Aluminium alloy support for planographic printing plate

摘要

Disclosed is an aluminum alloy support for a planographic printing plate, wherein the sodium content of the support is 0.005 to 0.040 weight %. Also disclosed is a presensitized planographic printing plate comprising the claimed aluminum alloy support and provided thereon a light sensitive layer containing an alkali soluble resin and an o-quinonediazide compound.