| abstract |
The use of a compound of formula (A), which comprises a group of sub-formula (I) where R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , X 1 and Y 1 are various specified organic groups wherein at least one of said groups has sufficient electron whitdrawing properties to activate the multiple bonds to polymerisation, in a stereolithographic composition. Stereolithographic applications of these compounds are also described and claimed. |