[N:1]([CH:4]1[CH2:9][C:8]([CH3:14])([CH2:10][N:11]=C=O)[CH2:7][C:6]([CH3:16])([CH3:15])[CH2:5]1)=C=O.CP1(=O)CCC=C1.CP1(=O)CC=CC1.C(=O)=O.C(O)(=O)C(C)=C>CN(C)C=O>[NH2:1][CH:4]1[CH2:9][C:8]([CH3:14])([CH2:10][NH2:11])[CH2:7][C:6]([CH3:16])([CH3:15])[CH2:5]1After the prepolymer has been cooled to 50° C., 695 parts by weight of dimethyl formamide and 44.4 parts by weight (0.2 mol) of 1-isocyanato-3,3,5-trimethyl-5-isocyanato methyl cyclohexane are added. 34.8 parts by weight (0.2 mol) of a mixture of 2,4- and 2,6-tolylene diisocyanate in a ratio of 8:2, and 2.4 parts by weight (0.02 mol) of a mixture of 1-methyl-1-phospha -2-cyclopenten-1-oxide and 1-methyl-1-phospha -3-cyclopenten-1-oxide, are added to the resulting solution. When the evolution of carbon dioxide has virtually stopped, 17.2 parts by weight (0.2 mol) of methacrylic acid in 17.2 parts by weight of dimethyl formamide are added, followed by stirring at 80° C. until a clear solution is formed. Chain extension with 48 parts by weight (0.28 mol) of 1-amino-3,3,5-trimethyl-5-aminomethyl cyclohexane in 100 parts by weight of dimethyl formamide at 25° C. gives a solution of a polyurethane acyl urea having a viscosity of 1650 cP at 24° C.
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