摘要:
A developing and finishing composition for lithographic printing plates containing:a. a mono-, di-, or tri-sodium potassium or lithium phosphate; andb. benzyl alcohol, phenoxyethanol or phenoxypropanol; andc. polyvinyl pyrrolidone, dextrin, poly (methyl vinyl ether/maleic acid) or gum arabic; andd. citric acid or benzoic acid; ande. sodium or potassium octyl sulfate; andf. sodium, potassium or lithium benzoate; andg. sodium, potassium or ammonium citrate; andh. sodium, potassium or ammonium sorbate; andi. sufficient water to formulate an effective developer.
摘要:
A developing and finishing composition for lithographic printing plates containing:a. a mono-, di-, or tri-sodium, potassium or lithium phosphate; andb. benzyl alcohol, phenoxyethanol or phenoxypropanol; andc. polyvinyl pyrrolidone, dextrin, poly (methyl vinyl ether/maleic acid) or gum arabic; andd. citric acid or benzoic acid; ande. sodium or potassium octyl sulfate; andf. sodium, potassium or lithium benzoate; andg. sodium, potassium or ammonium citrate; andh. sodium, potassium or ammonium sorbate; andi. sufficient water to formulate an effective developer.
摘要:
This invention provides novel ethylenically unsaturated urethane monomers and photoreactive compositions comprising such monomers as essential constituents. The monomers can be photopolymerized or photocrosslinked and are useful in coating systems and multilayer color proofing systems. Additionally, they offer superior advantages such as significantly reduced migration between layers in multilayer color proofing systems.
摘要:
A composition capable of removing the non-image areas of an imagewise exposed photographic element, consisting essentially of in admixture:(a) from at least about 5% to about 30% by weight benzyl alcohol; and(b) from about 1% to about 20% by weight of one or more compounds selected from the group consisting of sodium xylene sulfonate and sodium cumene sulfonate; and(c) from about 5% to about 40% by weight potassium toluene sulfonate; and(d) water.
摘要:
A developer composition for positive photosensitive lithographic printing plates and photoresists comprising an aqueous solution of an inorganic lithium compound and sodium metasilicate.
摘要:
The present invention relates to a method for negative a positive image, using a negative acting color proofing element comprising, sequentially, a strippable cover sheet; a crosslinked layer containing a polymer having phenolic groups; a color layer, containing a colorant, a polymeric binder, a polymerizable monomer and, optionally, a photoinitiator; a photoadhering layer containing polymerizable groups, and, optionally, a free radical photoinitiator; and a optional thermoplastic adhesive layer. At least one of the color layer and the photoadhering layer containing the photoinitiator. The element is first exposed to actinic radiation and then laminated to a receiver sheet. The composite peeled apart to thereby form a colored negative image on the receiver sheet.
摘要:
The invention is a method for preparing a photographic element which comprises imagewise exposing a photographic element, and removing the non-image areas thereof by contacting said element with a composition consisting essentially of in admixture:a) from at least about 5% to about 30% by weight of the developer of benzyl alcohol; andb) from about 1% to about 20% by weight of the developer of one of more compound selected from the group consisting of sodium xylene sulfonate and sodium cumene sulfonate; andc) from about 5% to about 40% by weight of the developer of potassium toluene sulfonate; andd) water in sufficient amount of formulate effective developer for imagewise exposed photographic elements.
摘要:
A light-sensitive composition for the preparation of printing plates is described, which contains a water-insoluble binder which is soluble in aqueous-alkaline solutions; a light-sensitive component which is an o- or p- quinone diazide, a diazonium salt polycondensation product or a mixture of(a) a compound which eliminates an acid on exposure to light and(b) a compound having at least one C--O--C group which can be split by acid; and a thermo-crosslinking compound which is a cyclical acid amide of the general formula: ##STR1## wherein R denotes a hydrogen atom or an alkyl group. The printing plates can be baked at lower temperatures than plates without a crosslinking agent, but nevertheless have a long shelf life.
摘要:
The invention provides a method for developing negative working photographic elements using an aqueous developer comprising(a) a solvent composition consisting essentially of(i) n-propanol or isopropanol; and(ii) a glycol ether or acetate(b) a salt which is preferably magnesium sulfate; and(c) an ethoxylated alkyl phenol type non-ionic surfactant.
摘要:
A negative-acting color proofing element comprising, sequentially, (i) a strippable, transparent cover sheet; (ii) a crosslinked layer, which comprises a polymer having phenolic groups; (iii) a color layer, which comprises an organic binder, a polymerizable monomer, a colorant, and an optional photoinitiator, (iv) a photoadhering layer, which comprises a polymerizable component having at least one ethylenically unsaturated group; a polymer comprising polyvinyl acetal and polyvinyl alcohol segments, having from about 1 to about 40 weight % polyvinyl alcohol content; and an optional photoinitiator, wherein least one of either the color layer or the photoadhering layer contains a photoinitiator; (v) a thermoplastic adhesive layer; and (vii) a receiver sheet. Preferably the polymerizable component and photoinitiator diffuse into the color layer during assembly of the element. An image is produced by laminating the photosensitive element to a receiver sheet; imagewise exposing the color layer and the photoadhering layer to actinic radiation through the transparent cover and crosslinked phenolic layer; peeling apart the receiver sheet and the transparent cover sheet, leaving exposed areas of the color layer attached to the receiver sheet via the photoadhering layer and adhesive layer and unexposed areas being removed with the cover sheet and the crosslinked phenolic layer, thereby forming a colored negative image on the receiver sheet. Preferably these image producing steps are repeated at least once wherein another photosensitive element having a different colorant is transferred via its photoadhering and adhesive layers to the negative image previously produced on the receiver sheet.