摘要:
The present invention provides a correcting liquid for silver imaged lithographic printing plates being an aqueous solution having a pH in the range between 5.5 and 8.5 and comprising a iron (III) complex salt of an organic acid, a sulphite or a metabisulphite, a silver halide solvent and an accelerator, said accelerator being an organic heterocyclic compound having a mercapto- or thione group and not having a hydrophilic substituent besides the said mercapto or thione group characterized in that said accelerator is present in an amount ranging from 0.04 to 0.4 mole per liter of correcting liquid.
摘要:
A kit for preparing a processing liquid for use in the preparation of a lithographic printing plate according to the silver salt diffusion transfer process, and comprising all necessary active compounds for preparing said processing liquid, said active compounds including a hydrophobizing agent, said hydrophobizing agent being provided in a concentrated dissolved liquid state.
摘要:
The present invention provides an imaging element comprising on one side of a support a photosensitive layer comprising a silver halide emulsion and an image receiving layer containing physical development nuclei in water permeable relationship with said emulsion layer and on the other side of the support at least one backing layer comprising gelatin and a dye and/or a dye precursor characterized in that said dye or dye precursor is such that after treatment of said imaging element in an alkaline solution with a pH of 10.9 for 20 s at a temperature of 30.degree. C. the backing layer has a reflection spectrum when treated for 20 s at 20.degree. C. in a neutralizing solution with a pH of 7.5 that is visually different from the reflection spectrum when treated for 20 s at 20.degree. C. in a neutralizing solution with a pH of 8.5.
摘要:
The present invention provides a method for making a lithographic printing plate according to the silver salt diffusion transfer process comprising the steps of image-wise exposing an imaging element comprising on a support a photosensitive layer comprising silver halide emulsion(s) wherein less than 1 mole % of the silver halide is silver bromide and an image receiving layer containing physical development nuclei and developing said imaging element using an alkaline processing liquid with a pH lower than 11.5 in the presence of developing agent(s) and a meso-ionic compound.
摘要:
The present invention provides a method for making a lithographic printing plate according to the silver salt diffusion transfer process comprising the steps of: image-wise exposing an imaging element comprising on a support a photosensitive layer comprising a silver halide emulsion and an image receiving layer containing physical development nuclei, developing said imaging element in the presence of developing agent(s) and silver halide solvent(s) using an alkaline processing liquid and neutralizing a thus obtained developed imaging element using a neutralization solution having a pH between 4 and 10.5 and comprising a hydrophobizing agent and a buffer characterized in that said neutralization solution comprises a salt of sulfurous acid.
摘要:
The present invention provides a method for making a lithographic printing plate according to the silver salt diffusion transfer process comprising the following steps: image-wise exposing with a high intensity-short time exposure with light with a wavelength between 600 nm and 700 nm an imaging element comprising on a support (1) a photosensitive layer comprising at least one photosensitive silver halide emulsion sensitized to light by means of one or more cationic carbocyanine sensitizing dye having a maximum absorption between 600 nm and 700 nm, the silver halide crystals of said silver halide emulsion comprising more than 95 mole % of silver chloride per mole of silver halide and (2) an image receiving layer comprising physical development nuclei in a water permeable relationship with said photosensitive layer, developing said imaging element using an alkaline processing liquid in the presence of (a) developing agent(s) and (a) silver halide solvent(s), characterized in that said silver halide crystals contain silver iodide between 0.25 mole % and 2 mole %/mole silver halide in the outer 10% by weight region of said crystals.
摘要:
The present invention provides an imaging element for making a lithographic printing plate according to silver salt diffusion transfer processing, said imaging element comprising on a support a silver halide emulsion layer and a receiving layer, said receiving layer comprising (i) physical development nuclei, (ii) an inorganic colloidal substance and (iii) a hydrophilic polymer being a homo- or copolymer of acrylamide or methacrylamide.
摘要:
A kit of parts for preparing an alkaline processing liquid for use in preparing a lithographic printing plate according to the silver salt diffusion transfer process, and comprising all necessary active compounds for preparing said alkaline processing liquid, said active compounds being contained in parts physically separated from each other, at least one of said parts comprising an inorganic alkali in solid form and at least one of said other parts comprising a hydrophobizing agent and being substantially free from inorganic alkali.
摘要:
A radiation curable toner is described having at least a radiation curable binder (e.g. a UV curable polymer), a photoinitiator, and a wax; wherein the wax is present in a concentration ranging from 0.3 to 3% by weight. The ratio of scratch resistance before curing is preferably at least 2. The toner may be used in a developer, e.g. a two-component developer, for printing or copying.
摘要:
The present invention provides dry toner particles comprising at least a radiation curable resin, and a colouring agent, wherein the circularity of the toner particles is between 0.95 and 0.99 and a charge control agent in a concentration between 0.025% and 1.0% by weight is present preferably as an external additive.The toners of this invention are useful for printing any substrate and for use in any form of printing or marking device.