PHOTOPOLYMERIZABLE COMPOSITIONS

摘要

A photopolymerization accelerator composition improving color stability a nd controlling polymerization shrinkage stress of cured resin and/or the res ulting composite paste thereby feature by tertiary twisted biphenyldiamine w ith the general formula I: R2 and R3 are each independently alkyl having fro m 1 to 5 carbon atoms; R and Rl are each independently hydrogen or halogen; alkyl, alkoxy, or alkylthio having from 1 to 18 carbon atoms; or phenyl and/ or substituted phenyl alkoxy, or alkylthio having from 1 to 18 carbon atoms. It can be used in part with conventional photosensitizers and radically pol ymerizable monomers.