Positive type planographic printing plate precursor and method of producing planographic printing plate

A positive type planographic printing plate precursor, comprising:

• a support which has a hydrophilic surface;
• and
• an image recording layer on the support,
• the image recording layer comprising:
• a polymer compound 1 comprising at least one bond selected from the group consisting of a urea bond, a urethane bond, and a carbonate bond in a main chain and comprising a sulfonamide group in the main chain;
• a polymer compound 2-1 comprising at least one selected from the group consisting of a constitutional unit represented by the following Formula S-1 and a constitutional unit represented by the following Formula S-2 or a polymer compound 2-2 comprising a constitutional unit represented by the following Formula EV-1 and a constitutional unit represented by the following Formula EV-2;
• and
• an infrared absorbent:
• wherein, in Formulae S-1 and S-2, RS1 represents a hydrogen atom or an alkyl group, Z represents —O— or —N(RS2), RS2 represents a hydrogen atom, an alkyl group, an alkenyl group, or an alkynyl group, each of Ar1 and Ar2 independently represents an aromatic group, at least one of Ar1 or Ar2 represents a heteroaromatic group, and each of sa and sb independently represents 0 or 1;
• and
• wherein, in Formulae EV-1 and EV-2, L represents a divalent linking group, X represents 0 or 1, R1 represents an aromatic ring containing at least one hydroxy group or heteroaromatic ring containing at least one hydroxy group, and each of R2 and R3 independently represents a hydrogen atom, a halogen atom, a linear, branched, or cyclic alkyl group which may have a substituent, a linear, branched, or cyclic alkenyl group which may have a substituent, an aromatic ring which may have a substituent, or a heteroaromatic ring which may have a substituent.