Method for the preparation of organic isocyanates

Details Method for the preparation of organic isocyanates Method for the preparation of organic isocyanates

C - Chemistry, Metallurgy

07

C

C07C 263/04 (2006.01) C07C 265/12 (2006.01)

Patent

CA 2289656

Method for the preparation of aromatic monomeric or polymeric isocyanates by decomposing aromatic monomeric or polymeric carbamates of the formula R1(NHCOOR2)x wherein x is at least 1, R1 is an aromatic radical of valency x and R2 is a monovalent organic radical, into aromatic monomeric or polymeric isocyanates of the formula R1(NCO)x and alcohols of the formula R2OH, characterised in that the radical R2 is substituted by a group containing at least one halogen group.

L'invention concerne un procédé de préparation d'isocyanates aromatiques monomériques ou polymériques par décomposition de carbamates aromatiques monomériques ou polymériques de la formule R?1¿(NHCOOR?2¿)¿x? dans laquelle x représente au moins 1, R?1¿ représente un radical aromatique de valence x et R?2¿ représente un radical organique monovalent, en isocyanates aromatiques monomériques ou polymériques de la formule R?1¿(NCO)¿x? et en alcools de la formule R?2¿OH caractérisée par le fait que le radical R?2¿ est substitué par un groupe contenant au moins un groupe halogène.

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