OF SUBSTANTIALLY 1.6.1.0 TO 2.25/0.06, PROVIDING A REACTION MASS TEMPERATURE RISE NOT SUBSTANTIALLY EXCEEDING 72*C., SUBSEQUENTLY REACTING IN A SECOND STAGE A POLYOXYPROPYLENE GLYCOL IN AN AMOUNT PROVIDING AN (NCO)/(OH) EQUIVALENT WEIGHT RATIO OF SUBSTANTIALLY 2.0/1.0 IN A TEMPERATURE RANGE OF 82 TO 93*C. FOR A TIME PERIOD REQUIRED TO REACT WITH ALL FREE REMAINING ARYLENE DIISOCYANATE; SUBSEQUENTLY ADDING AN ALIPHATIC DIISOCYANATE IN AN AMOUNT TO PRIVIDE A PREPOLYMER HAVING 10 TO 60 WEIGHT PERCENT OF AFORESAID SELECTED DIISOCYANATE, PROVIDING AN ISOCYANATE TERMINATED PREPOLYMER COMPOSITION SUBSTANTIALLY FREE OF VOLATILE ARYLANE DIISOCYANATE.
Claim 2
Dependent Claim
116 words
A PROCESS FOR PREPARING A POLYURETHANE PREPOLYMER COMPOSITION COMPRISING: EXOTHERMICALLY REACTING AN ARYLENE DIISOCYANATE WITH A POLYOXYPROPYLENE POLYOL AT AN (NCO)/(OH) EQUIVALENT WEIGHT RATIO RANGE OF SUBSTANTIALLY 1.6.1.0 TO 2.25/0.06, PROVIDING A REACTION MASS TEMPERATURE RISE NOT SUBSTANTIALLY EXCEEDING 72*C., SUBSEQUENTLY REACTING IN A SECOND STAGE A POLYOXYPROPYLENE GLYCOL IN AN AMOUNT PROVIDING AN (NCO)/(OH) EQUIVALENT WEIGHT RATIO OF SUBSTANTIALLY 2.0/1.0 IN A TEMPERATURE RANGE OF 82 TO 93*C. FOR A TIME PERIOD REQUIRED TO REACT WITH ALL FREE REMAINING ARYLENE DIISOCYANATE; SUBSEQUENTLY ADDING AN ALIPHATIC DIISOCYANATE IN AN AMOUNT TO PRIVIDE A PREPOLYMER HAVING 10 TO 60 WEIGHT PERCENT OF AFORESAID SELECTED DIISOCYANATE, PROVIDING AN ISOCYANATE TERMINATED PREPOLYMER COMPOSITION SUBSTANTIALLY FREE OF VOLATILE ARYLANE DIISOCYANATE.