Linear polyureas prepared from the reaction of urea and two different alkylene diamines

Claim 1

THE METHOD OF PRODUCING POLYUREA COPOLYMERS CAPABLE OF BEING READILY SPUN INTO FIBERS COMPRISING REACTING IN AN INERT ATMOSPHERE, UREA AND AT LEAST TWO MEMBERS SELECTED FROM THE GROUP CONSISTING OF LINEAR ALKYLENE DIAMINES HAVING FROM 6 TO 12 CARBON ATOMS IN THE ALKYLENE CHAIN AND THEIR CARBONATES, SAID MEMBERS HAVING DIFFERENT NUMBERS OF CARBON ATOMS IN THEIR ALKYLENE CHAINS, IN CONTACT WITH A VISCOSSITY STABILIZER, IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF WATER AND META-CRESSOL, AT A TEMPERATURE OF 100*C. TO 130*C. TO PRODUCE AN INTERMEDIATE REACTION PRODUCT AND THEREAFTER RAISING THE TEMPERATURE TO 220*C. TO 270*C. TO FORM A SPINNABLE, FIBERFORMING POLYUREA COPOLYMER.

Claim 2

THE METHOD OF PRODUCING POLYUREA COPOLYMERS CAPABLE OF BEING READILY SPUN INTO FIBERS COMPRISING REACTING IN AN INERT ATMOSPHERE, UREA AND AT LEAST TWO MEMBERS SELECTED FROM THE GROUP CONSISTING OF LINEAR ALKYLENE DIAMINES HAVING FROM 6 TO 12 CARBON ATOMS IN THE ALKYLENE CHAIN AND THEIR CARBONATES, SAID MEMBERS HAVING DIFFERENT NUMBERS OF CARBON ATOMS IN THEIR ALKYLENE CHAINS, IN CONTACT WITH A VISCOSSITY STABILIZER, IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF WATER AND META-CRESSOL, AT A TEMPERATURE OF 100*C. TO 130*C. TO PRODUCE AN INTERMEDIATE REACTION PRODUCT AND THEREAFTER RAISING THE TEMPERATURE TO 220*C. TO 270*C. TO FORM A SPINNABLE, FIBERFORMING POLYUREA COPOLYMER.