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US 3,943,146 AGranted
Sulfur dioxide - imidazole adducts
AssigneeMinnesota Mining and Manufacturing Company
InventorsNorman P. Sweeny, Karl Friedrich Thom
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Abstract
The disclosed compounds are adducts of imidazole or derivatives thereof and sulfur dioxide. The adducts are apparently of the Lewis acid-Lewis base type, and are useful as latent curing agents for epoxide resins. The adducts are prepared by interacting the imidazole and sulfur dioxide under anhydrous conditions. Equimolar imidazole-SO.sub.2 adducts can serve as a source of sulfur dioxide at room temperature.
Claims3
A compound of the formula
- (Imid).sub.n . SO.sub.2
- wherein
- n is a number from 1 to 4, and
- Imid is a compound of the formula ##EQU4## wherein R.sup.1, R.sup.2, R.sup.4 and R.sup.5 independently represent substituents selected from the group consisting of hydrogen;
- unsubstituted alkyl, alkenyl and alkinyl having 1 to 36 carbon atoms;
- phenyl;
- tolyl;
- xylyl and naphthyl, and together R.sup.4 and R.sup.5 can be the residue of a fused benzene ring.
5 more elements
Dependencies are inferred from the claim text.