Polychrome Corporation

Sun Chemical Corporation

Jen-chi Huang

Eugene Golda

Nils Eklund

Alan Leonard Wilkes

Simon L Chu

James Shelnut

Donald J Riley

Gregory Von Gruenberg

Daniel Bourgeois

Daniel M Bourgeois

Hans P Herting

A process is disclosed to produce a fine honeycomb grain with matte finishing on an aluminum surface in alkaline solution with or without electrical treatment. To achieve the fine honeycomb, a passivation enhancement step is used prior to alkaline etching with or without electricity. The matte appearance with fine honeycomb topography on the aluminum surface is produced by silicating raw aluminum prior to alkaline etching.

Process for the surface treatment of lithographic printing plate

An all electrolytic method for quickly and efficiently producing a well roughened, substantially non-directional, fine honeycomb surface on an aluminum sheet which is characterized by excellent adhesion to coatings and therefore suitable for making lithographic printing plates. The method comprises graining said aluminum sheet with alternating current for less than about 10 seconds in a first aqueous electrolyte solution containing hydrochloric acid, washing and drying the resulting grained aluminum sheet, and then further graining said dried aluminum sheet with alternating current for less than about 10 seconds, preferably 5 to 10 seconds, in a second aqueous electrolyte solution containing nitric acid alone or admixed with hydrochloric acid to obtain the substantially non-directional, fine honeycomb surface on said aluminum sheet.

Two-step method for electrolytically graining lithographic metal plates

A method of preparing an anodized aluminum printing plate comprising treating the aluminum support with aqueous solution of a condensed aryl sulfonic acid having a neutral pH, anodizing the support before or after the treating step, and coat, radiation expose through a mask, as well as develop a radiation-sensitive composition to produce the lithographic printing plate.

Method for preparing and using an anodized aluminum photo-lithographic

An improved planographic printing plate comprised of a metal substrate, a sealing layer, an interlayer formed from a monomer or polymer of an organic compound having at least one cationic, quaternary substituted ammonium group, and a photosensitive layer on the surface of the interlayer. The printing plates are water developable and characterized by cleaner non-imaging areas during printing operations. The method of preparing such planographic printing plates is also described and illustrated.

Planographic printing plate having cationic compound in interlayer

A method is provided for electrolytically graining an aluminum lithographic plate to produce a grained surface with a honeycomb topography, non-directional grain structure, and a substantially reduced production of smut. The reduction of smut is achieved by utilizing an alternating current of higher frequencies, generally in the range of approximately 140 to 400 Hz.

Method of electrolytically graining a lithographic plate

The method of production of lithographic aluminum substrates which comprises first mechanically graining a surface of an aluminum sheet to obtain a pumice grained surface and then etching with a hot sulfuric acid (10-90%) solution.

Chemical etching of lithographic aluminum substrate

An improved planographic printing plate comprised of a metal substrate, a sealing layer, an interlayer formed from a monomer or polymer of an organic compound having at least one cationic, quaternary sustituted ammonium group, and a photosensitive layer on the surface of the interlayer. The printing plates are water developable and characterized by cleaner non-imaging areas during printing operations. The method of preparing such planographic printing plates is also described and illustrated.

Planographic printing plate

A method for the production of aluminum substrates useful in the production of lithographic printing plates which comprises first mechanically graining at least one surface of an aluminum sheet to obtain a pumice grained surface of the aluminum sheet, and then electrolytically etching said grained surface with alternating current.

Aluminum substrates useful for lithographic printing plates

A planographic printing plate comprises an anodized metal substrate, an interlayer on the substrate and a photosensitive layer on the interlayer in which the interlayer is a hydroxy-substituted organic acid.

Acid interlayered planographic printing plate

An improved anodized support material comprising an anodized support material which has been treated with an alkali metal salt of a condensed aryl sulfonic acid following or during anodization; an improved radiation sensitive element comprising the above improved supports to which has been applied a radiation-sensitive composition and improved lithographic printing plates prepared from said elements.

Anodized supports and radiation sensitive elements therefrom

In the method of electrolytically treating a lithographic-grade aluminum web by liquid contact in a sulfuric acid electrolyte, the improvement which comprises carrying out said treatment in the presence of an iridium oxide plated titanium metal anode.

Anodization method

A method for the production of aluminum substrates useful in the production of lithographic printing plates which comprises mechanically graining the surface of an aluminum sheet, subsequently finely graining the mechanically grained sheet in a saturated solution of an aluminum salt of a mineral acid to which up to 10% of a mineral acid has been added, with discretional electrolysis, and then optionally anodizing the sheet.

Growing community of inventors

Ossining, NY, United States of America

Jen-chi Huang