Abstract:
A system, method, and computer program for for organizing elements for compression, comprising nesting a hierarchical topological structure having a plurality of elements; arranging said plurality of elements in a pattern to facilitate data compression; representing said pattern as four arrays; and compressing said plurality of elements from said arrays, and appropriate means and computer-readable instructions.
Abstract:
A positive-working imageable element comprises inner and outer layers and a radiation absorbing compound such as an IR absorbing dye. The inner layer includes a polymeric material that is removable using an alkaline developer. An ink receptive outer layer is not removable using an alkaline developer before its exposure to imaging radiation. The outer layer includes a polymer binder having pendant epoxy groups that are substantially unreacted during exposure.
Abstract:
A method for forming a printing plate from a printing plate precursor having a radiation-sensitive layer, sensitive to radiation in a first frequency region such as the far or near infrared, and to radiation in a second frequency region other than the first frequency region such as visible or ultraviolet. The plate is exposed twice. Once to imaging radiation in the first frequency region and again to radiation in the second frequency region. The second frequency region exposure is done only to the areas of the plate undesirably shaded during the imagewise exposure.
Abstract:
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: wherein Ar is a phenylene or naphthylene group, R 1 and R 2 are independently alkyl, alkenyl, alkynyl, phenyl, phenoxy, -R 5 OH, -CH 2 -C(=O)-R 3 , or -CH 2 -Q=O)O-R 4 groups, R 3 is hydrogen or an alkyl or phenyl group, R 4 is an alkyl or phenyl group, R 5 is an alkylene group, R 6 and R 7 are independently hydrogen or an alkyl, -R 5 OH, -R 5 C=O)-R 8 , or -R 5 C=O)OR 9 group, R 8 is hydrogen or an alkyl group, and R 9 is an alkyl group, provided that the oxygen scavenger has no more than one carboxyl group.
Abstract:
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.
Abstract:
Multilayer thermally imageable elements useful as lithographic printing plate precursors are disclosed. The imageable elements comprise a substrate, an underlayer over the substrate, and a top layer over the underlayer. The top layer contains a polymer containing anhydride groups. This polymer is present in the top layer in an amount of at least 60% based on the dry weight of the layer. The imageable elements have excellent resistance to press room chemicals.
Abstract:
A system, method, and computer program product that accepts raw polygon geometry and view parameters from the visualization API, sorts the polygons in back-to-front order, and then supplies the sorted triangles to graphics API such as OpenGL.
Abstract:
A method for forming images useful as lithographic printing plate precursors is disclosed. An imageable element in which the imageable layer comprises an acid generator, a crosslinking agent, and a binder is imaged with ultraviolet radiation and developed with a solvent based developer. The acid generator is an iodonium, sulfonium, or diazonium salt in which the anion is an organic sulfate or thiosulfate anion. The binder comprises a copolymer that contains a reactive pendent group capable of undergoing acid crosslinking, in which the reactive pendent group is hydroxyl, carboxylic acid, sulfonamide, alkoxymethyl, or a mixture thereof. The method is especially suited for use with direct digital ultraviolet imaging devices. The resulting image is useful as a lithographic printing plate.
Abstract:
The present invention provides a radiation sensitive composition suitable for us in on-press developable printing plates. The radiation sensitive composition comprises an initiator system including an onium salt and a radiation absorber. The initiator system is combined with a polymerizable material, and a polymeric binder including polyethylene oxide segments.
Abstract:
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 3 to 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.