Abstract:
The present invention provides an imageable composition, which includes an acid curable composition, an acid generator, an infrared absorber, optionally a colorant, such as, a colorant dye or colorant pigment, wherein at least one of the infrared absorber and the colorant has a counter anion derived from a non-volatile acid, and further optionally, a strong acid. The present invention further provides an imageable element, which includes a substrate and an imageable composition according to the present invention coated on a surface of the substrate. Also provided is method of producing an imaged element according to the present invention.
Abstract:
A coating solution useful in the preparation of printing plate precursors comprises: a) a radiation sensitive composition C comprising a phenolic resin; b) at least one thermoplastic polymer P which has a solubility in aqueous alkaline media ranging from sparingly soluble to insoluble; c) a first solvent component A which is capable of solubilizing both composition C and thermoplastic polymer P; d) a second solvent component B having a volatility less than component A, wherein component B is capable of volatilizing composition C but not thermoplastic polymer P, and composition C and thermoplastic P are homogeneously dissolved in a mixture of components A and B; and e) at least one further polymer AP having a higher molecular weight than the phenolic resin of composition C, wherein polymer AB is miscible with the phenolic resin and immiscible with thermoplastic polymer P. The coating provides a radiation-sensitive layer for the substrate, and the coating contains homogeneously distributed thermoplastic polymer particles.
Abstract:
The present invention provides a photosensitive lithographic printing plate which displays superior ink receptivity and superior film strength of the photosensitive layer (image area). The photosensitive lithographic printing plate is produced by providing, on top of a support, a photosensitive composition comprising a fluororesin having a fluoro aliphatic group of 3 to 20 carbon atoms in which at least two of three terminal hydrogen atoms are substituted for fluorine atoms, and an ethylene based unsaturated group, as well as a negative photosensitive compound.
Abstract:
A novel fluorinated aromatic acetal polymer comprises at least one unit of A and at least one unit of B or C, or at least one unit of each of A, B and C and optionally further comprises at least one unit of either D or E or at least one unit of each of D and E, wherein the units A and B and/or C, and optionally D and/or E are linked together by single covalent C-C bonds and have the formulae: 1 wherein RA is H or C1-C11 alkyl, or an aryl group that does not contain fluorine, and RB and RC are an aryl groups that contain fluorine. The polymer is prepared by reacting a hydrolyzed polyvinyl acetate polymer or copolymer with at least one non-fluorinated aldehyde component, and at least one fluorinated aromatic component. The polymer is useful is preparing a photosensitive composition which comprises at least one diazo resin and at least one such fluorinated aromatic acetal polymer. Such a photosensitive composition may be applied to a support to form an imageable member which may be imaged to form a lithographic printing plates.p
Abstract:
The present invention provides a positive working imageable composition, which includes a hydroxyfunctional resin comprising a covalently bound radiation sensitive group capable of increasing the solubility of the imageable composition in an alkaline developer upon exposure to radiation; and an isocyanate crosslinking agent. The present invention further provides an imageable element, which includes a substrate and an imageable composition according to the present invention coated on a surface of the substrate and a method of producing an imaged element according to the present invention. Also provided is a radiation sensitive hydroxyfunctional resin including a covalently bound radiation sensitive group capable of increasing solubility in an alkaline developer of an imageable composition derived therefrom upon exposure of the imageable composition to radiation.
Abstract:
The present invention provides an imageable composition, which includes a bottom layer including a first strong, non-volatile acid having a pKa of not more than about 8 and coated thereon a top layer including an acid curable composition, an acid generator, an infrared absorber and optionally a colorant. The present invention further provides an imageable element, which includes a substrate and an imageable composition according to the present invention coated on a surface of the substrate. Also provided is method of producing an imaged element according to the present invention.
Abstract:
The present invention provides a thermally imageable composition, which includes an acid curable composition, an acid generator, a strong acid and optionally an infrared absorber. The present invention further provides an imageable element, which includes a substrate and a thermally imageable composition according to the present invention coated on a surface of the substrate. Also provided are methods of producing an imaged element according to the present invention.
Abstract:
The present invention includes an imageable element, comprising a substrate and a thermally imageable composition which includes a graft copolymer having hydrophobic and hydrophilic segments. Upon imagewise exposure to thermal energy, the graft copolymer produces exposed regions that are less soluble in a developer than the unexposed regions. Also included is a method of producing an imaged element which includes a graft copolymer according to the present invention.
Abstract:
The present invention includes an imageable element, which includes a sheet substrate, an imaging layer and a silicone layer, which comprises a crosslinked silicone polymer. The crosslinked silicone polymer is the curing product of a vinyl functional polysiloxane copolymer and a hydrosiloxane compound. The curing is catalyzed by a platinum carbonyl complex. Upon imagewise exposure and development, an imaged element is obtained, which is mounted on a dry printing press containing lithographic ink and used to produce printed stock.
Abstract:
The present invention provides an imageable element, which includes: a substrate; a crosslinked layer disposed on the substrate; and an imageable ink-receptive layer disposed on the crosslinked layer, the imageable ink-receptive layer including an ablation free imageable composition. The present invention provides methods of producing the above imaged element.