| 摘要 |
Blocked isocyanates of the general formula <IMAGE> are obtained by converting terephthalic dialdoxime, isophthalic dialdoxime or an aliphatic, cycloaliphatic or aromatic ketoxime or an aromatic aldoxime of the general formula <IMAGE> in the presence of 10-100 Mol % sodium, potassium or calcium hydroxide, with the sodium, potassium or calcium salt of a bis-N-chloramide of the general formula Cl-NH-CO-R-CO-NH-Cl in water or a mixture of water and an aprotic solvent. Preferred first components include terephthalic dialdoxime, benzaldehyde-, cyclohexanone-, acetone- and acetophenoneoxime. Preferred aprotic solvents include dimethyl acetamide, dimethylformamide, sulfolan and tetramethylurea.
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