Patent application number | Description | Published |
20080241754 | POLYONIUM BORATES AND RADIATION-SENSITIVE COMPOSITION AND IMAGEABLE ELEMENTS CONTAINING SAME - A radiation-sensitive composition includes a free-radically polymerizable component, an initiator composition capable of generating free radicals sufficient to initiate polymerization upon exposure to imaging radiation, an infrared radiation absorbing compound, and a polymeric binder. The initiator composition includes a unique polyonium borate comprising a polyvalent onium cation with multiple onium moieties and sufficient organic borate counterions to provide a net neutral charge. The radiation-sensitive composition can be used to prepare a negative-working imageable element that is sensitive to suitable imaging infrared radiation, can be imaged at relatively low energy, and can be developed either on-press or off-press. | 10-02-2008 |
20090022961 | INTERLAYER FOR LITHOGRAPHIC PLATES - Lithographic substrate comprising (a) a dimensionally stable plate- or foil-shaped support, (b) an aluminum oxide layer provided on at least one side of the support (a), and (c) an interlayer applied onto the aluminum oxide layer comprising a hydrophilic polymer comprising structural units derived from the following compounds: (a1) at least one compound comprising both polyalkylene oxide chains and at least one structural unit which is free-radical polymerizable, and (a2) at least one monomer capable of copolymerizing with the free-radical polymerizable structural unit of (a1) and furthermore comprising at least one acidic functional group with pKs<5, wherein the acidic functional group can be present as a free acid group or in the form of a salt. | 01-22-2009 |
20090047599 | NEGATIVE-WORKING IMAGEABLE ELEMENTS AND METHODS OF USE - A negative-working imageable element has an imageable layer that includes an initiator composition including an iodonium cation and a boron-containing anion at a molar ratio of at least 1.2:1, an infrared radiation absorbing compound, a primary polymeric binder, and a spirolactone or spirolactam colorant precursor. The imaged element exhibits improved print-out. | 02-19-2009 |
20090253069 | IMAGEABLE ELEMENTS USEFUL FOR WATERLESS PRINTING - A non-ablative negative-working imageable element has first and second polymeric layers under a crosslinked silicone rubber layer. These elements can be used in a simple method to provide lithographic printing plates useful for waterless printing (no fountain solution). Processing after imaging is relatively simple using either water or an aqueous solution containing very little organic solvent to remove the imaged regions. The crosslinked silicone rubber layer is ink-repelling and only the first layer that is closest to the substrate contains an infrared radiation absorbing compound to provide thermal sensitivity. | 10-08-2009 |
20090305162 | IMAGEABLE ELEMENTS AND METHODS USEFUL FOR PROVIDING WATERLESS PRINTING PLATES - An imageable element can be imaged using non-ablative processes. This element has a non-silicone, non-crosslinked layer contiguous to and under an ink-repelling crosslinked silicone rubber layer. These elements can be used for providing lithographic printing plates useful for waterless printing (no fountain solution). Processing after imaging is relatively simple with either water or an aqueous solution consisting essentially of a surfactant or mechanical means to remove the crosslinked silicone rubber layer and a minor portion of the non-silicone, non-crosslinked layer in the imaged regions. | 12-10-2009 |
20100009130 | ON-PRESS DEVELOPABLE IMAGEABLE ELEMENTS - A negative-working imageable element has an imageable layer and a topcoat layer that contains a composition that will change color upon exposure to imaging infrared radiation. The imageable element can be imaged and developed on-press to provide images with improved contrast for print-out. | 01-14-2010 |
20100015549 | ON-PRESS DEVELOPABLE NEGATIVE-WORKING IMAGEABLE ELEMENTS - The present invention relates to negative-working imageable elements that can be used for the manufacture of printing plates. These imageable elements can be developed on on-press by the action of a lithographic printing ink used in combination with either water or a fountain solution. The imageable elements comprise an imageable layer that is not removable in water or fountain solution alone. The imageable layer includes a free radically polymerizable compound, a free radical initiator composition, an infrared radiation absorbing compound, and a polymeric binder comprising poly(alkylene oxide) pendant groups, and preferably additionally pendant cyano groups. | 01-21-2010 |
20100316956 | PREPARING LITHOGRAPHIC PRINTING PLATES WITH ENHANCED CONTRAST - Lithographic printing plates can be prepared with enhanced contrast between the image and background by coloring the imaged or exposed regions using a coloring fluid containing a water-insoluble colorant (dye or pigment) and an organic solvent that swells the imaged regions sufficiently for the colorant to be embedded or diffused therein. | 12-16-2010 |
20110053085 | LITHOGRAPHIC PRINTING PLATE PRECURSORS AND STACKS - Lithographic printing plate precursors have been designed so that they can be stored, shipped, and used in stacks without interleaf paper between individual precursors. This is achieved by incorporating polymeric particles having an average diameter of from about 3 to about 20 μm into the outermost precursor layer such as an imageable layer or topcoat. The polymeric particles comprise a core of a crosslinked polymer and have grafted hydrophilic polymeric surface groups that are grafted onto the particle surfaces by polymerizing hydrophilic monomers in the presence of the crosslinked polymeric particles. The lithographic printing plates can be either negative- or positive-working elements. | 03-03-2011 |
20110104450 | NEGATIVE-WORKING LITHOGRAPHIC PRINTING PLATE PRECURSORS - A negative-working lithographic printing plate precursor have an outermost imageable layer that includes an oxygen scavenger and shelf-life stabilizer that is represented by either Structure (I) or Structure (II) below: | 05-05-2011 |
20120015295 | INFRARED-SENSITIVE COMPOSITION FOR PRINTING PLATE PRECURSORS - A lithographic printing plate precursor has a substrate and an infrared radiation-sensitive composition comprising a polymeric binder, a free radical polymerizable system consisting of at least one polymerizable component, a compound capable of absorbing infrared radiation, and an initiator system comprising an iodonium salt that is capable of producing free radicals; and at least 1% and up to and including 10% by weight, based on the infrared-sensitive composition, of at least one mono- or polycarboxylic acid having an aromatic moiety. | 01-19-2012 |
20120125216 | METHODS OF PROCESSING USING SILICATE-FREE DEVELOPER COMPOSITIONS - A method is used to prepare lithographic printing plates by developing positive-working lithographic printing plate precursor that has a single imageable layer that comprises a polymer binder having recurring units represented by Structure (Ib) below: | 05-24-2012 |
20120141942 | METHOD OF PREPARING LITHOGRAPHIC PRINTING PLATES - Lithographic printing plates are prepared by imaging and developing negative-working lithographic printing plate precursors that include certain particulate polymeric binders in the photosensitive imageable layer. Such particulate polymeric binders are poly(urethane-acrylic) hybrids. Development is carried out using a working strength developer that includes one or more organic solvents in a total amount of at least 7 weight % and an anionic surfactant in an amount of at least 5 weight %. | 06-07-2012 |