Negative working, peel developable, single sheet color proofing system with improved background color

• Main Authors: WOJCIECH A. WILCZAK, GABOR I. KOLETAR
• Format: Patent
• Language: English
• Published: 03.09.1998
• Edition: 6
• Subjects: APPARATUS SPECIALLY ADAPTED THEREFOR; CINEMATOGRAPHY; ELECTROGRAPHY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HOLOGRAPHY; MATERIALS THEREFOR; ORIGINALS THEREFOR; PHOTOGRAPHY; PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES; PHYSICS; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS

In the present invention, one produces a negative-acting color proofing element comprising, sequentially: a strippable cover sheet which is transparent to actinic radiation; a crosslinked layer containing a polymer having phenolic groups; a color layer, containing a colorant, a polymeric binder, a polymerizable monomer and, optionally, a photoinitiator; a photoadhering layer, containing a linear photosensitive polymer containing ethylenically unsaturated, free-radical polymerizable groups and having a weight average molecular weight greater than 3,000, a polymerizable monomer,and, optionally, a free radical photoinitiator, a thermoplastic adhesive layer, and a receiver sheet, at least one of the color layer and the photoadhering layer containing the photoinitiator, which comprises at least one of: (I) a chromophore-substituted bis-trichloromethyl-s-triazine, (II) a combination of an acyl or diacyl phosphine oxide and a fluorescent optical brightener, or (III) a combination of a hexaaryl biimidazole compound, a chain-transfer agent and a fluorescent optical brightener.