Patent ID: 7192683

Claim:
A planographic printing plate precursor comprising: a support; and a hydrophilic layer disposed on or over the support and including a hydrophilic graft chain and a crosslinked structure formed by at least one of hydrolyzing or polycondensing an alkoxide of an element selected from Si, Ti, Zr and Al, wherein the hydrophilic layer includes a photothermal conversion agent (A) and a compound (B) comprising water-dispersible particles capable of forming a hydrophobic surface area by being at least one of heated or irradiated with radiation and which are made of a hydrophobic polymer having a structural unit including an organic silicon group represented by the following formula (6): wherein R 1 , R 2 , R 3 and R 4 each independently represent a hydrogen atom or a hydrocarbon group having 1 to 8 carbon atoms, m is 0, 1 or 2, Z represents a group selected from the following: wherein R 9 represents a hydrocarbon group having 1 to 8 carbon atoms, R 10 represents an alkylene group having 5 or less carbon atoms, or a bivalent organic residue in which a plurality of chain-like carbon atom groups are bonded to each other through a carbon atom or a nitrogen atom, and n is an integer of 0 to 4, and the photothermal conversion agent (A) is not present in a manner integral with the compound (B), which would result from adding the agent (A) to the compound (B) when the compound (B) is produced, but is present in a manner independent of the compound (B) and dispersed in the hydrophilic layer.