Process for preparing positive and negative images using photohardenable electrostatic master
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0315121A2
公开(公告)日:1989-05-10
Process for producing negative or positive images from a photohardenable electrostatic master comprising an electrically conductive substrate bearing a photohardenable layer containing a photoinhibitor and a visible light sensitizer wherein the negative image (1) is prepared by (a) imagewise exposing to visible radiation, (b) charging electrostatically the master, (c) developing the charged image with an electrostatic toner, e.g., liquid electrostatic developer, and (d) transferring the toner image to a surface, e.g., paper. The positive image (2) is prepared by (a) imagewise exposing to ultraviolet radiation, (b) exposing overall to visible radiation followed by steps (b), (c) and (d) above. Multiple images can be prepared from the same master as well as color proofs using different color toners or developers and transferring in register over the original image.
用光硬化静电母版制作负像或正像的工艺,该母版由导电基板和光硬化层组成,光硬化层含有光抑制剂和可见光增感剂,其中负像(1)的制备方法是:(a)将图像曝光在可见光辐射下,(b)对母版进行静电充电,(c)用静电调色剂(如液体静电显影剂)显影带电图像,(d)将调色剂图像转移到表面(如纸张)上。正像 (2) 的制备方法是:(a) 将图像曝光在紫外线辐射下;(b) 将整个图像曝光在可见光辐射下,然后执行上述步骤 (b)、(c) 和 (d)。可以使用不同颜色的调色剂或显影剂从同一母版上制作多个图像以及彩色样张,并在原始图像上进行套准转移。