A photocurable composition, prepared by mixing and addition reacting (a) at least a compound of formula, with (b) at least an ethylenically unsaturated compound capable of undergoing free radical polymerization; Wherein, amine promoter compound is added in said addition reaction; and in the compound of formula, R 1, R 2, R 3, R 4, and R 5 independently of one another are H, C 1 -C 12 alkyl, C 1 -C 12 alkoxy, optionally OH and/or OR 6 substituted C 2 -C 40 alkoxy, one or more O interrupted C 2 -C 40 alkoxy, optionally OH and/or OR 6 substituted and one or multiple O interrupted C 2 -C 40 alkoxy, CN, CF 3, F, CI, or Br; wherein R 6 is C 1 -C 12 alkyl, or phenyl; or R 1 and R 5 =H, R 2, R 3, R 4 independently of one another are SR 7, NR 8 R 9, C 4 -C 5 naphthenic imino, phenyl, or substituted phenyl, wherein R 7 is H, C 1 -C 12 alkyl, optionally OH and/or OR 6 substituted C 2 -C 40 alkyl, one or multiple O interrupted C 2 -C 40 alkyl, optionally OH and/or OR 6 substituted and one or multiple O interrupted C 2 -C 40 alkyl, phenyl, or C 1 -C 4 substituted phenyl, R 8, R 9, and R 10 independently of one another are C1- C 12 alkyl, optionally OH and/or OR 6 substituted C 2 -C 40 alkyl, one or multiple O interrupted C 2 -C 40 alkyl, optionally OH and/or OR 6 substituted and one or multiple O interrupted C 2 -C 40 alkyl, phenyl, or C 1 -C 4 substituted phenyl, and R 6 is C 1 -C 12 alkyl, or phenyl; or R 1, R 2, R 4, and R 5 =H, and R 3 is SR 7, NR 8 R 9, C 4 -C 5 naphthenic imino, phenyl, or substituted phenyl, wherein R 7 is C 1 -C 12 alkyl, or phenyl, R 8, R 9, and R 10 independently of one another are C 1 -C 12 alkyl, optionally OH and/or OR 6 substituted C 2 -C 40 alkyl, one or multiple O interrupted C 2 -C 40 alkyl, optionally OH and/or R 6 substituted and one or multiple O interrupted C 2 -C 40 alkyl, phenyl, or C 1 -C 4 substituted phenyl; wherein R 6 is C 1 -C 12 alkyl, or phenyl; and wherein the component (a) is in an amount of 0.05-75 % by weight relative to the total weight of said composition. (a) at least a compound of formula, with (b) at least an ethylenically unsaturated compound capable of undergoing free radical polymerization; Wherein, amine promoter compound is added in said addition reaction; and in the compound of formula, R 1, R 2, R 3, R 4, and R 5 independently of one another are H, C 1 -C 12 alkyl, C 1 -C 12 alkoxy, optionally OH and/or OR 6 substituted C 2 -C 40 alkoxy, one or more O interrupted C 2 -C 40 alkoxy, optionally OH and/or OR 6 substituted and one or multiple O interrupted C 2 -C 40 alkoxy, CN, CF 3, F, CI, or Br; wherein R 6 is C 1 -C 12 alkyl, or phenyl; or R 1 and R 5 =H, R 2, R 3, R 4 independently of one another are SR 7, NR 8 R 9, C 4 -C 5 naphthenic imino, phenyl, or substituted phenyl, wherein R 7 is H, C 1 -C 12 alkyl, optionally OH and/or OR 6 substituted C 2 -C 40 alkyl, one or multiple O interrupted C 2 -C 40 alkyl, optionally OH and/or OR 6 substituted and one or multiple O interrupted C 2 -C 40 alkyl, phenyl, or C 1 -C 4 substituted phenyl, R 8, R 9, and R 10 independently of one another are C1- C 12 alkyl, optionally OH and/or OR 6 substituted C 2 -C 40 alkyl, one or multiple O interrupted C 2 -C 40 alkyl, optionally OH and/or OR 6 substituted and one or multiple O interrupted C 2 -C 40 alkyl, phenyl, or C 1 -C 4 substituted phenyl, and R 6 is C 1 -C 12 alkyl, or phenyl; or R 1, R 2, R 4, and R 5 =H, and R 3 is SR 7, NR 8 R 9, C 4 -C 5 naphthenic imino, phenyl, or substituted phenyl, wherein R 7 is C 1 -C 12 alkyl, or phenyl, R 8, R 9, and R 10 independently of one another are C 1 -C 12 alkyl, optionally OH and/or OR 6 substituted C 2 -C 40 alkyl, one or multiple O interrupted C 2 -C 40 alkyl, optionally OH and/or R 6 substituted and one or multiple O interrupted C 2 -C 40 alkyl, phenyl, or C 1 -C 4 substituted phenyl; wherein R 6 is C 1 -C 12 alkyl, or phenyl; and wherein the component (a) is in an amount of 0.05-75 % by weight relative to the total weight of said composition.