| abstract |
The present invention relates to polyaspartate mixtures containingn a) 5 to 50 equiv.%, based on the total equivalents of aspartate groups,nof a polyoxypropylene polyaspartate corresponding to the formulan nwherein X 1 represents the residue obtained by removing the aminongroups from a polyoxypropylene polyamine having a functionality of n, R 1 nand R 2 are identical or different and represent organic groups which areninert to isocyanate groups at a temperature of 100°C or less, R 3 and R 4 nare identical or different and represent hydrogen or organic groups whichnare inert towards isocyanate groups at a temperature of 100°C or less andnn is 2 to 4, and b) 50 to 95 equiv.%, based on the total equivalents of aspartatengroups, of a polyether polyaspartate corresponding to the formula Inwherein X 1 represents the residue obtained by removing the amino groupsnfrom a polyether polyamine having a functionality of n and a numbernaverage molecular weight of less than 5000, wherein the amino groupsnare attached to primary carbon atoms and the ether groups are separatednby at least two carbon atoms. n The present invention also relates to a process for preparing thesenpolyaspartate mixtures and to the polyureas prepared by reacting thenpolyaspartate mixtures and optionally other isocyanate-reactivencompounds with polyisocyanates. |