Lithographic printing plates comprising an aluminum support grai

Details Lithographic printing plates comprising an aluminum support grai Lithographic printing plates comprising an aluminum support grai

1991-07-22

1992-06-16

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041294, 20412975, 156665, 205214, C25F 304

Patent

active

051222434

ABSTRACT:
Improved lithographic printing plates comprise an aluminum support which has been grained in a novel two-stage electrolytic graining process and a radiation-sensitive layer capable of forming a lithographic printing surface. The aluminum support is subjected to an electric current while immersed in an acidic electrolyte solution, such as a solution comprised of hydrochloric acid and aluminum chloride. Current density in the first stage of the process is at least as great and preferably substantially greater than in the second stage, while both treatment time and current consumption in the first stage are less than in the second stage. The process provides a fine uniform grain that is essentially free of pits. Any radiation-sensitive layer is suitable, which after exposure and any necessary developing and/or fixing provides an area in imagewise distribution which can be used for printing.

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