| 摘要 |
Use of an initiator system comprising: a combination of an organoborane and a polyaziridine, in a ratio of groups to boron atoms of greater than 1.3:1, as an initiator of polymerisation in an adhesive composition for bonding a low surface energy substrate; provided that the initiator system does not contain more than a trace amount of a complex of organoborane with a complexing agent selected from: an amine other than a polyaziridine; a complexing agent comprising at least one hydroxide; a complexing agent comprising at least one alkoxide; or amidine complexing agent. An initiator system as described is of the formula VI: wherein R<1 >is C1-C10 alkyl, R<2 >and R<3>, which may be the same or different, are, C1-C10 alkyl or C3-C10 cycloalkyl, phenyl, or phenyl-substituted C1-C10 alkyl or C3-C10 cycloalkyl, provided that any two of R<1>-R<3 >may optionally be part of a carbocyclic ring; R<5 >is a polyvalent radical, R<6 >and R<7 >which may be the same or different are H or C1-C10 alkyl, particularly C1-C4 alkyl, especially methyl, and y is a number of at least 2, particularly 2-4, especially 3, and the value of x multiplied by y is greater than 1.3. Particular examples of initiator compounds include, trimethylol propane tris(3-(2-methyl aziridino))propionate and trimethylol propane tris-3-N-aziridinyl propionate.
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