original lithographic printing plate
A technology of lithographic printing plate and original plate, applied in lithographic printing equipment, printing, printing technology, etc., can solve the problems of high printing durability and tone reproducibility of difficult lithographic printing plates
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Embodiment 1 to 20 and comparative example 1 to 5
[0306] [1] Preparation of lithographic printing plate precursors (1) to (20)
[0307] (1) Preparation of support
[0308] An aluminum plate (material: JIS A1050) having a thickness of 0.3 mm was degreased at 50° C. for 30 seconds using a 10% by weight aqueous solution of sodium aluminate to remove rolling oil on its surface, and then three Nylon brush with nylon bristles of 0.3 mm and an aqueous suspension of pumice with a median size of 25 μm (specific gravity: 1.1 g / cm 3 ) Graining the surface of the aluminum plate, and then fully washing with water. The plate was etched by dipping in 25 wt% aqueous sodium hydroxide solution at 45°C for 9 seconds, washed with water, then dipped in 20 wt% nitric acid solution at 60°C for 20 seconds, and washed with water. The amount of etching on the grained surface is about 3g / m 2 .
[0309] Then, the electrochemical roughening treatment was continuously performed on the plate using an alternating current of 60 Hz. The electrolytic solu...
Embodiment 21 and comparative example 6
[0355] In the same manner as in the preparation of the above-mentioned lithographic printing plate precursor (1), except that the coating liquid (B) for the image-recording layer shown below was used instead of the coating liquid (A) for the image-recording layer A planographic printing precursor (21) for Example 21 was prepared.
[0356] And, except that the RAFT agent used in the coating liquid (B) for the image-recording layer was not added, the lithographic printing plate used in Comparative Example 6 was prepared in the same manner as in the preparation of the lithographic printing plate precursor (21). Version original (R6).
[0357]
[0358]
[0359] The obtained lithographic printing plate precursor was evaluated in the same manner as in Example 1, and the obtained results are shown in Table 2. In Table 2, the results of Example 7 and Comparative Example 1 are also described for comparison.
[0360] Table 2: Example 21 and Comparative Example 6
[0361]
Embodiment 22
[0363] A coating liquid (1) for a protective layer having a composition shown below was further coated on the image recording layer of the lithographic printing plate precursor (21) by a bar, and dried in an oven at 120° C. for 60 seconds to form With 0.15g / m 2 A dry coating amount of the protective layer, thereby preparing a lithographic printing plate precursor (22).
[0364]
[0365]
[0366] (Preparation of Dispersion Liquid (1) of Inorganic Layered Compound)
[0367] To 193.6 g of ion-exchanged water was added 6.4 g of synthetic mica (SOMASIF ME-100, manufactured by CO-OP Chemical Co., Ltd.), and the mixture was dispersed using a homogenizer until the average particle diameter (according to the laser light scattering method) became 3 μm. The aspect ratio of the thus dispersed inorganic particles is 100 or more.
[0368] The obtained lithographic printing plate precursor (22) was evaluated in the same manner as in Example 1 and the obtained results are shown in Tab...
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