A positive-working lithographic printing plate precursor includes on a support having a hydrophilic surface or which is provided with a hydrophilic layer, a heat and/or light-sensitive coating including an infrared absorbing agent and a binder including a monomeric unit including an oxalylamide moiety and a monomeric unit including a solubility enhancing group.

Provided are a lithographic printing plate precursor including a hydrophilized aluminum support, and a water-soluble or water-dispersible negative type image recording layer provided on the aluminum support, in which an arithmetic average height Sa of a surface of an outermost layer on a side where the image recording layer is provided is in a range of 0.3 m to 20 m or in which Expression (1) and Expression (2) are satisfied in a case where a Bekk smoothness of a surface of an outermost layer on a side where the image recording layer is provided is set as a seconds and a Bekk smoothness of a surface of an outermost layer on a side opposite to a side where the image recording layer is provided is set as b seconds; a method of producing the same; a lithographic printing plate precursor laminate formed of the lithographic printing plate precursor; a plate-making method for a lithographic printing plate; and a lithographic printing method.

a1000, b1000(1)

1/a+1/b0.002(2)

Provided are a lithographic printing plate precursor having a support, an image recording layer, and an overcoat layer in this order, in which the overcoat layer includes a water-soluble polymer and particles, a melting point of the particles is in a range of 70 C. to 150 C., and a volume average particle diameter of the particles is greater than 0.7 m and a method of producing a lithographic printing plate obtained by using the lithographic printing plate precursor.

Provided are a lithographic printing plate precursor including: a hydrophilized aluminum support, and a water-soluble or water-dispersible negative type image recording layer provided on the aluminum support, in which an arithmetic average height Sa of a surface of an outermost layer on a side opposite to a side where the image recording layer is provided is in a range of 0.3 m to 20 m; a method of producing the lithographic printing plate precursor; a lithographic printing plate precursor laminate formed of the lithographic printing plate precursor; and a lithographic printing method.

Provided are a printing plate precursor including a support, a layer containing a polymer on a printing surface side on the support, and a layer containing tabular particles on a non-printing surface side opposite to the layer containing a polymer in a state of sandwiching the support therebetween, and a printing plate precursor laminate which is obtained by laminating a plurality of the printing plate precursors, wherein the printing plate precursor laminate is formed such that an outermost layer on a surface where the layer containing the polymer is provided and an outermost layer on a surface where the layer containing the tabular particles is provided are laminated by being brought into direct contact with each other.

Provided are an on-machine development-type lithographic printing plate precursor including: an image-recording layer on an aluminum support having an anode oxide film, in which an end portion of the lithographic printing plate precursor has a shear droop shape, the image-recording layer contains a compound having a support adsorptive property, having a molecular weight of 1,000 or less, and not having an unsaturated double bond group in a molecule, and a content of the compound is substantially the same in a plane of the image-recording layer and a method for producing a lithographic printing plate in which the lithographic printing plate precursor is used.

Provided are a lithographic printing plate precursor including an image recording layer on a support, in which the lithographic printing plate precursor has projections which are discontinuously formed on a surface of an outermost layer on a side where the image recording layer is provided, and a melting point of each projection is in a range of 70 C. to 150 C.; and a method of producing a lithographic printing plate obtained by using the lithographic printing plate precursor.

It is preferable that the method of producing a lithographic printing plate includes a step of image-wise exposing the lithographic printing plate precursor to form an exposed portion and an unexposed portion, and a step of supplying at least one of printing ink or dampening water to remove the unexposed portion.

A lithographic printing plate precursor, comprising a layer arrangement according to any one of the following (i) to (iv): (i) a support and an image recording layer; (ii) a support, an undercoat layer, and an image recording layer; (iii) a support, an image recording layer, and a protective layer; or (iv) a support, an undercoat layer, an image recording layer, and a protective layer, wherein: a layer containing a hydrophilic agent is included in the layer arrangement between the support and an innermost layer, between adjacent layers, or on an outermost layer other than the protective layer, the layer containing a hydrophilic agent contacts a region of at least one of, but not all of, the support, the undercoat layer, the image recording layer, or the protective layer, and an amount of sag of an end portion of the lithographic printing plate precursor is from 30 m to 150 m.

Provided are a lithographic printing plate precursor having an image-recording layer on a hydrophilic support, in which the image-recording layer includes a. polymer having a constituent unit derived from a monomer having a solubility parameter of 20 MPa.sup.1/2 or more, an infrared absorber, and a polymer particle; a resin composition for producing a lithographic printing plate precursor including the polymer, an infrared absorber, and a polymer particle; and a method for producing a lithographic printing plate in which the lithographic printing plate precursor is used.

Provided is a lithographic printing plate precursor having a support and an image-recording layer on the support, in which the image-recording layer has an infrared absorber, a polymerization initiator, a polymerizable compound 1, a polymerizable compound 2, and a polymerizable compound 3, in which a molecular weight of the polymerizable compound 1 is less than 1,000, a weight-average molecular weight of the polymerizable compound 2 is 1,000 or more and 3,000 or less, and a weight-average molecular weight of the polymerizable compound 3 is more than 3,000 and 15,000 or less.