Fujifilm Corporation

Keisuke Nogoshi

Takeshi Inasaki

Kazuaki Enomoto

Akio Mizuno

Yohei Ishiji

Akira Yamamoto

Hiroaki Idei

Yusuke Namba

Taira Murakami

Akira Sakaguchi

Kyosuke Tsumura

Yuuya Miyagawa

Kohei Aizu

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-press development type lithographic printing plate precursor has an aluminum support and an image-recording layer on the aluminum support, in which the image-recording layer contains an infrared-absorbing polymethine colorant having HOMO of −5.2 eV or less, a polymerization initiator, and a polymerizable compound having 7 or more polymerizable functional groups and contains or does not contain a polymer having a molecular weight 10,000 or more. In a case where the image-recording layer contains the polymer having a molecular weight of 10,000 or more, a ratio Wp/Wm of a content Wp of the polymer having a molecular weight of 10,000 or more to a content Wm of the polymerizable compound having 7 or more polymerizable functional groups is 1.00 or less.

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

A lithographic printing plate precursor has an image-recording layer on a hydrophilic support, in which the image-recording layer contains an infrared absorbing dye that decomposes by exposure to an infrared ray and a color developer that develops color due to the exposure to an infrared ray. A method for producing a lithographic printing plate includes image-exposing the lithographic printing plate precursor using an infrared laser.

Lithographic printing plate precursor and method for producing lithographic printing plate

A curable composition includes a salt compound having a) an organic anion in which, in Hansen solubility parameter, &#x3b4;d is 16 or more, &#x3b4;p is 16 or more and 32 or less, and &#x3b4;H is 60% or less of &#x3b4;p and b) a counter cation. A lithographic printing plate precursor having an image-recording layer containing the curable composition, a method for producing a lithographic printing plate using the lithographic printing plate precursor, and a compound that is used in the image-recording layer in the lithographic printing plate precursor are also set out.

Curable composition, lithographic printing plate precursor, method for producing lithographic printing plate, and compound

A lithographic printing plate precursor including an image recording layer on a hydrophilic support, in which the image recording layer includes a polymerization initiator, an infrared absorbent, a polymerizable compound, and an acid color former, and the infrared absorbent includes a compound represented by Formula 1, as well as a method of preparing a lithographic printing plate by use of the lithographic printing plate precursor. In Formula 1, at least one of Aror Arhas a group represented by &#x2014;X, where X represents a halogen atom, &#x2014;C(&#x2550;O)&#x2014;X&#x2014;R, &#x2014;C(&#x2550;O)&#x2014;NRR, &#x2014;O&#x2014;C(&#x2550;O)&#x2014;R, &#x2014;CN, &#x2014;SONR, or a perfluoroalkyl group, Xrepresents a single bond or an oxygen atom, Rand Reach independently represents an alkyl group or an aryl group, and R, R, Rand Reach independently represents a hydrogen atom, an alkyl group, or an aryl group: 

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

A color developing composition containing a compound represented by the Formula (1) as defined herein, a lithographic printing plate precursor including a support and an image-recording layer containing the color developing composition, a method for producing a lithographic printing plate including: exposing the lithographic printing plate precursor in an image pattern; and removing a non-exposed portion in the image-recording layer using at least one of printing ink or dampening water on a printer, and a color developing compound represented by the Formula (1) as defined herein.

Color developing composition, lithographic printing plate precursor, method for producing lithographic printing plate, and color developing compound

A color developing composition which develops colors in a high density and does not significantly discolor when aged, a lithographic printing plate precursor which has excellent plate-inspecting properties by means of color development and is capable of maintaining strong color development even when aged after color development, a plate making method for a lithographic printing plate in which the lithographic printing plate precursor is used, and a new compound that can be preferably used as a color developer. The color developing composition of the present invention includes a compound represented by Formula 1. The compound in the present invention is represented by Formula 1. In Formula 1, Rrepresents a group in which an R&#x2014;O bond is cleaved by heat or exposure to infrared rays. 

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Shizuoka, Japan

Keisuke Nogoshi