| abstract |
Abstract of the disclosure: A photopolymerizable recording composition which comprises a mixture, containing a photo-initiator, of a) a photopolymerizable olefinically unsatur-ated monomer and b) an organic polymeric binder, wherein the photoinitiator is an acylphosphine oxide compound of the formula R1R2PO-CO-R3, where R1 and R2 are certain organic radicals and R3 is tert.-alkyl or a cyclic radical with two substituents in the ortho-position to the carbonyl group. The recording compositions have a high reactivity when irradiated with W light and are used in particular for the preparation of printing plates, relief plates and photo-resists. |