American Hoechst Corporation

Hoechst Celanese Corporation

Thomas N Gillich

John E Walls

Stanley F Wanat

William J Rozell

Carlton D Mappin

The invention provides a cleaner for lithographic printing plates free of aromatic hydrocarbons consisting essentially of from about 3.0% to about 35.0% of a solvent component which is selected from the group consisting of ethoxylates and propoxylates of C.sub.1 to C.sub.4 alcohols; and from about 0.5% to about 7.0% sodium metasilicate; and from about 0.25% to about 6.0% of a non-ionic surfactant selected from the group consisting of polyoxy aryl ethers having a hydrophile-lipophile balance in the range of from about 10.5 to about 11.5; and from about 52.0% to about 96.25% water, wherein the percentages are by weight of the cleaner.

Cleaner for lithographic printing plates free of aromatic hydrocarbons

The invention provides a cleaner for lithographic printing plates free of aromatic hydrocarbons consisting essentially of from about 3.0% to about 35.0% of a solvent component which is selected from the group consisting of ethoxylates and propoxylates of C.sub.1 to C.sub.4 alcohols; and from about 0.5% to about 7.0% sodium metasilicate; and from about 0.25% to about 6.0% of a non-ionic surfactant selected from the group consisting of polyoxy aryl ethers having a hydrophile-lipophile balance in the range of from about 10.5 to about 11.5; and from about 52.0% to about 96.25% water, wherein said percentages are by weight of the cleaner.

Cleaner for lithographic printing plates

A wash water reclamation system for a printing plate processor having an external reservoir, wash water pumping and collecting means and means for continuously measuring wash water pH and conductivity. Conductivity and pH are automatically adjusted at pre-determined levels.

Printing plate processor having recirculating water wash reclamation

A composition for correcting scratches on the non-image areas of a metal based lithographic printing plate which contains trisodium phosphate, sodium metasilicate, an anionic surfactant and water.

Scratch corrector for lithographic printing plates

According to the invention there is provided an electrochemical process for applying a firmly bonded insoluble metal oxide-organic complex on a metal surface by employing the metal as anode and a water-soluble polybasic organic acid as electrolyte. The polybasic acid may be a polyphosphonic acid, polyphosphoric and polycarboxyl acid, or polysulfonic acid and is advantageously polymeric. Polyvinyl phosphonic acid (PVPA) is a preferred electrolyte. Direct current is used. The insoluble metal oxide-organic complex formed is composed of anodic oxide combined with polyacid, which forms a protective layer on the metal of improved corrosion resistance. The metal oxide-organic complex is well-suited to bond light sensitive coatings thereto. The metal may be steel, aluminum or magnesium. The process is economical and the product novel.

Electrolytes for electrochemically treated metal plates

According to the invention there is provided an electrochemical process for applying a firmly bonded insoluble metal oxide-organic complex on a metal surface by employing the metal as anode and a water-soluble poly basic organic acid as electrolyte together with a strong inorganic acid such as phosphoric acid or further admixed with another strong inorganic acid such as sulfuric. The polybasic acid may be a polyphosphonic acid, polyphosphoric and polycarboxyl acid, or polysulfonic acid and is advantageously polymeric. Polyvinyl phosphonic acid (PVPA) is a preferred electrolyte. Direct current is used. The insoluble metal oxide-organic complex formed is composed of anodic oxide combined with polyacid, which forms a protective layer on the metal of improved corrosion resistance. The metal oxide-organic complex is well-suited to bond light sensitive coatings thereto. The metal may be steel or aluminum. The process is economical and the product novel.

Electrochemically treated metal plates

According to the invention there is provided an electrochemical process for applying a firmly bonded insoluble metal oxide-organic complex on a metal surface by employing the metal as anode and a water-soluble polybasic organic acid as electrolyte. The polybasic acid may be a polyphosphonic acid, polyphosphoric and polycarboxyl acid, or polysulfonic acid and is advantageously polymeric. Polyvinyl phosphonic acid (PVPA) is a preferred electrolyte. Repetitive cycle pulsed direct current is used. The insoluble metal oxide-organic complex formed is composed of anodic oxide combined with polyacid, which forms a protective layer on the metal of improved corrosion resistance. The metal oxide-organic complex is well-suited to bond light sensitive coatings thereto. The metal may be steel, aluminum or magnesium.

Novel electrolytes for electrochemically treated metal plates

The invention is directed to the electrochemical treatment of aluminum substrates in a non-aqueous solution of a polybasic organic acid to provide a surface complex which promotes the adhesion of subsequently applied coatings to said surface.

Aluminum electrolysis in non-aqueous monomeric organic acid

According to the invention there is provided an electrochemical process for applying a firmly bonded insoluble metal oxide-organic complex on a metal surface by employing the metal as anode and a water-soluble poly basic organic acid as electrolyte together with a strong inorganic acid such as phosphoric acid or further admixed with another strong inorganic acid such as sulfuric. The polybasic acid may be a polyphosphonic acid, polyphosphoric and polycarboxyl acid, or polysulfonic acid and is advantageously polymeric. Polyvinyl phosphonic acid (PVPA) is a preferred electrolyte. Direct current is used. Pulsed plating may optionally be employed. The insoluble metal oxide-organic complex formed is composed of anodic oxide combined with polyacid, which forms a protective layer on the metal of improved corrosion resistance. The metal oxide-organic complex is well-suited to bond light sensitive coatings thereto. The metal may be steel or aluminum. The process is economical and the product novel.

The invention is directed to the electrochemical treatment of aluminum substrates in a non-aqueous solution of a polymeric polybasic organic acid to provide a surface complex which promotes the adhesion of subsequently applied coatings to said surface.

Electrochemical treatment of aluminum in non-aqueous polymeric polybasic

An aqueous nonblinding lithographic plate finisher suitable for machine operation is provided which comprises an essentially cold-water soluble dextrin or polyvinyl pyrrolidone as hydrophilic polymer with a nonionic surfactant or mixture thereof having a hydrophile-lipophile balance between about 12 and 18, a humectant and a salt.

Lithographic plate finisher

A composition for finishing lithographic printing plates having an oil phase which preferentially adheres to the image areas and an aqueous phase which desensitizes the metal carrier and aids in maintaining its hydrophilic character upon storage.

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Whitehouse Station, NJ, United States of America

Thomas N Gillich