Abstract:
A lithographic printing plate precursor capable of forming an image without alkali development, comprising a hydrophilic support and a laser-sensitive photopolymerizable layer, wherein the photopolymerizable layer or other layer included in the lithographic printing plate precursor contains a copolymer containing at least a repeating unit having at least one ethylenically unsaturated bond and a repeating unit having at least two functional groups capable of interacting with a surface of the support or a copolymer containing at least a repeating unit having at least two ethylenically unsaturated bonds and a repeating unit having at least one functional group capable of interacting with a surface of the support.
Abstract:
The present invention provides a polymerizable composition comprising (A) a compound including a polymerizable unsaturated group and (B) a macromolecular compound including, at a side chain thereof, a structure represented by the following general formula (I). The present invention also provides a negative type planographic printing plate precursor responsive to an infrared laser, the precursor being superior in recording sensitivity and printing durability and using the polymerizable compound as a recording layer.General Formula (I) Z−M+ wherein Z− represents COCOO−, COO−, SO3− or SO2—N−—R where R represents a monovalent organic group and M30 represents an onium cation.
Abstract:
A lithographic printing method comprising: (i) a process of one of (i-1) imagewise exposing a lithographic printing plate precursor comprising a support and an image-recording layer capable of being removed with at least one of a fountain solution and a printing ink, and mounting the exposed printing plate precursor on a plate cylinder of a printing press; and (i-2) mounting the lithographic printing plate precursor on a plate cylinder of a printing press and imagewise exposing the lithographic printing plate precursor; (ii) a process of removing an unexposed area of the image-recording layer by directly supplying a fountain solution on the exposed lithographic printing plate precursor with a water application roller of the printing press; and (iii) a process of printing, wherein the printing press comprises a water supply apparatus including a water application roller and at least one roller in contact with the water application roller, at least one of said at least one roller being an oscillating roller.
Abstract:
A planographic printing plate precursor comprises a substrate having disposed thereon a hydrophilic layer which includes hydrophilic graft chains and a crosslinked structure formed through hydrolytic polycondensation of an alkoxide of an element selected from Si, Ti, Zr and Al. An aluminum substrate for a planographic printing plate includes a hydrophilic surface which is formed by a hydrophilic polymer including a functional group that chemically bonds to the aluminum substrate directly or is chemically bindable to the aluminum substrate via structural component having a crosslinking structure. A surface-hydrophilic member comprises a substrate having disposed thereon a hydrophilic layer, wherein the hydrophilic layer includes hydrophilic graft chains and a crosslinked structure formed through hydrolytic polycondensation of an alkoxide of an element selected from Si, Ti, Zr and Al.
Abstract:
The invention provides a hydrophilic member precursor having a hydrophilic surface that is formed by contacting a hydrophobic polymer-containing layer formed on a substrate with a composition that contains a polymerizing group-having hydrophilic polymer followed by applying energy thereto to thereby directly chemically bond the polymerizing group-having hydrophilic polymer to the hydrophobic polymer-containing layer. The invention also provides a hydrophilic member from the hydrophilic member precursor, as well as a pattern forming material, a support for planographic printing plates, and a planographic printing plate precursor.
Abstract:
Disclosed is a printing method comprising the steps of mounting an underlay sheet on a plate cylinder of a printing press, and providing, on the underlay sheet, a printing plate material comprising a plastic sheet support, and provided thereon, a hydrophilic layer, an image formation layer and a backing layer, the backing layer being provided on the side of the support opposite the image formation layer, so that the backing layer side surface of the printing plate material contacts the underlay sheet surface, wherein a coefficient of dynamic friction of the backing layer side surface of the printing plate material to the underlay sheet surface is from 0.1 to 0.5.
Abstract:
A polymerizable lithographic printing plate precursor comprising a support having in order thereon, a polymerizable photosensitive layer and a protective layer containing (A) polyvinyl alcohol and (B) a polyoxyethylene castor oil ether surfactant.
Abstract:
A method for producing a lithographic printing plate is provided, wherein, in the non-alkaline development of a lithographic printing plate precursor having a protective layer, even if the protective layer components are mingled into the developer, the reduction in development removability of the image recording layer and the generation of development scum can be inhibited; an on-press development type lithographic printing plate precursor with excellent inking property, high scratch resistance, satisfied on-press developability and good fine line reproducibility is provided; and a lithographic printing method is provided, each of which is a method for producing a lithographic printing plate, comprising: imagewise exposing a lithographic printing plate precursor comprising a support, an image recording layer and a protective layer, and rubbing the plate surface by a rubbing member of an automatic processor in the presence of a developer at a pH of 2 to 10 to remove the protective layer and the image recording layer in the unexposed area; a lithographic printing plate precursor comprising a support, an image recording layer removable with a printing ink and/or a fountain solution, and a protective layer containing a polyvinyl alcohol having a carboxyl group and/or a sulfonic acid group within the molecule; and a lithographic printing method comprising on-press development.
Abstract:
A color image-forming material capable of drawing an image by infrared laser exposure and excellent in image visibility, storage stability and white light stability, and an on-press development or non-processing (non-development) type lithographic printing plate precursor ensuring high sensitivity and high press life and being excellent in image visibility, on-press developability and the like, are provided, which are a color image-forming material comprising an image recording layer capable of drawing an image by infrared laser exposure, the color image-forming material forming a color image without passing through a development processing step after image recording, wherein the image recording layer comprises (A) an infrared absorbent, (B) a cyclic color-forming compound having a cyclic structure within the molecule and forming a dye by a ring opening, and (C) a dye stabilizer which is a compound interacting with the cyclic color-forming compound to stabilize the ring-opened dye body and cause color formation and which is released from the interaction upon laser exposure to decrease in the color formation; and a lithographic printing plate precursor using this color image-forming material.
Abstract:
A method for making a heat-sensitive negative-working lithographic printing plate precursor is disclosed comprising the steps of (i) preparing a coating solution comprising hydrophobic thermoplastic polymer particles and a hydrophilic binder; (ii) applying said coating solution on a support having a hydrophilic surface or which is provided with a hydrophilic layer, thereby obtaining an image-recording layer; (iii) drying said image-recording layer; characterized in that said hydrophobic thermoplastic polymer particles have an average particle size in the range from 45 nm to 63 nm, and that the amount of said hydrophobic thermoplastic polymer particles in the image-recording layer is at least 70% by weight relative to the dried image-recording layer.