126results about How to "High printing durability" patented technology

The present invention provides a planographic printing plate precursor including a support, and a recording layer which is formed on the support and includes a water-insoluble and alkali-soluble resin having active hydrogen in a main chain thereof and an infrared absorbent, the solubility of the recording layer in an aqueous alkaline solution being increased by exposure to light; and a planographic printing plate precursor including a support, and a recording layer formed on the support, wherein the recording layer includes a lower layer which is formed on the support and includes a water-insoluble and alkali-soluble resin having active hydrogen in a main chain thereof, and an upper layer which is formed on the lower layer and includes a water-insoluble and alkali-soluble resin and a development inhibitor, the solubility of the upper layer in an aqueous alkaline solution being increased by exposure to light, and at least one of the lower layer and the upper layer of the recording layer includes an infrared absorbent. According to the invention, there is provided is a positive planographic printing plate precursor which can provide a printing plate directly from scanning exposure based on digital signals and is excellent in printing durability and chemical resistance.

To provide an infrared-sensitive or heat-sensitive lithographic printing plate precursor which has high printing durability and wide development latitude, and also has good developing properties capable of preventing the formation of deposits during the development. In an infrared-sensitive or heat-sensitive lithographic printing plate precursor, comprising a substrate, a first image recording layer formed on the substrate, and a second image recording layer formed on the first image recording layer, the first image recording layer contains a resin which is soluble or dispersible in an aqueous alkali solution, and the second image recording layer contains a polyurethane which has a substituent having an acidic hydrogen atom.

The invention discloses a method for manufacturing a printing plate, which includes electrolysis of grains, oxidation, coating with heat-sensitive photoresist and subsequent drying process, wherein the heat-sensitive photoresist is decomposed by alkali after being irradiated, electrolyzed During the process, a substrate surface roughness with a maximum valley depth of 2.5 microns is produced, wherein the maximum valley depth is measured with a surface roughness meter and is called the Rv value. The beneficial technical effects of the present invention are: the produced plates can not only be stored stably for several months under the condition that the maximum temperature exceeds at least 40°C, but also its plate-making time is relatively short, the printing quality is excellent, and the process of the method has great impact on production. There are no other special requirements for the equipment, and the produced plates have excellent printing performance and stable water-ink balance.

The invention provides a method for raising light guide plate screen press run and permeability. The method comprises the following steps that a, the design and production of a film negative comprises the following steps of designing the needed negative pattern firstly, symmetrically marking on the four corners of the periphery of the pattern for the counter point of a second exposure and creating a second draft pattern, remaining the same center line of the negative secondly, broadening 50 Mu m of each object line width of the pattern, creating a second draft pattern and producing two sets of films; b, coating and printing comprises the following steps of coating and exposing twice, using different natures of two photosensitive emulsions in the twice coating. Due to the fact that different natures of the two photosensitive emulsions are used in the coating, the print resistance and the permeability of the screen is improved greatly, production cost is reduced greatly.

A developer for development of electrostatic images, comprising colored particles containing a binder resin, a colorant and a parting agent, and an external additive, wherein the developer has properties that a work function is at least 5.70 eV; when excitation energy (eV) in the measurement of the work function is plotted on an axis of abscissa, and a normalized photoelectron yield represented by the 0.5th power of a photoelectron yield per unit photon is plotted on an axis of ordinate, a gradient of the normalized photoelectron yield to the excitation energy is at least 15/eV; and an extraction quantity with methanol is 5.0% by weight or less, and a production process thereof.

Provided is a toner for developing electrostatic image which is excellent in shelf stability, and is further excellent in low-temperature fixability so as to be capable of maintaining a high fixing rate even at a low fixing temperature.

A toner for developing electrostatic image is used which comprises colored resin particles containing a binder resin, a colorant, and a parting agent, wherein the parting agent is an aliphatic hydrocarbon polymer obtained by polymerizing an aliphatic hydrocarbon monomer.

Disclosed is a process for manufacturing an aluminum support for a light sensitive planographic printing plate material, the process comprising the steps of surface-roughening an aluminum plate, anodizing the surface-roughened aluminum plate, surface treating the anodized aluminum plate with an aqueous polyvinyl phosphonic acid solution, and drying the resulting plate at from 150 to 230 ° C. to obtain the aluminum support.

The invention relates to printing lithography, in particular to a printing lithographic plate (UV-CTP) for laser digital scanning and the preparation method thereof. The preparation method of the printing lithographic plate (UV-CTP) comprises the following steps: firstly cleaning, neutralizing, electrolyzing and oxidizing aluminum plate strip materials and hole-sealing to obtain the plate base; then, spread-coating the prepared photosensitive coating liquid on the plate base through extruding; and obtaining the UV-CTP after drying. The UV-CTP plate, following the photosensitive CTP plate and the thermosensitive CTP plate, belongs to a novel plate which can be directly imaged through computer digital laser scanning without pretreatment. Compared with the conventional PS plate and CTP plate, the UV-CTP plate has the following characteristics and advantages that the aluminum plate rolling technique with low deformation rate and low surface defect ensures that the plate base of the plate has better physical properties, particularly, the UV-CTP plate is advantageous in manufacturing cost, preservation period and universality over other CTP plates; and the UV-CTP plate has the characteristics of high dot reducibility, high photosensitive speed, great operating latitude and wide application, etc., therefore, the UV-CTP plate is applicable to printing materials, such as metal, plastic, etc., by the UV ink.

A printing plate material for direct plate-making includes a PET film base material; a protective layer and a photocatalytic hydrophilic layer provided on the base material; and a dot control layer provided on the hydrophilic layer and having a critical surface tension equal to or lower than a surface tension of an image forming liquid. The image forming liquid is discharged from an inkjet recording head onto a surface of the printing plate material for direct plate-making and is hardened. Thereby, a direct-made printing plate is obtained.

The invention provides a process for the manufacture of printing master, and a printing master made thereby, wherein the process comprises, using an ink composition capable of optical polymerization reaction under light illumination, which includes monomer used for optical polymerization reaction, optical polymerization initiator, coloring agent and organic solvent, to print the pattern directly onto the printing image base through high precision ink-jet printers. As the result of light struck, the ink expediting setting on the printing master can be achieved. The advantages of the process according to the invention are, no ink overflow to the periphery, clear image, and simple salting-on procedure.

A lithographic printing plate precursor comprising: a support; and a photosensitive layer containing (A) a sensitizing dye represented by the formula (I) as defined herein, (B) a polymerization initiator, (C) a polymerizable compound, and (D) a binder polymer having a crosslinkable group.

A lithographic printing plate precursor includes a support, and an image-recording layer, the image-recording layer contains a urethane resin having a polyalkylene oxide chain represented by the formula (1) as defined herein in a side chain, an infrared absorbing agent, a radical polymerizable compound and a radical polymerization initiator, and an unexposed area of the image-recording layer is capable of being removed with at least one of dampening water and ink.

To provide a lithographic printing plate precursor which is capable of undergoing image recording with infrared laser and exhibits high printing durability while maintaining stain resistance and preservation stability, and particularly, to provide a lithographic printing plate precursor capable of undergoing on-press development and a plate making method thereof, the invention is directed to a lithographic printing plate precursor comprising a hydrophilic support having thereon an image-recording layer containing (A) a polymer fine particle, (B) a radical polymerizable compound and (C) an infrared absorbing dye, wherein (A) the polymer fine particle is obtained by a reaction between a polyvalent isocyanate compound which is an adduct of a polyhydric phenol compound having two or more hydroxyl groups in its molecule and isophorone diisocyanate and a compound having an active hydrogen atom.

The invention discloses anti-solvent vinyl polymer with a multilayer structure, a synthetic method thereof and applications thereof. The polymer is synthesized by adoption of a method of core-shell emulsion copolymerization. The polymer is vinyl multipolymer having structure units as follows: an amide type structure unit with alkaline solubility, a maleimide type structure unit with alkaline solubility, an acrylate type structure unit, an acrylonitrile type structure unit and an olefin acid type structure unit. The polymer is suitable for manufacturing thermosensitive positive-image CTP plates and can allow the plates to have characteristics of high sensitivity, good storage stability, large latitude of development, good wear resistance and high pressrun. In addition, coatings of the plates are high in resistance to chemicals, and the plates are suitable for UV printing ink printing.

A photosensitive composition containing: (A) a sensitizing dye; (B) a photopolymerization initiator; (c) a polymerizable compound having an ethylenically unsaturated bond; and (D) a polymer binder, wherein the photopolymerization initiator exhibits a reaction rate constant with a semiquinone radical anion in the range of 2.0×10² to 1.0×10⁸ (mol⁻¹·l·s⁻¹).

The invention belongs to the field of inorganic materials, relates to a developer for direct plate-making by using a 405nm laser and particularly discloses a developer for an ultraviolet-computer to plate (UV-CTP) plate with peak sensing wavelength being 405nm. The developer consists of the following components in parts by weight: 40-86 parts of deionized water, 5-18 parts of sodium hydroxide, 25-40 parts of silicate, 1-8 parts of buffering agent, 0.2-2 parts of photosensitive film protecting agent and 1-5 parts of development promoting agent. The developer provided by the invention has the advantages that the developer can rapidly dissolve exposed resin film layers and can well protect unexposed resin layers, the erosion of oxide layers of non-graphic and non-text parts is less, the press run is high, the reproducibility of small dots is good, the dots are fully reproduced and the developer is suitable for high-quality printing.

Provided is a toner for developing electrostatic images that has an excellent balance between low-temperature fixability and heat-resistant shelf stability as well as good conveyance amount stability and printing durability, and causes less occurrence of fog in a high temperature and high humidity environment. The toner for developing electrostatic images of the present invention includes colored resin particles containing a binder resin and a colorant, and an external additive, wherein silica fine particles A having a sodium to silicon ratio of 0.1 to 1.8% by mass, are contained as the external additive.

The invention discloses a hyperfine double three-dimensional high molecular material integrated screen printing plate which comprises a screen frame, a polyester screen, a steel wire gauze, high molecular film layers, high molecular pattern regions, photosensitive glue pattern regions and photosensitive glue lines. The high molecular pattern regions are separately arranged on the high molecular film layers and stretch to the bottom of the steel wire gauze, the photosensitive glue pattern regions fill the high molecular pattern regions, the photosensitive glue lines are arranged in the middle parts of the photosensitive glue pattern regions, and the high molecular pattern regions and the photosensitive glue lines are of hollowed structures. In this way, the high molecular materials in middle non-printed regions of the lines are super high in abrasive resistance and high in printing resistance, the service life of screen printing can be prolonged greatly, the deformation quantities of the silk screen and the patterns are reduced greatly, the printing quality can be improved greatly, high strength of high molecules is combined and high resolution of the photosensitive glue is also available, and meanwhile, new patterns can be re-manufactured after the screen printing plate is recovered and back-washed, so that the cost is saved greatly.

The invention relates to the field of ink jet printing, and discloses polyvinyl alcohol ester sulfonate, a synthetic method thereof, a hydrophilic plate for printing and application thereof, and a printing plate. The polyvinyl alcohol ester sulfonate contains a chemical structure represented as the formula (1), wherein the sum of m and n is a positive integer of 400 to 5000; n/(m+n) is 0.05 to 1;x is a positive integer of 1 to 3; A1-A4 are independently hydrogen or C1-C6 alkyl groups; M is Li, Na, K or NH4. The hydrophilic high-molecular compound can greatly improve hydrophilicity of a coating layer and improve printability of the hydrophilic plate.

The invention discloses an offset print water-borne UV (ultraviolet) photo-sensitive resist jetting plate-making method which comprises the following steps: firstly jetting a water-borne UV photo-sensitive resist on a hydrophilic metal base by using an ink-jet printing device, and forming an oiliness information recording region on the surface of the metal base; and in addition, curing a information recording region on the surface of the metal base by using an ultraviolet lamp, and then printing on the machine. The offset print water-borne UV photo-sensitive resist jetting plate-making method is simple in process, rapid in printing plate drying speed, less in energy consumption, good in printing plate quality, good in printing-resistance rate, and free from environment pollution.

The invention discloses a method for preparing a bottom die for flexible resin plates, which comprises the following the step of: exposure, namely, providing a film and a flexible resin plate, reversely placing the flexible resin plate above the film, and carrying out exposure on the flexible resin plate for 360-400 seconds by using an iodine gallium lamp with power of 3000W; development, namely, flushing the surface of the flexible resin plate subjected to exposure by using water at a temperature of 30-35 DEG C under the pressure of 5-28MPA, wherein the flushing time is controlled within 12-15 minutes, and a part (0.2-0.3 mm) of a resin layer base is kept on the whole surface of the flexible resin plate; drying, namely, putting the plate subjected to development into a drying oven to bake for 4-5 hours at a temperature of 50-60 DEG C; and post-exposure, namely, after the plate is completely dried, putting the plate without being covered with any object under an iodine gallium lamp with power of 8000W for 130-150 seconds, then carrying out fast cooling on the plate for 2-3 minutes in a refrigerating drying tunnel. The method disclosed by the invention has the advantages that the plate is low in cost, environment-friendly in manufacturing process, and high in print resistance rate.