A method for making a lithographic printing plate support
A technology for lithographic printing and printing plate precursors, applied in the field of making thermal and/or photosensitive lithographic printing plates including said carrier, capable of solving the problems of large equipment expenditure, no matte surface, etc.
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[0073] Suitable examples of sulfonamide (co)polymers and / or processes for their preparation are disclosed in EP-A 933 682, EP-A 982 123, EP-A 1 072 432, WO 99 / 63407 and EP-A 1,400,351.
[0074] Highly preferred examples of sulfonamide (co)polymers are homopolymers or copolymers comprising structural units represented by the following general formula (I):
[0075]
[0076] Formula (I)
[0077] in:
[0078] R 1 represents hydrogen or a hydrocarbon group having up to 12 carbon atoms; R 1 preferably represents hydrogen or methyl;
[0079] R 2 and R 3 independently represents hydrogen or hydrocarbon group; R 2 and R 3 preferably represents hydrogen;
[0080] x 1 Represents a single bond or a divalent linking group. The divalent linking group may have up to 20 carbon atoms and may contain at least one atom selected from C, H, N, O and S. Preferred divalent linking groups are linear alkylene groups having 1-18 carbon atoms, linear, branched or cyclic groups having 3-18 ...
Embodiment 1
[0130] 1.1 Preparation of lithographic substrates
[0131] A 0.3 mm thick AA1050 aluminum sheet was first degreased in NaOH (25 g / l) for 10 seconds at 70° C. and washed in deionized water for 5 seconds at room temperature. Afterwards, the sheets were neutralized in a dilute hydrochloric acid solution of pH 2 The charge density and 120A / dm 2 The current density of the aluminum sheet is potentiostatic (constant voltage) roughened. The roughening process was carried out in a 12.5 g / l hydrochloric acid solution. The obtained substrate was comparative lithographic support PPS-0.
[0132] The lithographic supports PPS-1 to PPS-10 according to the invention were obtained by adding the additives summarized in Table 1 at two different concentrations (0.0034M and 0.034M).
[0133] Table 1: printing plate carrier of the present invention
[0134] Printing plate carrier (PPS) Additional additives concentration
m PPS-1a benzoic acid 0.0034 PPS-1b benzoic...
Embodiment 2
[0143] 2.1 Preparation of lithographic substrates
[0144] A 0.3 mm thick AA1050 aluminum was first degreased in NaOH (25 g / l) for 10 seconds at 70° C. and washed in deionized water for 5 seconds at room temperature. Afterwards, it was neutralized in dilute hydrochloric acid solution (pH≦2) for 10 seconds at room temperature and washed again in deionized water for 5 seconds at room temperature. Finally, use 960C / dm at 37°C 2 The charge density and 120A / dm 2 The current density makes it constant potential (constant voltage) roughening. The roughening process was carried out in a 12.5 g / l hydrochloric acid solution. The obtained substrate was comparative lithographic support PPS-11.
[0145] The lithographic supports PPS-12 to PPS-21 according to the invention were obtained by adding three different concentrations (0.00034M, 0.0034M and 0.034M) of the additives summarized in Table 1 to a roughening solution containing 12.5 g / l hydrochloric acid .
[0146] Table 3: Printi...
PUM
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