Lithographic printing plate precursor comprising (a) a lithographic substrate with a hydrophilic surface and (b) a radiation-sensitive coating on the hydrophilic surface comprising (i) one or more types of monomers and/or oligomers and/or polymers, each comprising at least one ethylenically unsaturated group accessible to a free-radical polymerization, (ii) at least one sensitizer, and (iii) at least one coinitiator capable of forming free radicals together with the sensitizer, said coinitiator being other than metallocenes, characterized in that the at least one sensitizer comprises a compound of formula (I) wherein at least one of the groups R
9
to R
12
is a bulky group which has a van der Waals volume of at least 55 Å
3
.
含有光刻制版前体的石版印刷版,包括(a)具有亲
水表面的石版基板和(b)放射敏感涂层,在亲
水表面上包括(i)一种或多种单体和/或寡聚物和/或聚合物,每种都包括至少一个对自由基聚合可访问的
乙烯基不饱和基团,(ii)至少一种敏化剂,和(iii)至少一种与敏化剂一起能够形成自由基的协同
引发剂,所述协同
引发剂不是
金属茂基化合物,其特征在于至少一种敏化剂包括式(I)中的化合物,其中至少有一组R9到R12是具有至少55Å3的范德华体积的笨重基团。