Patent ID: 8563222

Claim:
A lithographic printing plate precursor comprising an image-recording layer, said image-recording layer being photo-polymerizable upon exposure with light having a wavelength of from 300 to 500 nm and comprising a mixture of sensitizers, said mixture comprises at least three different sensitizers according to Formula I, wherein R 1 to R 6 independently represent a hydrogen atom, an optionally substituted alkyl group, an optionally substituted alkoxy group, a cyano group, a halogen atom, a dialkylamino group, an alkylarylamino group or a diarylamino group; L is a divalent linking group selected from the group consisting of: n is an integer from 0 to 2; X represents S, O or NR x ; * represents the linking positions of the linking group L to the phenyl groups of Formula I; R, R′ and R x represent an optionally substituted alkyl group; wherein for at least two sensitizers of said mixture at least one of R 1 to R 6 contains an asymmetric C-atom and the total amount of two or more sensitizers of which at least one of R 1 to R 6 contains an asymmetric C-atom is more than 65 percent by weight relative to the total weight of said mixture.