Generation and use of dinitrile oxides
AssigneeImperial Chemical Industries PLC
InventorsJohn Crosby, Robert Allan Campbell Rennie, John Tanner, Robert Michael Paton
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Abstract
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.
Claims21
A process for the modification of a polyfunctional species which comprises mixing the said species with a furoxan containing a monocyclic or polycyclic ring system fused to the carbon atoms of the furoxan ring, and subsequently heating the mixture to a temperature at which a dinitrile oxide compound is generated in situ by thermal decomposition at a temperature ranging from 30.degree.-280.degree.C of the furoxan and caused to react with the said polyfunctional species, wherein the polyfunctional species contains functional groups capable of entering into 1-3 addition or 1-3 cycloaddition reactions with the nitrile oxide and wherein said polyfunctional species is monomeric or polymeric and if said species is monomeric then the molar proportion of furoxan:
- monomeric material is between 3:2 to 2:3 and if said species is polymeric, then furoxan:polymeric material is 1:3 to 1:1000.
A thermally curable polymeric composition which comprises a polymeric material containing functional groups capable of entering into addition reactions with a dinitrile oxide, admixed with a furoxan containing a monocyclic or polycyclic ring system fused to the carbon atoms of the furoxan ring.
Dependencies are inferred from the claim text.