Planographic printing plate precursor, method of preparing planographic printing plate, and planographic printing method

A planographic printing plate precursor comprising:

• a support;
• and
• an image recording layer on the support,
• wherein the image recording layer contains an infrared absorbing agent, a polymerization initiator, and a core-shell particle,
• a core portion of the core-shell particle contains a resin A containing a functional group A,
• a shell portion of the core-shell particle contains a resin B containing a functional group B that is bondable to or interactable with the functional group A and a dispersion group,
• wherein the polymerization initiator includes an electron-donating polymerization initiator,
• wherein a difference between the highest occupied molecular orbital (HOMO) of the infrared absorbing agent and HOMO of the electron-donating polymerization initiator is 0.70 eV or less,
• wherein the resin B has a constitutional unit containing the functional group B and represented by the following Formula b-1 or Formula a1:
• in Formula b-1, X1b represents —O—, OH, NR3b, or NH2, L1b represents a divalent linking group having 1 to 20 carbon atoms, R1b represents a carboxy group, a hydroxy group, or a glycidyl group, R2b represents a hydrogen atom or a methyl group, and R3b represents a hydrogen atom, an alkyl group, or an aryl group, and in a case where X1b represents OH or NH2, L1b and R1b may not be present accordingly;
• in Formula a1, RA1 represents a hydrogen atom or an alkyl group, and
• wherein the resin B has a constitutional unit containing the dispersion group and represented by the following Formula b-3 or b-4:
• in formulae b-3 and b-4, L2 represents an ethylene group or a propylene group, L3 represents an alkylene group having 2 to 10 carbon atoms, L4 represents an alkylene group having 1 to 10 carbon atoms, R4 and R6 each independently represents a hydrogen atom, an alkyl group, or an aryl group, R5 and R7 each independently represents a hydrogen atom or a methyl group, m1 represents an integer of 2 to 200, and m2 represents an integer of 2 to 20.