| abstract |
Carbodiimide (i) having the structure: with the following meanings for n, R 1 , R 2 , R 3 and R 4 : n: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20, R 1 : aliphatic, cycloaliphatic, araliphatic or aromatic, optionally substituted, optionally branched-chain radical, R 2 : aliphatic, cycloaliphatic, araliphatic or aromatic, optionally substituted, optionally branched-chain radical, R 3 is H, -CH 3 or -CH 2 -CH 3 , R 4 : H, -CH 3 or -CH 2 -CH 3 , characterized in that the content of 1-methyl-2,5-dihydro-phospholene-1-oxides and 1-methyl-2,3-dihydro-phospholene-1-oxides is less than 100 ppm, based on the weight of the carbodiimide ( i). |