Polyaspartate resins with good hardness and flexibility

摘要

The present invention relates to polyaspartate mixtures containing a) 5 to 50 equiv.%, based on the total equivalents of aspartate groups, of a polyoxypropylene polyaspartate corresponding to the formula <CHEM> wherein X1 represents the residue obtained by removing the amino groups from a polyoxypropylene polyamine having a functionality of n, R1 and R2 are identical or different and represent organic groups which are inert to isocyanate groups at a temperature of 100 DEG C or less, R3 and R4 are identical or different and represent hydrogen or organic groups which are inert towards isocyanate groups at a temperature of 100 DEG C or less and n is 2 to 4, and b) 50 to 95 equiv.%, based on the total equivalents of aspartate groups, of a polyether polyaspartate corresponding to the formula I wherein X1 represents the residue obtained by removing the amino groups from a polyether polyamine having a functionality of n and a number average molecular weight of less than 5000, wherein the amino groups are attached to primary carbon atoms and the ether groups are separated by at least two carbon atoms. <??>The present invention also relates to a process for preparing these polyaspartate mixtures and to the polyureas prepared by reacting the polyaspartate mixtures and optionally other isocyanate-reactive compounds with polyisocyanates.