Imperial Chemical Industries Limited

Robert Michael Paton

John Crosby

Robert Allan Rennie

John Tanner

2,4-DIISOCYANATO BICYCLO (3,3,0)-OCT-6-ENE, A NEW COMPOUND AND ITS PREPARATION AND USE ARE DISCLOSED.

2,4-Diisocyanato bicyclo (3,3,0)-oct-6-ene

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 &lt;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.

Production of isocyanates

3,4-Cycloalkano furoxans are produced and are found to be useful in cross-linking of polymers.

3,4-Cycloalkano furoxans

The in situ thermal decomposition of specified furoxans to yield dinitrile oxides is used to modify a polyfunctional species. Preferred uses involve cross-linking of polymers, especially rubbers, but the process may also be used to form polymers from monomeric materials or to bind additives to polymeric substrates. Compositions incorporating polymeric materials and suitable furoxans may be used as 'one-shot' casting systems or be produced in the form of thermally curable sheets, etc, having useful shelf-lives.

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Edinburgh, United Kingdom

Robert Michael Paton