The present invention relates to a printing plate including a first silicone layer and a second silicone layer which have different ink acceptabilities on a support. An object of the present invention is to provide a printing plate that dispenses with a development step and that has excellent image reproducibility, ink repellency, ink acceptability, and printing durability.

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 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.

The present invention provides a lithographic printing plate precursor including at least a heat-sensitive layer and an ink repellent layer disposed on a substrate, the rate of gas generation therefrom being 6.510.sup.5 g/m.sup.3 to 12.510.sup.5 g/m.sup.3 as determined by GC-MS analysis in which the lithographic printing plate precursor is heated in a nitrogen stream at 450 C. for 5 minutes, and also provides a method for producing a lithographic printing plate and a method for producing printed matter therefrom.

The present invention provides a lithographic printing plate precursor including at least a heat-sensitive layer and an ink repellent layer disposed on a substrate, the rate of gas generation therefrom being 6.510.sup.5 g/m.sup.3 to 12.510.sup.5 g/m.sup.3 as determined by GC-MS analysis in which the lithographic printing plate precursor is heated in a nitrogen stream at 450 C. for 5 minutes, and also provides a method for producing a lithographic printing plate and a method for producing printed matter therefrom.

Provided are a planographic printing plate precursor and a method of producing a planographic printing plate precursor, in which an image forming region during printing on newspaper page is ensured and edge stains are eliminated. Provided are a planographic printing plate precursor (10b) including an aluminum support (12) which has an anodized film (14), and an image recording layer (16) on the aluminum support (12), in which an end portion of the planographic printing plate precursor (10b) has a sagging shape having a sagging amount (X) of 25 m to 150 m and a sagging width (Y) of 70 m to 300 m, the image recording layer (16) contains an infrared absorbing agent, and a part or an entire side surface of two sides of the aluminum support (12), the two sides having the sagging shape and opposing each other contains an ink repellent agent (44); and a method of producing the planographic printing plate precursor (10b).

Provided are a planographic printing plate precursor and a method of producing a planographic printing plate precursor, in which an image forming region during printing on newspaper page is ensured and edge stains are eliminated. Provided are a planographic printing plate precursor (10b) including an aluminum support (12) which has an anodized film (14), and an image recording layer (16) on the aluminum support (12), in which an end portion of the planographic printing plate precursor (10b) has a sagging shape having a sagging amount (X) of 25 m to 150 m and a sagging width (Y) of 70 m to 300 m, the image recording layer (16) contains an infrared absorbing agent, and a part or an entire side surface of two sides of the aluminum support (12), the two sides having the sagging shape and opposing each other contains an ink repellent agent (44); and a method of producing the planographic printing plate precursor (10b).

Provided is a precursor for lithographic printing having excellent printing durability and ink repellency as well as high reproducibility of the high definition images. The precursor for lithographic printing includes, at least a heat sensitive layer and an ink repellent layer wherein the ink repellent layer has an elastic modulus of the plate surface under the surface load of 14000 N/m2 of at least 25 MPa and up to 35 MPa.

Provided is a precursor for lithographic printing having excellent printing durability and ink repellency as well as high reproducibility of the high definition images. The precursor for lithographic printing includes, at least a heat sensitive layer and an ink repellent layer wherein the ink repellent layer has an elastic modulus of the plate surface under the surface load of 14000 N/m2 of at least 25 MPa and up to 35 MPa.

Provided are a planographic printing plate precursor including a support and an image recording layer formed on the support, in which the image recording layer contains a polymer A which includes a constitutional unit A1 having an ethylenically unsaturated group, a weight-average molecular weight of the polymer A is in a range of 2,500 to 35,000, and a content of the constitutional unit A1 in the polymer A is 15 mol % or more, and a method of producing a planographic printing plate using the planographic printing plate precursor.