Developing solution for photosensitive lithographic printing plate, plate-making method of lithographic printing plate, and photosensitive lithographic printing plate
AssigneeFuji Photo Film Co., Ltd.
InventorsMitsumasa Tsuchiya, Hiroyuki Nagase, Shunichi Kondo, Kazuto Kunita
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Abstract
A plate-making method of a lithographic printing plate is disclosed, which comprises the steps of exposure of a photo-sensitive lithographic printing plate having the acid value of a photosensitive layer of 1.0 meq/g or less with a laser beam, and then development with a developing solution having a pH value of 13.0 or less at a developing speed in an unexposed domain of 0.05 μm/s or more and at an osmotic speed of a developing solution in an exposed domain of 0.1 μm/s or less.
Claims10
A plate-making method of a lithographic printing plate which comprises the steps of exposure of a photo-sensitive lithographic printing plate comprising a support having an anodized film on the surface having provided thereon a photopolymerizable photosensitive layer containing a compound having an addition polymerizable ethylenically unsaturated double bond, a high polymer soluble or swelling in an alkali aqueous solution, and a photopolymerization initiator with a laser beam, and then development with a developing solution comprising an alkali aqueous solution containing 2 to 10 wt % of at least one of a nonionic aromatic ether-based activator represented by the following formula (I-A) and a nonionic aromatic ether-based activator represented by the following formula (I-B):
- wherein R1 represents H or an alkyl group having from 1 to 100 carbon atoms, and n represents an integer of from 0 to 100 and m represents an integer of from 0 to 100 and the sum of n+m is at least 3,
- wherein R2 represents H or an alkyl group having from 1 to 100 carbon atoms, and n and m each represents an integer of from 0 to 100.
Dependencies are inferred from the claim text.