Abstract: The lithographic printing plate of the invention comprises a substrate having a hydrophilic surface, a coating on said surface of a light sensitive material (e.g., a water soluble diazo) and a top coating of discrete, oleophilic resin particles (e.g., an emulsion polymer), the resin particle coating being:(a) transparent to actinic light;(b) sufficiently permeable to allow a developer for the light sensitive material to penetrate through to the underlying light sensitive coating;(c) insoluble in said developer;(d) capable of being coalesced in situ after the plate is imaged and developed.

Abstract: A security medium, secure articles made therefrom and methods of making same. Articles are disclosed which are resistant to counterfeiting and unauthorized alteration and which are suitable for use as currency, securities, security passes, identification cards, and analogous items now usually manufactured on paper. The novel articles comprise two synthetic material layers with a barrier layer therebetween and an image formed from sublimatable dye within at least one of the synthetic layers.

Abstract: The lithographic printing plate of the invention comprises a substrate having a hydrophilic surface, a coating on said surface of a light sensitive material (e.g., a water soluble diazo) and a top coating of discrete, oleophilic resin particles (e.g., an emulsion polymer), the resin particle coating being:(a) transparent to actinic light;(b) sufficiently permeable to allow a developer for the light sensitive material to penetrate through to the underlying light sensitive coating;(c) insoluble in said developer;(d) capable of being coalesced in situ after the plate is imaged and developed.

Abstract: Lithographic printing plates are made by exposing to actinic light a lithographic plate having a water soluble light sensitive layer thereon and a coating of a solvent soluble, UV curable material thereover to form an image in the light sensitive layer and adhere said layer to the overlying UV curable material. The plate is developed with water to remove light sensitive layer and overlying UV curable material in the non-image areas, and the plate is exposed to UV source having an intensity greater than the imaging light to form a press-ready plate having a durable, reinforced cured image thereon.

Abstract: Process for making a lithographic printing plate having an oleophilic amplified image prepared by(a) providing a silicated aluminum substrate with a hydrophilic, anionic, negatively charged surface and a layer on said surface of a light sensitive, cationic, positively charged, water soluble diazonium material having at least two reactive sites per molecule, each reactive site being capable of being chemically altered by actinic light or chemically reacted with an anionic material;(b) selectively and incompletely exposing the diazo layer to actinic light to alter only a portion of the reactive sites thereby adhering the diazo material to the substrate in the exposed areas;(c) coupling the diazo layer with an anionic material to reinforce diazo in the exposed areas in situ and remove diazo from the unexposed areas by contacting the substrate after exposure with an anionic material in water in a quantity and for a time sufficient to couple the anionic material with the diazo and dissolve the coupled product from

Abstract: Lithographic printing plates are made by exposing to actinic light a lithographic plate having a water soluble light sensitive layer thereon to form an image in said layer. A solvent soluble, UV curable material is adhered to the image in said layer. The plate is developed before or after applying the UV curable material. The plate is exposed to UV source having an intensity greater than the imaging light to form a press-ready plate having a durable, reinforced cured image thereon.

Abstract: Process for removing unexposed diazo from a silicated aluminum lithographic printing plate having a hydrophilic, anionic, negatively charged surface and a layer of a light sensitive, cationic diazo material which has been selectively exposed to actinic light in an image area. The plate is contacted after exposure with a solution of an anionic material in water. Anionic material from the solution ionically couples with unexposed diazo material and the solution still containing anionic material dissolves the coupled product from the unexposed areas producing a clean, hydrophilic background.

Abstract: Lithographic printing plates are made by exposing to actinic light a lithographic plate having a water soluble light sensitive layer thereon and a coating of a solvent soluble, UV curable material thereover to form an image in the light sensitive layer and adhere said layer to the overlying UV curable material. The plate is developed with water to remove light sensitive layer and overlying UV curable material in the non-image areas, and the plate is exposed to UV source having an intensity greater than the imaging light to form a press-ready plate having a durable, reinforced cured image thereon.

Abstract: Lithographic printing plates are made by exposing to actinic light a lithographic plate having a water soluble light sensitive layer thereon to form an image in said layer. A solvent soluble, UV curable material is adhered to the image in said layer. The plate is developed before or after applying the UV curable material. The plate is exposed to UV source having an intensity greater than the imaging light to form a press-ready plate having a durable, reinforced cured image thereon.

Abstract: Method for lithographic printing wherein a lithographic printing plate having oleophilic and hydrophilic areas on the printing surface of the plate is contacted with ink and an aqueous fountain solution during printing. An aqueous solution comprising an enzyme is used as the fountain solution.

Abstract: Aluminum substrate suitable for making lithographic plates which has been treated to render the surface hydrophilic and negatively charged and thereafter ionically colored with a cationic dye.

Abstract: Anodized aluminum having a porous, unsealed anodic oxide layer is provided with a polymeric coating over the oxide layer that is substantive to a sublimatable dye. A sublimated dye forms a design or image in the oxide layer and the polymeric coating. Single and multi-color designs and images can be used for nameplates, dials and signs.

Abstract: Planar surfaces are roughened by graining with an aqueous slurry of unfused platy, crystalline alumina. Preferably, an aluminum base with is adapted to receive a light-sensitive coating thereon to make lithographic plate is grained with said aqueous slurry.

Abstract: Aluminum foil in the form of a continuous web for example, is anodically oxidized by first coating one side of the web with a material such as a polymeric material which is inert to the anodizing conditions and then electrolytically anodizing the uncoated side of the web. The laminate formed which can be used as a base plate for presensitized and wipe-on lithographic printing plates includes an aluminum foil coated on one side with an inert material and having an anodically oxidized layer on the other side which is formed after the one side is coated with the inert material.

Abstract: A lithographic printing plate system utilizing a composite plate having an aluminum printing member that can be recycled. An aluminum printing member has a light-sensitive coating thereon which forms the image area of the plate together with the aluminum member itself. A carrier plate supports the aluminum member. The carrier plate and the aluminum member are preferably releasably adhered together outside the image area of the plate, that is, along transverse and/or longitudinal edge positions adjacent the image area. The aluminum member is readily separated from the carrier plate for recycling after the printing run and the carrier plate can be reused or recycled.

Abstract: Aluminum foil in the form of a continuous web for example, is anodically oxidized by first coating one side of the web with a material such as a polymeric material which is inert to the anodizing conditions and then electrolytically anodizing the uncoated side of the web. The laminate formed which can be used as a base plate for presensitized and wipe-on lithographic printing places includes an aluminium foil coated on one side with an inert material and having an anodically oxidized layer on the other side which is formed after the one side is coated with the inert material.

Abstract: An article having an aluminum substrate, an unsealed, porous anodic oxide layer thereon and electrolytically deposited, randomly distributed discrete metal islands having a root portion anchored in one or more pores of the oxide layer. The metal islands extend from the root portion above the surface of the oxide layer in a bulbous, undercut configuration.A process for treating aluminum is also disclosed and includes the steps of electrolytically anodizing aluminum surfaced articles to form an unsealed, porous anodic oxide layer thereon followed by electrolytically depositing randomly distributed discrete metal islands in the pores of the oxide layer and extending above the surface thereof in the bulbous, undercut configuration.

Abstract: Metal powders are made by electrolytically depositing discrete metal particles in the pores of a porous oxide surface of an anodized aluminum article followed by liberation of the metal particles by contact with a substance that will attack, e.g. dissolve, the oxide surface but not the metal particles.

Abstract: Aluminum is continuously anodized using direct current in an anodizing cell having a cathode connected to the source of direct current which is succeeded by a cathodic contact cell having an anode connected to the same source of direct current. The anodizing direct current is introduced into the aluminum in the contact cell, the aluminum having an anodized oxide coating formed thereon in the anodizing cell before entering the contact cell.