摘要:
A process for producing a photosensitive lithographic plate comprises coating onto a substrate having a hydrophilic surface a solution of a negative working photosensitive composition containing a photosensitive diazo resin and a linear organic polymer dissolved in a solvent mixture comprising:(a) at least 10 wt. % of 1-methoxy-2-propanol,(b) an amino group-free polar solvent having a boiling point under 1 atm of 50.degree. to 100.degree. C. and a dielectric constant at 20.degree. C. of at least 5.5, and(c) 2 to 50 wt. % of methyl lactate,and drying the coated solution.
摘要:
A light-sensitive composition which is developable with an aqueous alkaline solution, comprising (a) at least one light-sensitive resin obtained by adding an active mercaptocarboxylic acid to a part of carbon-carbon unsaturated bonds of a polymer having at least two photodimerizable unsaturated double bonds adjacent to an aromatic nucleus in the main chain thereof and (b) optionally at least one negative-working diazo resin. The light-sensitive composition makes it possible to prepare a light-sensitive plate capable of developing with an aqueous alkaline solution without forming insoluble substances in the developer during the development and the adhesive force between the substrate and the light-sensitive layer of the plate is increased, which in turn substantially improves the printing durability of the lithographic printing plate as a final product.
摘要:
The present invention relates to a photosensitive composition suitable for the use in the preparation of a photosensitive lithographic plate. The photosensitive composition comprises (1) a polymer having a maleimido group in its side chain and being capable of being photocrosslinked, such as a copolymer of methyl methacrylate/N-[2-(methacryloyloxy)-ethyl]-2,3-dimethylmaleimide/methacrylic acid=15/65/20 (weight ratio) and (2) a diazo resin such as dodecylbenzenesulfonate of condensate of p-diazodiphenylamine and formaldehyde.
摘要:
The apparatus and method for measuring the intraocular pressure of an eyeball is constructed so that the image of the fluorescent ring around the flattened surface of the eyeball is formed to measure the area of the flattened surface, and that the intraocular pressure of the eyeball is calculated in accordance with the pressure against the eyeball and the area of the flattened surface corresponding thereto.
摘要:
A color measuring apparatus including a photoelectric conversion device for outputting basic color signals corresponding to quantities of light of basic color components of a sample, respectively, a calculating device for calculating a color value of the sample in a predetermined colorimetric system, a target setting device for setting a target color value of the sample in the predetermined colorimetric system, a region setting device for setting a predetermined region containing the target color value, a region decision device for deciding whether or not the color value falls within the predetermined region, an approximation decision device for deciding whether or not the color value has most approximated to the target color value and an output device for outputting a result of the decision of the approximation decision device.
摘要:
A developing solution for developing a light-sensitive lithographic plate having a o-quinonediazide compound-containing light-sensitive layer is disclosed. The developing solution is comprised of an aqueous solution containing alkali silicate and an alkali aqueous solution-soluble compound of a metal selected from the group consisting of Sn, Pb, Fe, Co and Ni. The developing solution provides excellent resolving power, has excellent development stability, processing capability and adaptability with respect to automatic developing machines.
摘要:
A developer for a light-sensitive lithographic printing plate having an o-quinonediazide-containing light-sensitive layer is disclosed. The developer is comprised of an aqueous solution of an alkali silicate containing an organic boron compound. The organic boron compound is represented by the formula ##STR1## the substituents are defined within the specification. By utilizing the developer of the invention it is possible to provide excellent developing power, development stability, processability and preferred forming properties during development.
摘要:
A developing solution for a light-sensitive printing plate having an o-quinonediazide-containing light-sensitive layer is disclosed. The developing solution is comprized of an aqueous solution of alkali silicate and a chelating agent. By including the chelating agent within the developing solution it is possible to carry out development utilizing water which contains typical impurities such as insoluble calcium silicate or magnesium silicate for a long period of time which substantially has no formation of insoluble matter within the developing machine. Use of the developing solution substantially eliminate the formation of any deposit within the spraying pipes and nozzles of the developing machine which it is used in connection with.
摘要:
A diaphragm device in which a plurality of diaphragm blades are arranged in partly overlapping relation to one another. This diaphragm device provides a diaphragm aperture of a substantially elongated circle having its length extending in a specific direction, when stopped down beyond a given diaphragm aperture. More particularly, the diaphragm aperture is defined by a pair of arcs which oppose each other in a direction perpendicular to the specific direction passing through the center of the aperture and another pair of arcs which are disposed on the opposite sides in the aforesaid specific direction, while the distance of either one of the pair of arcs to the center of the aperture is shorter than the distance of either of the other pair of arcs to the center of the aperture. These pairs of arcs define portions of the inner peripheral edges of the diaphragm blades.
摘要:
A heat-sensitive lithographic printing plate precursor comprising a substrate having ink-receptive surface or coated with an ink-receptive layer having provided thereon a hydrophilic layer which comprises: (1) a colloid of an oxide or a hydroxide of at least one element selected from the group consisting of beryllium, magnesium, aluminum, silicon, titanium, boron, germanium, tin, zirconium, iron, vanadium, antimony, and transition metals, (2) a hydrophilic resin, and (3) a light-to-heat conversion material.