31-07-2024 дата публикации
Номер: EP4406741A1
Provided are an imageable composition for a photosensitive negative lithographic printing plate, and a platemaking method therefor. The imageable composition comprises the following components in parts by mass: 25-65 parts of a free radical polymerizable compound, 0.5-25 parts of a photoinitiator, 10-60 parts of a binder, and 1-20 parts of a development accelerator. The platemaking method comprises the following steps: (1) coating a substrate, which has a hydrophilic surface or a hydrophilic layer, with an imageable composition to obtain a photosensitive negative lithographic printing plate precursor; (2) exposing the lithographic printing plate precursor by using laser light and according to a required image, so as to form an exposed region and an unexposed region; and (3) removing the unexposed region from the exposed printing plate precursor by means of a development process, so as to obtain a required lithographic printing plate. By means of the imageable composition and the platemaking method, a flexible development procedure of "on-machine development" or "off-machine development" can be realized, and a prepared printing plate has an excellent printing performance.
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