Abstract: Provided is a process of making a collection of polymeric beads, wherein the beads comprise (i) 75 to 99.7% by weight, based on the weight of the bead, polymerized units of monofunctional vinyl monomer, and (ii) 0.3 to 25% by weight, based on the weight of the bead, polymerized units of multifunctional vinyl monomer; wherein the process comprises (a) providing an aqueous suspension of monomer droplets comprising initiator, multifunctional vinyl monomer, and monofunctional vinyl monomer; (b) initiating polymerization of the monomer in the monomer droplets; (c) while the polymerization of the monomer in the monomer droplets is occurring, adding a monomer feed solution to the suspension.

Abstract: An intermediate transfer member (ITM) for use with a printing system, the ITM having (a) a support layer; and (b) a release layer having an ink reception surface and a second surface opposing the ink reception surface, the second surface attached to the support layer, the release layer formed of an addition-cured, hydrophobic silicone material, wherein the release surface of the release layer has relatively hydrophilic properties with respect to the addition-cured, hydrophobic silicone material.

Abstract: The present invention provides a plating method capable of easily performing various decorative plating processes. The plating method includes a bulge forming process of forming a bulge on an object to be plated by ejecting ink drops of first UV-curable ink from an inkjet head such that the ejected ink drops land on the object, and a plating process of plating the object having the bulge formed thereon, after the bulge forming process. Also, in the bulge forming process, the bulge is formed such that a second surface of the bulge to be plated has surface roughness different from that of a first surface of the object to be plated.

Abstract: Techniques and systems for sub-pixel grayscale three-dimensional (3D) printing are described. A technique includes mapping a 3D digital model onto a 3D grid of voxels associated with a 3D printer; assigning a first intensity level to first voxels that are fully contained within the model, the first intensity level being sufficient to cure photoactive resin during a curing time; determining, based on geometric information provided by the model, containment degrees for second voxels that are partially contained within the model; assigning second intensity levels to the second voxels based respectively on the containment degrees, the second intensity levels being greater than a third intensity level and lesser than the first intensity level; assigning the third intensity level to third voxels that are outside of the model; and generating one or more graphic files based on the first, second, third voxels, and respectively assigned intensity levels.

Abstract: A toner including base particles and external additives on the base particles, the toner satisfying Conditions 1 and 2 defined in the specification, when a number distribution D of particle diameters of powder particles B generated from one base particle A is calculated from a density a of the base particles A and a density b of the powder particles B, where the base particles A and the powder particles B are deposited on an adhesive area and mica respectively by feeding the toner into a vacuumed space from an inlet, and allowing the toner to crush against a surface of a substrate having the adhesive area composed of a carbon tape, and the mica disposed in a manner that the surface is orthogonal to a direction connecting between center of the vacuumed space and center of the inlet, Powder particles B: particles detached from the base particles.

Abstract: Methods and systems for contacting a polymerizable material on a surface of a substrate with a patterning surface of a template; curing the polymerizable material in a working environment, comprising a first gas, the working environment proximate to the surface of the substrate; after introducing a second gas into the working environment, separating the patterning surface of the template and the surface of the substrate to achieve at least a particular distance between the patterning surface and the surface of the substrate; and after achieving the particular distance, introducing a third gas into the working environment, wherein, for a given pressure of the working environment, the second gas has a breakdown voltage less than that of the first gas up to the particular distance, and the third gas has a breakdown voltage less than that of the second gas at distances greater than the particular distance.

Abstract: Liquid electrophotography apparatus including a plurality of members defining a flow path for a printing liquid. At least a first member of the plurality of members is arranged to generate an electric field. The liquid electrophotography apparatus also includes a first insulation layer arranged around at least a portion of a surface of the first member to prevent electrical discharge from the printing liquid.

Abstract: A fixing device includes an endless belt being applied with a lubricant on an inner circumferential surface of the endless belt. A pressure rotator presses against a nip formation pad via the endless belt to form a fixing nip between the endless belt and the pressure rotator. A radiant heater heats the endless belt. At least one contact heater heats at least one lateral end of the endless belt in an axial direction of the endless belt. At least one temperature detector detects a temperature of the endless belt. A controller controls the at least one contact heater to generate heat, controls the endless belt to rotate, and controls the radiant heater to generate heat sequentially based on the temperature of the endless belt that is detected by the at least one temperature detector.

Abstract: A transparency includes a transparent substrate and a plurality of electrically conductive lines on the transparent substrate, at least one of the electrically conductive lines intersecting at least one other electrically conductive line, and at least one of the electrically conductive lines having a width of no more than 50 ?m to reduce distraction resulting from optical diffraction of light transmitted through or reflected by the transparency as compared to a transparency comprising electrically conductive lines having a width greater than 50 ?m. A coated substrate includes: a substrate; a dielectric layer on the substrate; and a sensor including a conductive layer on the dielectric layer, where at least one layer selected from the dielectric layer and the conductive layer is formed by at least one method selected from lithography, inkjet printing, and aerosol jet printing.

Abstract: The present wet development device includes a developer carrying member, a supply member that supplies a liquid developer to the developer carrying member, a charger that charges the liquid developer on the developer carrying member, a cleaner that removes the liquid developer on the developer carrying member, and a bias applying member that applies alternating bias in contact with the developer carrying member before removing by the cleaner. In a direction in alignment with an axis of rotation of the developer carrying member, a range to which the alternating bias is applied by the bias applying, member is located within a range in which the liquid developer is supplied onto the developer carrying member.

Abstract: A positive-type resist composition which generates an acid upon exposure and whose solubility in an alkali developing solution increases under the action of an acid, the composition including a base material component whose solubility in an alkali developing solution increases under the action of an acid; and a compound represented by the following general formula (m0): Z01 to Z04 each independently represent a substituent having electron withdrawing properties, Rb21 and Rb22 each independently represent an alkyl group, an alicyclic hydrocarbon group which may have a substituent, or a hydroxyl group, Rb1 represents an aryl group which may have a substituent, an alkyl group, or an alkenyl group, n1 and n2 represent an integer of 0 to 3, and X0? represents an organic anion.

Abstract: An image forming unit includes an image carrier; a first roller that is in contact with and charges the image carrier; a second roller that is in contact with the first roller and obtains toner from or supplies toner to the first roller; an exposure section that irradiates the charged image carrier with light to form an electrostatic latent image; a development section that develops the electrostatic latent image to form a toner image; a transfer section that transfers the toner image to a transfer member; a control section that performs control such that the toner moves from the image carrier to the first roller and to the second roller or such that the toner to moves from the second roller to the first roller and to the image carrier; and a collecting member that collects the toner that has moved from the first roller to the image carrier.

Abstract: A metal circuit structure, a method for forming a metal circuit and a liquid trigger material for forming a metal circuit are provided. The metal circuit structure includes a substrate, a first trigger layer and a first metal circuit layer. The first trigger layer is disposed on the substrate and includes a first metal circuit pattern. The first metal circuit layer is disposed on the first circuit pattern and is electrically insulated from the substrate. The composition of the first trigger layer includes an insulating gel and a plurality of trigger particles. The trigger particles are at least one of organometallic particles, a chelation and a semiconductor material having an energy gap greater than or equal to 3 eV. The trigger particles are disposed in the insulating gel, such that the dielectric constant of the first trigger layer after curing is between 2 and 6.5.

Abstract: A conductive pattern can be formed using a polymeric layer that contains a reactive composition having a reactive polymer. This reactive polymer comprises pendant photosensitive 1,2-diarylethylene groups. The reactive composition can be patternwise exposed to suitable radiation to induce crosslinking within the reactive polymer. The reactive composition and reactive polymer in the non-exposed regions can be removed due to their aqueous solubility, but the exposed regions of the polymeric layer are contacted with electroless seed metal ions, which are then reduced, followed by electrolessly plating with a suitable metal to form the desired conductive pattern. Various articles can be prepared during this process, and the product article can be incorporated into various electronic devices.

Abstract: An image forming apparatus includes an image forming unit that forms an image on a recording medium; a width detector that detects positions of side edges of the recording medium in a width direction, which is orthogonal to a conveying direction in which the recording medium is conveyed, at multiple detection positions along the conveying direction; a shape calculator that calculates angles between the conveying direction and straight lines each connecting the positions of the same side edge detected at the multiple detection positions and calculates a shape of the recording medium based on the angles; and a correction unit that corrects image data of the image to be formed by the image forming unit based on the calculated shape of the recording medium.

Abstract: A fixing device includes a heating element extending in a first direction and configured to generate heat, a nip member extending along the heating element in the first direction and configured to receive radiant heat from the heating element, an endless belt extending along the heating element in the first direction, a backup member extending along the heating element in the first direction, and an adhesive. The endless belt is configured to rotate. The endless belt surrounds the heating element and the nip member. The backup member nips the endless belt in cooperation with the nip member. The adhesive is disposed between the heating element and the nip member and fixes the heating element and the nip member relative to each other.

Abstract: In a method for re-imaging a printing form that has been used for printing in a prior printing process a substrate of the printing form is cleaned globally of ink or varnish and the substrate is treated abrasively globally in order to erase a preceding printing image. The substrate to be imaged with a new printing image is treated locally in image regions with a pulsed laser beam and, in the process, a nanoscopic and hydrophobic surface structure is produced locally. The substrate is treated globally with a hydrophilicity intensifier, as a result of which the substrate becomes hydrophilic locally in the previously hydrophobic image regions. An apparatus has a corresponding erasing unit and an imaging unit with a femtosecond laser.

Abstract: An alkali soluble resin is disclosed comprising a first monomeric unit including at least one sulfonamide group and a second monomeric unit derived from the monomer according to the following structure (I) wherein R1 represents a structural moiety comprising an ethylenically unsaturated polymerizable group; R2, R3 and R4 independently represent hydrogen, an optionally substituted alkyl, alkenyl, alkynyl, alkaryl, aralkyl, aryl or heteroaryl group or, the necessary atoms to form a five to eight membered ring.

Abstract: A method for producing a lithographic plate from a negative working, radiation imageable plate having an oleophilic resin coating that reacts to radiation by cross linking and is non-ionically adhered to a hydrophilic substrate. The steps include imagewise radiation exposing the coating to produce an imaged plate having partially reacted image areas at an initial double bond conversion rate including unreacted coating material, and completely unreacted nonimage areas; developing the plate by removing only the unreacted, nonimage areas from the substrate while retaining unreacted material in the image areas; and subjecting the upper surface of the plate to blanket post treatment energy, which further reacts the retained unreacted material in the image areas to increase the initial double bond conversion rate, producing a lithographic printing plate with enhanced durability.

Abstract: Forming an imaging blanket for a printing apparatus includes depositing a patternable material over a substrate, etching the patternable material according to a desired exposure pattern, hardening the etched patternable material to thereby form a template surface comprising a desired template pattern of texture features, depositing a layer of curable liquid polymer over and in physical contact with the template surface, curing the liquid polymer to thereby form the imaging blanket, and removing the imaging blanket from the template surface to thereby expose a patterned imaging surface of the imaging blanket. The image blanket may thereby be provided with a desired texture surface, for example comprised of individual molded image blanket features, such as recesses or pillars, of a desired cross-sectional shape. The image blanket is configured for and may be disposed on an image forming member of a variable data lithography system.

Abstract: A method is used to prepare lithographic printing plates by developing positive-working lithographic printing plate precursor that has a single imageable layer that comprises a polymer binder having recurring units represented by Structure (Ib) below: wherein the recurring units of Structure (Ib) are present in an amount of at least 25 and up to and including 60 mol %, all based on total recurring units in the polymer binder, and R2 is a substituted or unsubstituted hydroxyaryl group in which the hydroxyl group is ortho to the ester linkage, to form exposed and non-exposed regions in the imageable layer. The resulting imaged lithographic printing plate is developed using a silicate-free developer composition having a pH of at least 12 and comprising at least 0.001 gram-atom/kg of a metal cation M2+ selected from the group consisting of barium, calcium, strontium, and zinc cations.

Abstract: Sequentially subjecting an imaged ablation-type printing member having a silicone topmost layer to, first, a cleaning liquid that is not a solvent for silicone, followed by subjecting to a second cleaning liquid that is a silicone solvent, conditions the printing member for subsequent printing with high-solids inks.

Abstract: A polymerizable composition contains a binder polymer containing a functional group having a dipole moment of 3.8 debye or more and being represented by the formula (1), (2), (3), (4) or (5) as defined herein, a radical polymerizable compound and a radical polymerization initiator.

Abstract: An apparatus, a method, and a plate made by the method, e.g., using the apparatus. The apparatus includes a light tunnel of light reflective walls with polygonal cross-section like a kaleidoscope, and a light source, located at one end to produce light radiation to the inside of the light tunnel towards the other end. Light entering the light tunnel towards an inner reflective surface of a wall is reflected off the inner reflective surface so that it can emerge from the other end to cure a plate having photo-curable material thereon.

Abstract: Imaging of positive-working, IR-sensitive printing plates that use a novolac resin as the major polymer component of the imaging layer takes place with greater post-exposure latitude. In various embodiments, the imaging layer includes one or more poly(vinyl phenol) polymers or copolymers combined with one or more vinyl phenol monomers.

Abstract: A lithographic printing plate precursor includes a support and a layer containing a polymer compound having at least one support-adsorbing group at a terminal of a main chain.

Abstract: A lithographic printing plate precursor includes an image-recording layer and a support, and the image-recording layer contains: (A) at least one compound selected from compounds represented by the following formulae (1) and (2); and (B) an infrared absorbing agent: wherein R1 and R2 each represents Ra—SO3—, Ra—CO2— or Ra—OCO2—, Ra represents a monovalent organic group, R3 to R12 each represents a hydrogen atom or a monovalent substituent, or adjacent two of R3 to R12 may be combined with each other to form a ring, X1, Y1 and Z1 and X2, Y2 and Z2 each represents an atomic group necessary to form a thiazole ring, an oxazole ring, an imidazole ring, a triazole ring or a 3H-indole ring, provided that one nitrogen atom of the imidazole ring is connected to a hydrogen atom or a monovalent organic group.

Abstract: A printhead subsystem is disclosed for selectively removing portions of a layer of dampening fluid disposed over an arbitrarily reimageable surface in a variable data lithographic system. The subsystem comprises a thermal printhead element disposed proximate the arbitrarily reimageable surface, and driving circuitry communicatively connected to the thermal printhead for selectively temporarily heating the thermal printhead to an elevated temperature. Portions of the dampening fluid layer proximate the thermal printhead are vaporized and driven off the arbitrarily reimageable surface by the thermal printhead when the thermal printhead is at the elevated temperature, to thereby form voids in the dampening fluid layer.

Abstract: A heat-sensitive positive-working lithographic printing plate precursor comprising (1) a support having a hydrophilic surface or which is provided with a hydrophilic layer, (2) a heat-sensitive coating, comprising an underlayer on said support and thereon an upperlayer, an IR absorbing agent in at least one of said underlayer and upperlayer, a phenolic resin in said upperlayer, and a first polymer in said underlayer, characterized in that said first polymer is an alkaline soluble polymer comprising a first sulfonamide containing monomeric unit having a specified structure according to formula I or formula II and a second amide containing monomeric unit having a specified structure according to formula III. The printing plates show an improved chemical resistance of the coating and a reduced undercutting of the image forming parts of the coating.

Abstract: A reusable printing form is treated after printing. The printing form has a substrate provided with amphiphilic molecules and it is cleaned to remove printing ink and provided with amphiphilic molecules, for fresh printing in the course of a reimaging process. Here, the printing form is provided with amphiphilic molecules in the course of the reimaging process substantially before cleaning to remove the printing ink.

Abstract: A method of developing a laser sensitive lithographic printing plate is described. The plate comprises on a substrate a photosensitive layer soluble or dispersible in ink and/or fountain solution and capable of hardening upon exposure to a laser. The plate is exposed with a laser and deactivated under a safe light or in the dark, and then on-press developed with ink and/or fountain solution preferably under white light. Alternatively, the plate is developed off press with ink and/or fountain solution, or with an organic solvent-based or oil-based liquid or paste and/or an aqueous solution, and then mounted on press for lithographic printing.

Abstract: A radiation-sensitive composition can be used to prepare positive-working imageable elements having improved sensitivity and solvent resistance. These elements are useful for making lithographic printing plates and printed circuit boards. The composition includes a water-insoluble polymeric binder that has at least 20 mol % of recurring units comprising hydroxyaryl carboxylic acid ester groups, some of which can be substituted with cyclic imide moieties.

Abstract: This invention relates to iodonium salts, acetal copolymers and polymer binders comprising functional groups capable of undergoing cationic or radical polymerization, their method of preparation and their use in the preparation of coating solutions and coatings. This invention also relates to coatings containing the iodonium salts, acetal copolymers and/or polymer binders and to negative working lithographic printing plates comprising these coatings.

Abstract: Permeability transitions rather than ablation mechanisms facilitate selective removal of the imaging layer of a lithographic plate, which allows for imaging with low-power lasers that need not impart ablation-inducing energy levels.

Abstract: Permeability transitions rather than ablation mechanisms facilitate selective removal of the imaging layer of a lithographic plate, which allows for imaging with low-power lasers that need not impart ablation-inducing energy levels.

Abstract: A negative-working photosensitive material is provided which includes: a support; an undercoat layer; and a photosensitive layer including a polymerization initiator, a polymerizable compound, and a binder polymer, wherein the support, the undercoat layer, and the photosensitive layer are sequentially layered, the undercoat layer includes a polymer including a structural unit (a) including at least one of a carboxylic acid or a carboxylic acid salt and a structural unit (b) including at least one carboxylic acid ester; and the content of the structural unit (a) in the polymer is from 30% to 90% by mole. Also, a negative-working planographic printing plate precursor including the negative-working photosensitive material is provided.

Abstract: A method for imaging a printing form, in particular within a press, is disclosed. A printing form having a rewritable surface being provided, and an imaging material being applied to the surface of the printing form in order to provide a permanent and erasable image. During imaging, in a first step the imaging material is sprayed onto the surface with a relatively low resolution in an image data-oriented manner, and in a second step the imaging material sprayed onto the surface being exposed on the surface with a relatively high resolution in an image data-oriented manner.

Abstract: A method for digital imaging of a printing form (10) through application of energy is described, in which a burn-off area (66) is detachably fixed by supporting points (68, 84), supporting points (68, 84) being left in place on the printing form (10) through non-imaging of image spots (112) and in which the burn-off from the burn-off area (66) is detached from the printing form (10) in a cleaning step. A supporting point (68, 84) at a reference point is left in place precisely if the number of image spots (110) to be imaged in a surrounding area (18) of the reference point (12) exceeds a limit value and a boundary area (20) in the surrounding area (18) around the reference point (12) contains only image spots (110) to be imaged.

Abstract: A method for treating a re-imageable printing form includes surface modifying a surface of the printing form acting as a printing area in a nanoscopic range by chemically functionalizing the surface through covering with molecules, in particular amphiphilic molecules or polymers. The printing form is subjected to a primary process of imaging by laser radiation, and subjected to a primary process of application of at least one lithographic fluid, for example dampening solution, printing ink and/or varnish. The molecules are fixed in image regions by the primary process of imaging. The molecules are removed in non-image regions substantially by at least one primary process different than the application of printing ink, in particular by imaging, application of dampening solution or chemical developing. An apparatus for treating a re-imageable printing form, a machine for processing printing material and a method for treating a surface contacting printing material, are also provided.

Abstract: Positive-working imageable elements comprise a radiation absorbing compound and inner and outer layers on a substrate having a hydrophilic surface. The inner layer comprises a specific polymeric binder represented by Structure (I): -(A)w-(B)x-(C)y-(D)z-??(I) wherein A represents recurring units derived from one or more N-alkoxymethyl (alkyl)acrylamides or alkoxymethyl (alkyl)acrylates, B represents recurring units derived from one or more ethylenically unsaturated polymerizable monomers having a pendant cyano group, C represents recurring units derived from one or more ethylenically unsaturated polymerizable monomers having one or more carboxy, sulfonic acid, or phosphate groups, D represents recurring units derived from one or more ethylenically unsaturated polymerizable monomers other than those represented by A, B, and C, w is from about 3 to about 80 weight %, x is from about 10 to about 85 weight %, y is from about 2 to about 80 weight %, and z is from about 10 to about 85 weight %.

Abstract: Negative-working imageable elements that can be imaged using infrared radiation comprise an imageable layer and a protective overcoat on a hydrophilic substrate. The imageable layer includes an IR-sensitive cyanine dye. The protective overcoat predominantly comprises one or more poly(vinyl alcohol) resins, each of which has a hydrolysis level of 85% or less. The use of this particular overcoat composition used in combination with the IR-sensitive cyanine dye provides improved tolerance to fogging by white light while maintaining desired imaging speed.

Abstract: A method of developing a laser sensitive lithographic printing plate with ink and/or fountain solution is described. The printing member comprises on a substrate a photosensitive layer soluble or dispersible in ink and/or fountain solution and capable of hardening upon exposure to a laser. The plate is exposed with a laser, deactivated, and then on-press developed with ink and/or fountain solution. Alternatively, the plate is developed with ink and/or fountain solution or the like off press, and then mounted on press for lithographic printing. The deactivation or off-press development allows the plate to be handled on press under white light or other light which is unsafe for a non-deactivated plate.

Abstract: The present invention relates to a printed substrate comprising a substrate and a printing ink and is characterized in that at least one side of the substrate has a surface with a porosity of below 0.07 ml/g determined by the mercury porosimetry method, and it comprises an printing ink formulated as heat-set offset printing ink with reduced tack comprising at least one pigment and a mixture of at least two solvents boiling in the range of from 200° C. to 270° C.

Abstract: According to the present invention a non-ablative, negative-working, heat-sensitive printing plate precursor is disclosed capable of switching from a hydrophilic state into a hydrophobic state upon exposure to heat and/or infrared light. The printing plate precursor is obtainable by the method comprising the step of providing on a support a titanium oxide layer by reactive physical vacuum deposition of titanium, characterised in that said vacuum deposition is carried out under a partial oxygen pressure of 10% or more and less than 25%.

Abstract: The present invention provides an image forming method comprising the steps of exposing imagewisely an image forming material having a photosensitive layer comprising an infrared absorbing agent, a polymerization initiator and a polymerizable compound on a substrate to overlapping infrared beams. The solubility of the photosensitive layer in an alkali developing solution reduces upon exposure to light of wavelengths in the range of 750 nm to 1400 nm. The exposed image forming material is developed, and the infrared beam diameter used in light exposure is 20 ?m or less, and the overlapping coefficient is 0.8 or more.

Abstract: The present invention relates to negative-working imageable elements that can be used for the manufacture of printing plates. These imageable elements can be developed on on-press by the action of a lithographic printing ink used in combination with either water or a fountain solution. The imageable elements comprise an imageable layer that is not removable in water or fountain solution alone. The imageable layer includes a free radically polymerizable compound, a free radical initiator composition, an infrared radiation absorbing compound, and a polymeric binder comprising poly(alkylene oxide) pendant groups, and preferably additionally pendant cyano groups.

Abstract: A printed material as an embodiment of the invention comprising a substrate, partition walls for partitioning the surface of the substrate into a plurality of regions, and an ink film formed by printing in the plurality of regions by using a printer, in which the partition wall comprises an ink repellent material containing a resin binder and an ink repellent agent, the ink repellent agent is a compound having a site showing a compatibility with the resin binder and a site having an ink repellency, the ink repellent material includes a heated resin composition, the critical surface tension of the resin composition is from 30 to 40 mN/m, and the critical surface tension of the resin composition after heating the resin composition under the condition at 200° C. for 10 min is from 24 to 30 mN/m.

Abstract: Apparatus and methods for controlling application of a substance to a substrate involve the use of a functional agent that blocks the substance from or attracts the principal substance to the substrate. The apparatus and methods may utilize ink jet technology to apply the functional agent directly to the substrate or to an intermediate surface. The principal substance may be an ink, a dye, a marking substance other than an ink, or a carrier for any other type of substance.

Abstract: A method to obtain a lithographic printing master comprising: a) an imaginable element is formed from a radiation sensitive coating on a base, said coating comprising: (1) hydrophilic polymer particles; (2) hydrophobic polymer particles; and (3) a converter substance capable of converting radiation into heat; b) the imaginable element forms a hydrophilic layer on a base but it can not be removed by water or fountain used for press after coated and dried; c) image-wise or information-wise exposing to radiation, the hydrophilic imaginable element layer becomes hydrophobic for ink under the action of thermal laser and unexposed area remains hydrophilic for water. The converter substance may be selected to have an absorption spectrum that is optimized to absorb at the wavelength of imaging radiation. The hydrophilic polymer particles are made by polymerization of at least one hydrophilic monomer and the hydrophobic polymer particles are made by polymerization of at least one hydrophobic monomer.

Abstract: A method to obtain a lithographic printing master comprising: a) an imaginable element is formed from a radiation sensitive coating on a base, said coating comprising: (1) anionic polymer particles; (2) cationic polymer particles; and (3) a converter substance capable of converting radiation into heat; b) the imaginable element forms a hydrophilic layer on a base but it can not be removed by water or fountain used for press after coated and dried; c) image-wise or information-wise exposing to radiation, the hydrophilic imaginable element layer becomes hydrophobic for ink under the action of thermal laser and unexposed area remains hydrophilic for water. The converter substance may be selected to have an absorption spectrum that is optimized to absorb at the wavelength of imaging radiation. The anionic polymer particles have an anionic surface and cationic polymer particles have a cationic surface.