| 摘要 |
An air-activatable polymerisable composition useful, for example, in the field of adhesives, sealants, surface coatings, moulding resins and composite matrices, comprises: a) at least one free-radically polymerisable monomer, b) an activator system for effective polymerisation of the free-radically polymerisable monomer, said activator system comprising at least one auto-oxidisable compound which is a beta diketone, c) a soluble ionic salt, particularly a transition metal salt, d) and a weak acid or a latent weak acid, with the proviso that the composition does not contain a peroxide, or a peroxide precursor which produces peroxide in the absence of air, or any ingredient which is a significant source of radicals in the absence of air. Suitable auto-oxidisable beta diketone compounds are represented by formula (VII) wherein the lines representing unfilled valencies indicate bonds to carbon, hydrogen or hetero atoms. One group of beta-diketone compounds is of formula (1) wherein R4 and R5 which may be the same or different are optionally substituted alkyl, optionally substituted alkoxy or NR7R8 wherein R7 and R8 which may be the same or different are optionally substituted alkyl, and R6 is H, optionally substituted alkyl, or optionally substituted alkoxy. Stability of the composition is improved by addition of a nitroxyl free radical stabiliser.
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