Production of isocyanates

Details Production of isocyanates Production of isocyanates

1975-12-08

1977-06-14

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260307G, 260453AP, 260468E, 260488B, 260553A, C07C11800, C07C11945

Patent

active

040296865

ABSTRACT:
A furoxan, especially one in which the furoxan ring is fused to a strained aliphatic ring system, is heated in the presence of sulphur dioxide to give an isocyanate. The process enables furoxans, such as dicyclopentadiene furoxan, which ring-open at temperatures <180.degree. C to be converted into isocyanates. In the absence of sulphur dioxide, may be difficult to control the reaction and, in some cases, no isocyanate is obtained. Diisocyanates prepared by the process may be converted into polyurethanes by reaction with suitable hydroxylic compounds.

REFERENCES:
patent: 3925435 (1975-12-01), Crosby et al.

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