Light-sensitive element for printing plate or photoresist mfr. - with thin oil film between imaging mask and positive- or negative-working layer to prevent dust deposition and give smooth plates

摘要

The novel feature in a flat, curved or cylindrical UV- and/or visible light-sensitive recording element of the type comprising (A) a dimensionally stable carrier, (B) a negatively- or positively-working recording layer (B1) or (B2) and (D) a repeatedly-removable, multi-use imaging mask is that between (B) and (D) there is present (C) a transparent 0.01-10 microns thick layer of a viscous, inert, wetting oil which has a higher RI than sensitive layer (B1) or (B2) and mask (D). Also claimed is an embodiment in which there is also a covering layer (E) of transparent, tear-resistant polymer film between layer (B) and oil film (C); in either case layer (C) forms a complete cover on the underlying layer. USE/ADVANTAGE - The element is used for mfr. of photoresists or of flat, curved or cylindrical printing plates. The prior art problems of contacting and dust deposition are overcome and the element can be used without a vacuum table. Also, it can be used with the smooth (B) or (E) layers required for prodn. of dabbing-type printing plates.