Patent ID: 6844080

Claim:
A polymerisable composition comprising: a) at least one free-radically polymerisable monomer component, and b) an effective amount of an initiator system for initiating polymerisation of the free-radically polymerisable monomer, said initiator system comprising a metal alkyl borohydride of the formula I or II: wherein R 1 is C 1 -C 10 alkyl, R 2 and R 3 , which may be the same or different, and are selected from the group consisting of H, D, C 1 -C 10 alkyl, C 3 -C 10 cycloalkyl, phenyl, phenyl-substituted C 1 -C 10 alkyl, and phenyl-substituted C 3 -C 10 cycloalkyl, provided that any of R 1 -R 3 may optionally be part of a carbocyclic ring, and M + is a metal ion.