C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
260/455
C08G 18/70 (2006.01) C07C 207/00 (2006.01) C07D 271/12 (2006.01) C07D 273/00 (2006.01)
Patent
CA 1104148
ABSTRACT OF THE DISCLOSURE Process for the preparation of organic isocyanates in which a furoxan is heated in the presence of a vicinal di- keto compound containing two adjacent keto carbonyl groups. When the furoxan ring is fused to an organic ring system di-isocyanates are produced. An adduct of the furoxan and the diketo compound may be isolated from the reaction mixture and used as a stable isocyanate precursor in, for example, a "one- pot" polyurethane composition. The adduct may be represented by the structure Image wherein X represents an acyclic or cyclic divalent hydrocarbonyl group and Y, Z which may be the same or different are hydro- carbyl groups which are either separate or combined into one cyclic system.
275353
Crosby John
Milner John A.
Drouin Guy
Imperial Chemical Industries Limited
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