| 摘要 |
A photosensitive printing element is used for preparing flexographic printing plates. The photosensitive printing element comprises (a) a flexible support, (b) a photopolymerizable layer comprising an elastomeric composition sensitive to non-infrared actinic radiation, said layer being soluble, swellable or dispersible in a liquid developer prior to exposure to said non-infrared actinic radiation, and (c) at least one layer comprising an infrared radiation sensitive thermographic material which provides excellent image density (e.g., greater than 3.0) at least in the electromagnetic region of said non-infrared radiation sensitivity and preferably in both the visible and ultraviolet regions of the electromagnetic spectrum upon exposure to infrared laser radiation and thermal development. The mask may be on top of the elastomeric composition or underneath the elastomeric composition (where the flexible support is transparent). |
