Fujifilm Corporation

Yusuke Namba

Akinori Fujita

Kazuaki Enomoto

Akira Yamamoto

Ichiro Koyama

Natsumi Yokokawa

Akio Uesugi

Hirokazu Sawada

Hiroshi Tashiro

Atsushi Matsuura

Seiichiro Morikawa

Mitsuhiro Fujita

Yusuke Ikeyama

Atsushi Oshima

Akira Sakaguchi

Masato Shirakawa

Keio Okano

Keisuke Nogoshi

Taira Murakami

Shinya Kurokawa

Nobuyuki Sone

Yuki Sakamoto

A lithographic printing plate precursor has a support and an image-recording layer on the support, in which the image-recording layer contains an infrared absorber, a polymerization initiator, and a polymer A. The weight-average molecular weight of the polymer A is more than 15,000 and 150,000 or less, and the ethylenically unsaturated bond valence of the polymer A is 3.0 mmol/g or more.

Lithographic printing plate precursor, method for preparing lithographic printing plate, and lithographic printing method

An on-press development type lithographic printing plate precursor has a support, an image-recording layer, and an outermost layer in this order. The image-recording layer contains an infrared absorber, an electron-accepting polymerization initiator, and a polymerizable compound. LUMO of the electron-accepting polymerization initiator-LUMO of the infrared absorber is 0.45 eV or more, and the outermost layer contains a discoloring compound. A method of preparing a lithographic printing plate and a lithographic printing method employ the on-press development type lithographic printing plate precursor.

On-press development type lithographic printing plate precursor,method of preparing lithographic printing plate, and lithographic printing method

An on-machine development type planographic printing plate precursor has a support and an image-recording layer on the support. The image-recording layer contains an initiator, an infrared absorber capable of donating electrons to the initiator, and a color-developing substance precursor. The image-recording layer can form an image by exposure to infrared laser, and in a case where the image-recording layer is exposed to an infrared laser with a wavelength of 830 nm at an energy density of 110 mJ/cm, a brightness change ΔL of the image-recording layer before and after the exposure is 3.0 or more. A method for preparing a planographic printing plate and a planographic printing method employ the on-machine development type planographic printing plate precursor.

On-machine development type planographic printing plate precursor, method for preparing planographic printing plate, and planographic printing method

An on-press development type lithographic printing plate precursor having a support and an image-recording layer on the support, in which the image-recording layer contains an infrared absorber, a polymerization initiator, a polymerizable compound, and a color-developing substance precursor, and in a case where the image-recording layer is exposed to an infrared laser having a wavelength of 830 nm at an energy density of 110 mJ/cm, a loss of ethylenically unsaturated bonds in an exposed area in the image-recording layer is 10% to 40% of ethylenically unsaturated bonds in a non-exposed area in the image-recording layer, and a method for preparing a lithographic printing plate or a lithographic printing method using the on-press development type lithographic printing plate precursor.

On-press development type lithographic printing plate precursor, method for preparing lithographic printing plate, and lithographic printing method

A lithographic printing plate precursor has a support and an image-recording layer on the support. The image-recording layer contains an infrared absorber, a polymer A that has a weight-average molecular weight of more than 15,000 and 150,000 or less, and a polymerizable compound B that has a weight-average molecular weight of 1,000 or more and 15,000 or less, and the polymer A is a polymer represented by Formula (I):A-(B)  Formula (I) In Formula (I), Arepresents an nP-valent organic group having a hydrogen bonding group, Brepresents a group having 2 or more Polymerizable groups, nP represents an integer of 2 or more, and weight-average molecular weight of A/(molecular weight of B×nP) is 1 or less.

An aqueous developer for a flexographic printing plate capable of maintaining good developability and suppressing aggregation of a dispersion in the developer diluted with water after repeated use, and a manufacturing method of a flexographic printing plate using the same, are provided. The aqueous developer for a flexographic printing plate contains a surfactant represented by Formula (1), and water:

Aqueous developer for flexographic printing plate and manufacturing method of flexographic printing plate

An on-machine development lithographic printing plate precursor includes an image-recording layer on an aluminum support having an anode oxide film, wherein 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.

On-machine development-type lithographic printing plate precursor and method for producing lithographic printing plate

Provided is to provide a cylindrical printing plate with which printing of excellent solid density and high halftone dot quality is made possible, and further print medium followability and printing durability are excellent, a cylindrical printing plate precursor, a method for manufacturing a cylindrical printing plate precursor, and a method for manufacturing a cylindrical printing plate. A cylindrical printing plate includes a relief layer having a first hard layer, a soft layer, and a second hard layer in this order from a printing surface side, in which a hardness Kof the first hard layer is 10 MPa or more and less than 20 MPa, a ratio K/Kof the hardness Kof the first hard layer with respect to a hardness Kof the soft layer is 2.7 or more, a ratio K/Kof a hardness Kof the second hard layer with respect to the hardness Kof the soft layer is 1.2 or more, a thickness of the first hard layer is 0.05 mm or more and 0.3 mm or less, and a thickness of the soft layer is 0.3 mm or more and 2.0 mm or less.

Cylindrical printing plate, cylindrical printing plate precursor, method for manufacturing cylindrical printing plate precursor, and method for manufacturing cylindrical printing plate

The present invention is to provide a flexographic printing plate having excellent ink uniformity in an image area, particularly, in a solid portion regardless of a printing speed, a method for manufacturing the flexographic printing plate, and a flexographic printing plate precursor used in the manufacturing of the flexographic printing plate. The flexographic printing plate of the present invention is a flexographic printing plate having a relief layer provided with a non-image area, and an image area having an uneven structure formed on the surface, in which a concave portion constituting the uneven structure is formed of at least one of a plurality of grooves having a fixed width extending in one direction or a plurality of hole groups constituted of a plurality of bottomed holes having the same diameter scattered in the one direction, a depth of the concave portion is 2 to 20 &#x3bc;m, each of the plurality of grooves and the plurality of hole groups is arranged in an orthogonal direction orthogonal to the one direction, and the grooves and the bottomed holes respectively have two or more kinds of widths and diameters.

Flexographic printing plate, method for manufacturing flexographic printing plate, and flexographic printing plate precursor

An object of the present invention is to provide a flexographic printing plate having excellent ink transferability in a solid portion and the like and having good printing quality in a halftone portion. The flexographic printing plate of the present invention is a flexographic printing plate having a relief layer including a non-image area and an image area, in which the image area has a halftone dot portion having a halftone dot area ratio of more than 0% and less than 100%, and a solid portion having a halftone dot area ratio of 100%, small dots in the halftone dot portion and the solid portion or small dots in the halftone dot portion have two or more recessed portions having different depths according to a halftone dot area ratio, and the two or more recessed portions having different depths are recessed portions whose depth becomes deeper as the halftone dot area ratio increases.

Flexographic printing plate

A presensitized plate bringing about the lithographic printing plate which exhibits a high resistance to scumming and in which formation of bulges causing image dropouts is suppressed is provided with the lithographic printing plate support which includes an aluminum plate and an anodized film of aluminum provided on the aluminum plate, and has a micropore extending in the anodized film in the direction of depth from a film surface opposite with a film surface facing the aluminum plate. The micropore is sealed at least partially on its inside with protrusions made of boehmite, and the protrusions made of boehmite which are located on the anodized film have a mean height of less than 15 nm.

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Shizuoka, Japan

Yusuke Namba