Hoechst Aktiengesellschaft

Agfa-gevaert

Agfa Gevaert Nv

Agfa-gervert

Peter Lehmann

Joachim Stroszynski

Raimund Haas

Franz Durst

Werner Interthal

Gerhard Mack

Manfred Dammann

Guenter Hultzsch

Andreas Els&auml;sser

Manfred Michel

Heinz Boergerding

Herbert Zeisel

Dieter Mohr

Georg Pawlowski

Andreas Elsaesser

Raimund J Faust

Rudolf Zertani

Klaus Joerg

Steffen Denzinger

Fritz-Feo Grabley

Rudolf Neubauer

Hans Heist

Kurt Reiss

Michael D&ouml;rr

Cornelia Alba

Klaus J&ouml;rg

G&uuml;nther Hultzsch

The invention relates to a radiation-sensitive recording material for the production of offset printing plates having a dimensionally stable support, a radiation-sensitive layer located on the front of the support, and a layer which comprises an organic polymeric material having a glass transition temperature of 35&deg; C. or above and in which pigment particles are embedded and which is resistant to processing chemicals and is located on the back of the support. The pigment particles are preferably silica gel particles having a mean diameter of from 0.1 to 50 &mgr;m or organic particles having a mean diameter of from 3 to 10 &mgr;m. The image layer on the front may be matted or pigmented. The back coating enables the recording material to be stacked without separating paper. The image layer located on the front is not scratched by the pigmented back coating during storage and transport and during removal from the stack.

Presensitized printing plate with pigmented back coating

A dummy plate is provided for offset printing which essentially consists of a plate-, sheet- or band-form, mechanically and/or electro-chemically roughened, anodically oxidized and optionally hydrophilized aluminium support and a non-photosensitive, water-soluble protective layer applied thereto, characterized in that the layer contains a water-soluble organic compound which contains at least one OH- or NH-acidic group having a pKa value of &lE;8 as acid or salt, and has a layer thickness which is smaller than the average roughness ra of the support material, determined by optical means. Even after extended storage at elevated temperature, the dummy plate can easily be used without an additional development step and exhibits no tendency to stick.

Coated dummy plates

A positive-working, radiation-sensitive recording material capable of being used for the production of planographic printing plates, comprising: an aluminum support and a radiation-sensitive layer coated thereon, wherein

Radiation-sensitive recording material for the production of

A dummy plate for offset printing comprising essentially a mechanically and/or electrochemically roughened, anodically oxidized and hydrophilized aluminium support in the form of a plate, sheet or band and a non light-sensitive, water-soluble layer coated thereon, and characterized in that the layer contains at least one organic polymer with a water-solubility of at least 2 g/L at room temperature and at least one inorganic compound reacting as an acid.

Dummy plate for offset printing

A mechanically roughened substrate is conveyed through an electrolytic bath and is given a superposed electrochemical roughening, which is carried out by means of electrodes which are arranged in the electrolytic bath at a specific spacing from the substrate. The electrodes are connected to corresponding windings on the secondary side of a three-phase transformer. The corresponding windings on the primary side of the three-phase transformer are connected to a three-phase frequency converter, to which three-phase current is applied via leads. The three-phase frequency converter transforms the line frequency of the three-phase current supplied into a frequency range of about 50 to 300 Hz at a voltage of between about 1 and 380 V.

Apparatus for roughening a substrate for photosensitive layers

An apparatus for applying a fluid to a moving carrier strip includes a distributor and a plurality of individual flow channels which together form a multi-jet nozzle. The individual flow channels in the form of capillary tubes are arranged at right angles to the distributor axis at equal distances along a longitudinal line parallel to the distributor axis. The capillary tubes protrude into an internal chamber of the distributor and the capillary tube located at each end of the longitudinal line protrudes further into the interior of the distributor than the other capillary tubes.

Apparatus for applying a fluid under hydrostatic pressure to a moving

A distributor tube has tube slots in its shell surface transversely of the inflow direction of a fluid into the distributor tube. A casing tube is enclosed by the distributor tube and is divided into flow chambers, each of which is bounded by two annular plates and connected to an inlet sector. A star-shaped volume flow divider is located on the inlet side of the distributor tube as a tube insert, which divides the introduced mass flow rate into partial flow rates for the flow chambers. In another embodiment, the distributor tube encloses a rotationally symmetric pressure distributor, whereby the fluid within the distributor tube encounters equal pressure in the radial and axial flow directions over the inlet length of the distributor tube.

Process for the uniform introduction of a fluid, and apparatus for

Process and apparatus for roughening a substrate for photosensitive

A process for drying a liquid layer which has been applied to a carrier material moving through a drying zone and which contains vaporizable solvent components and non-vaporizable components, wherein a drying gas flows in the longitudinal direction of the carrier material parallel to the liquid layer and is accelerated in the drying zone in the direction of flow, is disclosed. Also disclosed is a device for accomplishing the drying process, comprising a drying channel through which the carrier material bearing the liquid layer runs in the longitudinal direction, and a gas-permeable channel-covering surface, through which the gas stream flows into the drying channel.

Process and device for drying a liquid layer applied to a moving carrier

A photosensitive recording material with a layer base and a photosensitive layer, which essentially contains a diazonium salt polycondensation product, a polymeric binder which is insoluble in water and soluble in organic solvents and soluble or at least swellable in aqueous alkaline solutions, a polymerization initiator which forms free radicals when exposed to actinic radiation and a polymerizable ethylenically unsaturated compound containing at least one unsaturated group and having a boiling point at normal pressure of over 100.degree. C., wherein the recording material contains, between the photosensitive layer and the layer base, a photosensitive intermediate layer which essentially contains a diazonium salt polycondensation product and a polymeric binder which is insoluble in water and soluble in organic solvents and soluble or at least swellable in aqueous alkaline solutions.

Photosensitive diazo and photopolymerizable recording material with a

The disclosed light-sensitive recording material is composed of an electrically conductive support, suitable for the production of printing forms or printed circuits, an a photoconductive layer system containing a photoconductor, a binder, a sensitizing dye and conventional additives. The photoconductive system comprises (A) a single photoconductive layer, or multiple layers, applied to the support and (B) a light-sensitive covering layer which contains at least one photochemically reactive compound. The use of the recording material in a process for the production of printing forms and printed circuits is also disclosed.

Light-sensitive photoconductive recording material with light sensitive

The disclosed light-sensitive recording material is composed of an electrically conductive support, suitable for the production of printing forms or printed circuits, and a photoconductive layer system containing a photoconductor, a binder, a sensitizing dye and conventional additives. The photoconductive system comprises (A) a single photoconductive layer, or multiple layers, applied to the support and (B) a light-sensitive covering layer which contains at least one photochemically reactive compound. The use of the recording material in a process for the production of printing forms and printed circuits is also disclosed.

Light-sensitive recording material for the production of a printing form

The present invention describes a light-sensitive copying material comprising a support and a light-sensitive layer which contains from 0.01 to 10 percent by weight of a non-ionic ester which is obtained by reacting a perfluoro-carboxylic acid with a polyalkylene glycol or of an ether which is obtained by reacting a highly fluorinated or a perfluorinated alkanol with a polyalkylene glycol. By the addition of the fluorinated compound, a more uniform coating is achieved, even when one solvent alone is used for the coating solution.

Light-sensitive copying material and process for the manufacture thereof

This invention relates to an improvement in a photopolymerizable mixture, comprising a polymeric binder which is soluble or at least swellable in aqueous-alkaline solutions, a compound with at least two acrylic or methacrylic acid ester groups and a boiling point above 100.degree. C. which is capable of addition polymerization, a photoinitiator, and a plasticizer, the improvement being that the plasticizer is a compound corresponding to Formula I ##STR1## wherein R.sub.1 is a hydrogen or halogen atom or an alkyl group with 1 to 4 carbon atoms, R.sub.2 is a hydrogen atom, an OH group, or an alkyl group with 1 to 4 carbon atoms, R.sub.3 is a hydrogen atom or a methyl group, R.sub.4 is an alkyl or alkenyl group with 1 to 20 carbon atoms, and n is zero or a whole number from 1 to 20, and wherein R.sub.4 has at least 4 carbon atoms if n is zero or 1. The invention also relates to a light-sensitive transfer material including the photopolymerizable mixture.

Growing community of inventors

Kelkheim, Germany

Peter Lehmann