Polyurethanes from two distinct polyurethane polymers

Claim 1

A MEETHOD FOR PRODUCING STABLE THERMOPLASTIC POLYURETHANE POLYMERS WHICH COMPRISES COMBINING AND MELTING A FIRST SOLID POLYMER AND A SECOND SOLID POLYMER TOGETHER IN A RATIO SUCH THAT THE CALCUATED NCO/OH IS FROM ABOUT 0.96. TO ABOUT 1.010 AND SUCH THAT THE MELT VISCOSITY DOES NOT INCREASE SUBSTANTIALLY WITHIN 20 MINUTES AT A TEMPERATURE AT WHICH THE COMBINED POLYMERS FORM A CONTINUOUS EXTRUDED STRAND AT A TEMPERATURE OF FROM ABOUT 230 TO ABOUT 400*F., SAID FIRST POLYMER HAVING BEEN PREPARED BY REACTING A SUBSTANTIALLY LINEAR DIFUNCTIONAL HYDROXYL TTERMINATED POLYMER HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 600 AND A DIFUNCTIONAL CHAIN-EXTENDING AGENT CONTANING ACTIVE HYDROGEN ATOMS WHICH ARE REACTIVE WITH NCO GROUPS AND HAVING A MOLECULAR WEIGHT LESS THAN ABOUT 300 WITH AN ORGANIC DIISOCYANATE, SAID FIRST POLYMER HAVING BEEN PREPARED AT A CALCULATED NCO/OH OF FROM ABOUT 0.900 TO ABOUT 0.995, SAID SECOND SOLID POLYMER HAVING BEEN PREPARED BY REACTING A SUBSTANTIALLY LINEAR DIFUNCTION HYDROXYL TERMINATED POLYMER HAVING A MOLECULAR WEIGHT OF AT LESAT ABOUT 600 AND A DIFUNCTIONAL CHAINEXTENDING AGENT CONTAINING ACTIVE HYDROGEN ATOMS WHICH ARE REACTIVE WITH NCO GROUPS AND HAVING A MOLECULAR WEIGHT LESS THAN ABOUT 300 WITH A ORGANIC DIISOCYANATE, SAID SECOND POLYMER HAVING BEEN PREPARED AT A CALCULATED NCO/OH OF FROM ABOUT 1.005 TO ABOUT 1.100.