1 0 3 31 22 3 200 20 0 5 2 71 23 4 200 20 3 5 177 2 50 24 5 200 20 2 5 176 2 5 25 6 200 20 4 0 176 2 53 3 33 26 7 200 20 5 0 172 2 10 27 8 200 20 3 0 28 9 200 40 4 2 176 2 80 29 10 200 20 5 0 176 2 41 30 11 200 20 3 5 175 2 15 6 10 31 12 240 30 16 0 164 2 17 32 13 200 20 8 0 166 1 96 33 14 170 60 0 13 nmb 34 15 200 20 0 50 177 2 55 4 60 35 16 200 20 0 07 172 nmb 4 30 36 17 200 20 0 13 nmb 37 18 200 20 3 5 nmb 38 19 200 20 1 0 178 1 83 3 40______________________________________ the meaning of the abbreviations in table 2 is as follows mp dsc melting point maximum measured by means of the dsc method u03bcrel relative solution viscosity measured as a 0 5 percent solution in metakresol these examples contain liquid systems based on dmpu as solvating agent s and are produced by means of the reaction of sodium methylate with caprolactam in dmpu and subsequent addition of carbodiimide or respectively capped isocyanate production took place in accordance with the description in connection with examples 1 to 19 storage stable reddish brown liquids.