| 摘要 |
1508077 Isocyanates from chloromethyl or chloromethylene compounds KAO SOAP CO Ltd 13 May 1976 [21 May 1975] 19773/76 Heading C2C [Also in Division C3] Isocyanic acid derivatives, which have an isocyanatomethyl or isocyanurate group are made by reacting, at 70-200‹ C., an organic halogen compound having a monohalomethyl or monohalomethylene group with at least one alkali metal or ammonium cyanate in an organic solvent selected from N,N-disubstituted organiccarboxylic acid amides, N,N - disubstituted organic sulphonic acid amides, dialkyl sulphoxides, dialkyl sulphones, polyalkylene sulphoxide, polyalkylene sulphone, macrocyclic polyethers containing recurring -O-CH 2 -CH 2 - groups, at least part of the reacting taking place in the presence of 1-20% by weight based on said organic halogen compounds of at least one polyhalogen compound selected from compounds containing dihalomethyl, dihalomethylene or trihalomethyl groups or tetrahalomethanes. |
