Hoechst Aktiengesellschaft

Hoeschst Aktiengesellschaft

Agfa-gevaert Ag

Agfa-gevaert

Afga-gevaert

Agfa Graphics Nv

Engelbert Pliefke

Raimund J Faust

Silvia Lutz

Werner Frass

Dieter Mohr

Andreas Elsaesser

Hans-Joachim Schlosser

Juergen Lingnau

Otfried Gaschler

Steffen Denzinger

Klaus-Peter Schoen

Fritz-Feo Grabley

Michael Brenk

Joerg Jung

Klaus Schmitt

Heinrich Kuhn

Gerhard Usbeck

Dieter Jaculi

Michael Dörr

Ulrich Bos

Günther Hultzsch

Peter Riedel

The invention relates to a recording material for the production of offset printing plates, having a web- or plate-form support, a radiation-sensitive layer on the front of the support and a continuous, pigment particle-free layer on the back of the support. The back layer essentially consists of an organic polymeric material having a glass transition temperature Tg of at least 45&#xb0; C., and its surface has a Bekk smoothness of from 5 to 800 s. It also relates to a process for the production of this recording material.

Radiation-sensitive recording material having a structured back

A positive-working, radiation-sensitive mixture which contains an organic, polymeric binder which is insoluble in water but soluble or at least swellable in aqueous alkaline solution and at least one IR-absorbing dye,

Radiation-sensitive mixture comprising IR-absorbing, anionic cyanine dyes and recording material prepared therewith

Thermal process for applying hydrophilic layers to hydrophobic

A support material for photosensitive substances, useful in the production of offset-printing plates, is disclosed. The support material comprises mechanically, chemically or electrochemically roughened aluminum or an aluminum alloy in the form of a sheet, a foil or a web, and which is coated on at least one side with a hydrophilic polymer which comprises (a) at least 2 mol% of units having acidic side groups and (b) at least 2 mol% of units having basic side groups which are capable of being protonated.

Support material for offset-printing plates in the form of a sheet, a

The invention relates to a hydrophilic copolymer having the general structure:

Hydrophilic copolymers and their use in reprography

The invention relates to a hydrophilic copolymer having the general structure: ##STR1## in which R.sup.1 denotes H, CH.sub.3 or C.sub.2 H.sub.5,

The invention relates to a thermally crosslinkable hydrophilic copolymer have the general structure:

Thermally crosslinkable hydrophilic copolymers and their use in

A process for roughening aluminum or alloys thereof for printing plate supports, wherein an electrochemical roughening is performed by means of alternating current in an acidic electrolyte including sulfate ions and chloride ions, the chloride ions being in the form of aluminum chloride. In a preceding or subsequent rougheniong stage, mechanical roughening and/or electrochemical roughening by means of alternating current in an electrolyte is carried out. The electrolyte can include hydrochloric acid and aluminum ions, nitric acid and aluminum ions or sulfuric acid and chloride ions.

Process for electrochemical roughening of aluminum for printing plate

A process is disclosed for the electrochemical roughening of aluminum for use in printing plate supports, which is carried out by means of an electrolyte containing sulfate ions and aluminum chloride; preference is given to sulfuric acid and aluminum chloride. Printing plate supports roughened by the process according to the present invention show a particularly uniform, pit-free and overall roughening structure.

Process for the electrochemical roughening of aluminum for use in

This invention relates to a single-stage process for imaging an electrically conductive substrate by the action of electric current, wherein the substrate is brought into contact with an electrically conductive solution of an organic substance, a direct voltage is applied between the substrate and at least one electrode, and the organic substance is deposited imagewise by current impulses, at a current density from 0.01 to 100 A/dm.sup.2. The organic substances used preferably comprise polymers.

Single-stage electrochemical image-forming process for reproduction

A process is disclosed for the selective additive correction of voids in copying layers, in which electrically conductive aqueous solutions of an organic compound are deposited in the void, with direct current connection between conductive substrate and at least one electrode, and with a current density in the range from 0.01 to 100 A/dm.sup.2. The process is preferably carried out using organic polymers with substrates composed of metal, for example, aluminum, in grained and anodized form.

Process for the selective additive correction of voids in copying layers

A process in disclosed for the multiple graining of aluminum or aluminum alloys for use in printing plate supports. In the process, mechanical graining is followed by graining with a direct current in a nitrate-containing electrolyte. Optionally, the graining is followed by an anodizing treatment.

Process for the electrochemical graining of aluminum for use in printing

A process for electrochemically modifying support materials of aluminum or aluminum alloys, which have been grained in a multi-stage process is disclosed. These support materials can be used in the production of offset printing plates. The support material is mechanically grained in a stage I, subjected to an intermediate treatment in a stage II, electrochemically grained in a stage III, subjected to an intermediate treatment in a stage IV and anodically oxidized in a stage V. The intermediate treatment in stages II and/or IV are carried out by an electrochemical process using a direct current. The anodizing stage may be followed by a hydrophilizing stage VI.

Process for electrochemically modifying support materials of aluminum or

In a process for reducing halations during the imagewise irradiation of a reproduction layer exposed through a planar image original, at least one lubricant either is contained in the layer or is interposed between the layer and the image original. Suitable lubricants include organic polysiloxanes, hydrocarbon polymers, polyaryl esters, and alkanoic acids or alkenoic acids having at least 9 carbon atoms. Excluded are lubricants comprising copolymers of dimethyl dichlorosilane, ethylene oxide and propylene oxide, provided they are located in the reproduction layer.

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Wiesbaden, Germany

Engelbert Pliefke