Patent ID: 8445176

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 comprising at least two 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: wherein 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 at least one sensitizer of said mixture is an asymmetric sensitizer wherein R 1 ≠R 4 or R 2 ≠R 5 or R 3 ≠R 6 and wherein the total amount of asymmetric sensitizers in said mixture is at least 25 percent by weight relative to the total weight of said mixture.