| 摘要 |
Disclosed is a process of preparing a planographic printing plate from a light sensitive planographic printing plate material comprising a hydrophilic support and provided thereon, an image formation layer containing (A) at least one polymerization initiator selected from an arene-iron complex and a tribromoacetyl compound, (B) a polymerizable ethylenically unsaturated compound, and (C) an alkali soluble resin with an acid value of 5 to 200, the process comprising the steps of imagewise exposing the light sensitive planographic printing plate material to ultraviolet laser, and removing an image formation layer at non-exposed portions with an aqueous alkali solution to form an image.
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