Patent ID: 7527916

Claim:
A composition that is photopolymerizable upon absorption of light in the wavelength range from 300 to 450 nm, the composition comprising a binder, a polymerizable compound, a sensitizer and a photoinitiator, wherein the sensitizer is an optical brightening agent having a solubility in methyl ethyl ketone of at least 15 g/kg measured at 20° C., wherein the sensitized has a structure according to formula (IIIa) or (IVa): R 1 , R 5 , R 6 , R 10 , R 11 , R 12 , R 13 and R 14 independently represent a hydrogen atom, a fluorine atom or a chlorine atom, R 2 to R 4 and R 7 to R 9 independently represent alkoxy groups, and at least two of the alkoxy groups are branched and have from 3 to 15 carbon atoms or R 15 , R 19 , R 20 , R 24 , and R 25 , to R 32 , independently represent a hydrogen atom, a fluorine atom or a chlorine atom, and R 16 to R 18 and R 21 to R 23 , independently are alkoxy groups, and at least two of the alkoxy groups are branched and have from 3 to 15 carbon atoms.