| 摘要 |
A photohardenable element comprising a support bearing, in order, optionally a solvent-soluble nonphotosensitive layer, at least one photohardenable layer and a nonphotosensitive liquid removable layer, the photohardenable layer present immediately beneath the nonphotosensitive layer having therein substantially discrete, inert particles at least some of which cause protuberances in the nonphotosensitive layer. The particles have a size range of 0.1 to 10.0 mu m, not more than 50% by volume being below 3.5 mu m. A preferred element contains two photohardenable layers, the lower layer having an optical density greater than 3.0 over at least the 300 to 550 nm spectral region. The elements can be used for the preparation of proofs and printing plates. |
