摘要:
Both single-layer and multilayer imageable elements have a substrate and at least one imageable layer. The elements can be used to prepare either negative- or positive-working imaged elements, for example as lithographic printing plates. The imageable elements also include a radiation absorbing compound and a solvent-resistant polymer comprising pendant phosphoric acid groups, pendant adamantyl groups, or both. When this polymer comprises pendant adamantyl groups, they are connected to the polymer backbone through a urea or urethane group. The imageable elements have improved chemical resistance and thermal bakeability from the presence of the unique solvent-resistant polymer.
摘要:
Both single-layer and multilayer imageable elements have a substrate and at least one imageable layer. The elements can be used to prepare either negative- or positive-working imaged elements, for example as lithographic printing plates. The imageable elements also include a radiation absorbing compound and a solvent-resistant polymer comprising pendant phosphoric acid groups, pendant adamantyl groups, or both. When this polymer comprises pendant adamantyl groups, they are connected to the polymer backbone through a urea or urethane group. The imageable elements have improved chemical resistance and thermal bakeability from the presence of the unique solvent-resistant polymer.
摘要:
Multilayer, thermally imageable elements useful as lithographic printing plate precursors are disclosed. The imageable elements comprise a substrate, an underlayer over the substrate, an underlayer over the substrate, and a top layer over the underlayer. The top layer contains a co-polymer that alkylene glycol side chains, polyalkylene glycol side chains, side chains that have silyl groups substituted with three alkoxy and/or phenoxy groups, and/or side chains that have alkyl ammonium side chains. The imageable elements have excellent resistance to press room chemicals.
摘要:
Multilayer, thermally imageable elements useful as lithographic printing plate precursors are disclosed. The imageable elements comprise a substrate, an underlayer over the substrate, an underlayer over the substrate, and a top layer over the underlayer. The top layer contains a co-polymer that alkylene glycol side chains, polyalkylene glycol side chains, side chains that have silyl groups substituted with three alkoxy and/or phenoxy groups, and/or side chains that have alkyl ammonium side chains. The imageable elements have excellent resistance to press room chemicals.
摘要:
The present invention provides a thermally sensitive composition that may be coated as a water-borne material onto a substrate to yield a printing plate precursor having an imageable coating. The thermally sensitive composition comprises a sulfated phenolic resin. The sulfated phenolic resin may be a sulfated novolak resin or a sulfated resole resin, for example. The thermally sensitive composition may include a water-soluble binder, such as polyvinyl pyrrolidone, and a radiation-absorbing component. The invention also provides a printing plate precursor that is developed in water after imaging. The precursor does not require chemical development with a developing solution containing organic solvents or inorganic additives. The imaged precursor is on-press-developable when used with a fountain solution. Methods for making and using the precursor are also provided.
摘要:
Negative-working imageable elements have an imageable layer comprising a free radically polymerizable component, an initiator composition capable of generating radicals sufficient to initiate polymerization of the free radically polymerizable component upon exposure to imaging radiation, a radiation absorbing compound, one or more polymeric binders, and at least 5 weight % of core-shell particles comprising a hydrophobic polymeric core and a hydrophilic polymeric shell that is covalently bound to the polymeric core. The hydrophilic polymeric shell has one or more zwitterionic functional groups. These elements can be imaged such as by IR lasers to provide lithographic printing plates.
摘要:
The present invention provides a thermally sensitive composition that may be coated as a water-borne material onto a substrate to yield a printing plate precursor having an imageable coating. The thermally sensitive composition comprises a sulfated phenolic resin. The sulfated phenolic resin may be a sulfated novolak resin or a sulfated resole resin, for example. The thermally sensitive composition may include a water-soluble binder, such as polyvinyl pyrrolidone, and a radiation-absorbing component. The invention also provides a printing plate precursor that is developed in water after imaging. The precursor does not require chemical development with a developing solution containing organic solvents or inorganic additives. The imaged precursor is on-press-developable when used with a fountain solution. Methods for making and using the precursor are also provided.
摘要:
Negative-working imageable elements have an imageable layer comprising a free radically polymerizable component, an initiator composition capable of generating radicals sufficient to initiate polymerization of the free radically polymerizable component upon exposure to imaging radiation, a radiation absorbing compound, one or more polymeric binders, and at least 5 weight % of core-shell particles comprising a hydrophobic polymeric core and a hydrophilic polymeric shell that is covalently bound to the polymeric core. The hydrophilic polymeric shell has one or more zwitterionic functional groups. These elements can be imaged such as by IR lasers to provide lithographic printing plates.
摘要:
Thermally imageable, positive working, multilayer imageable elements useful as lithographic printing plate precursors are disclosed. The elements comprise a substrate; an underlayer over the substrate; a top layer over the underlayer, and a photothermal conversion material. The top layer comprises a binder and an ionic liquid. A preferred binder is poly(methyl methacrylate).
摘要:
Alkali soluble copolymers, imageable elements useful as lithographic printing plate precursors that contain the alkali soluble copolymers, and methods for forming images using the imageable elements are disclosed. The alkali soluble copolymers comprise, in polymerized form: (a) N-phenylmaleimide, N-cyclohexylmaleimide, N-benzylmaleimide, or a mixture thereof; (b) acrylamide, methacrylamide, or a mixture thereof; (c) acrylonitrile, methacrylonitrile, or a mixture thereof; and (d) one or more monomers selected from the group consisting of monomers of the structure: CH2═C(R)-Z-X—NHC(O)NH—Y—R′, in which: X is —[C(CH3)2]— or —[(CH2)n]—, in which n is 0 to 12; Y is o-, m-, or p-—[C6H4]—; Z is —[C(O)O]—, —[C(O)NH]—, or o-, m-, or p-[—C6H4]—; R is hydrogen or C1 to C4 alkyl; R′ is —OC(O)—OR″, —OC(O)—Ar, or —OSO2—Ar; R″ is C1 to C12 alkyl, C1 to C12 arylalkyl, C1 to C12 aryl, C1 to C12 alkenyl, or trimethylsilyl; Ar is C6H5-n′Tn′, in which Ar has a total of six to ten carbon atoms; each T is independently selected from the group consisting of C1 to C4 alkyl, fluoro, chloro, bromo, iodo, trifluoromethyl, methoxy, and cyano; and n′ is an integer from 0 to 5; and in which the copolymer is soluble in alkaline solutions having a pH greater than at least about 11.