Hoechst Aktiengesellschaft

Agfa-gevaert Ag

Hoeschst Aktiengesellschaft

Werner Frass

Dieter Mohr

Andreas Elsaesser

Klaus Rode

Engelbert Pliefke

Joachim Gersdorf

Hans-Joachim Schlosser

Rudolf Zertani

Klaus Joerg

Loni Schell

Otfried Gaschler

Guenter Jung

Guenther Schoen

Jutta Bachstein

Stephan J Platzer

Walter Herwig

Klaus Horn

Guenter Hultzsch

Willi-Kurt Gries

Gerhard Mack

Fritz-Feo Grabley

Klaus-Peter Konrad

Gerhard Usbeck

Heinrich Kuhn

Reinhold Arneth

Dieter Jaculi

Ulrich Bos

Dieter Bosse

Gunter Berghaeuser

Inge Gros

Birgit Mueller

Eberhard Hehl

Trutz-Ulrich Stephani

Britta Maisel

Gabor Jerling

Thermal process for applying hydrophilic layers to hydrophobic

The invention describes a photopolymerizable recording material which comprises a photopolymerizable layer and a cover layer. The cover layer comprises a polymer which possesses low permeability to atmospheric oxygen and is soluble in water, and a water-soluble dye which absorbs light in the region from 300 to 700 nm and within this range has a non-absorbent region corresponding to the emission range of the copying light source. The material can be sensitized for various spectral regions, for example, for UV light, visible light or laser light and has a higher resolving power than a corresponding material which does not contain a dye in the cover layer, while its photosensitivity remains unchanged or is only slightly reduced.

Photopolymerizable recording material

A process for developing irradiated radiation-sensitive recording materials using an aqueous-alkaline developer which contains compounds of the formula (I) ##STR1## wherein A is H, Na, K, NH.sub.4 or NR.sub.4, where

Developer for irradiated radiation-sensitive recording materials

A photosensitive recording material is described which has a layer base, a negative-working photosensitive layer containing a diazonium salt and a water-insoluble polymeric binder which is soluble or swellable in aqueous alkaline solutions, and a discontinuous top layer which forms a rough surface and which is composed of particles of a water-insoluble polymer which is dispersible in water in the presence of anionic or anionic/nonionic dispersants and which has a content of free acid groups or acid groups neutralized by salt formation of less than 0.8 mmol/g, the mean height of the particles being 2 to 6 .mu.m, the maximum height less than 10 .mu.m, the mean horizontal diameter less than 40 .mu.m, the maximum diameter less than 80 .mu.m and the number of particles being 100 to 10,000 per cm.sup.2. The material is suitable for the production of planographic printing plates and requires only short vacuum times in a vacuum-operated copying frame. The material can be developed without residue after exposure, the rough surface remaining intact at the image areas.

Photosensitive recording material containing negative working diazonium

An electrophotographic recording material comprising:

Electrophotographic recording material for the production of printing

A process for the production of a lithographic printing plate is described, in which a photosensitive material comprising a substrate suitable for lithographic printing, a hydrophilic intermediate layer, a photopolymerizable layer which changes its adhesion to the hydrophilic layer and/or to the cover sheet on exposure to light and a transparent cover sheet provided with an exposure mask which is non-transparent to actinic light is exposed to actinic light through the exposure mask, and the photopolymerizable layer is developed to give the image by peeling off the cover sheet from the substrate. The process is carried out in all stages without the use of chemicals and gives printing plates having good oleophilic properties and a long press life.

Process for the production of a lithographic printing plate through

Process for developing irradiated radiation-sensitive recording materials

The invention relates to a non-continuous matte layer that can be used with a recording material having a substrate and a radiation-sensitive layer which contains a 1,2-naphthoquinone-2-diazide and an organic, polymeric binder which is insoluble in water but soluble in aqueous alkaline solutions. This matte layer comprises 100 to 10,000 particles per square centimeter which have a mean diameter of less than 40 .mu.m and a maximum diameter of less than 80 .mu.m and a mean height of 2 to 6 .mu.m and a maximum height of 10 .mu.m, and contains a resin which has up to 0.80 mmol of acid groups and/or salt groups per gram. The matte layer is obtained by spraying on and drying an aqueous, anionically or anionically/nonionically stabilized dispersion of the resin.

Matted, radiation-sensitive recording material and printing plate

The invention describes a solvent mixture for photohardenable compositions, which includes

Negative-working photosensitive coating solution containing

The invention describes a developing solvent for layers which are crosslinkable by photopolymerization and contain a binder based on an elastomeric polymer, a photopolymerizable monomer compatible therewith and a photoinitiator. The developing solvent comprises a phenol ether of the general formula I ##STR1## wherein R.sup.1 denotes (C.sub.1 -C.sub.6)n-alkyl or iso-alkyl, cycloalkyl or (C.sub.6 -C.sub.12)-aryl and

Developing solvent for layers which are crosslinkable by

A photopolymerizable mixture is described, which contains a polymeric binder; an acrylate or alkacrylate of a polyhydric alcohol possessing at least one photooxidizable group; a compound or a combination of compounds being capable of initiating the polymerization of the ester under the action of light in the spectral region of 450 nm to 650 nm; and at least one compound which absorbs light in the region below 450 nm or which upon exposure forms a compound absorbing light in said region, whereby the optical density of the exposed mixture in this region is at least 2.0 at a layer thickness of 2 .mu.m. The mixture is useful for the production of masters or intermediate masters for reprographic layers being sensitive to light in the UV region, exposure of the mixture itself being performed with visible light.

Photopolymerizable mixture and recording material prepared therefrom,

A photopolymerizable mixture is disclosed which comprises

Photopolymerizable mixture, and a recording material produced therefrom

Process for the production of relief forms with a developing solvent

The invention relates to a positive-working radiation-sensitive mixture and a copying material produced therefrom on a layer support. The mixture contains as essential constituents a 1,2-quinone diazide or a combination of:

Radiation-sensitive positive working composition and copying material

A photopolymerizable mixture is described comprising (a) a polymeric binder, (b) an acrylate or alkacrylate of a polyhydric alcohol, said compound being free of urethane groups and further comprising at least one group which is photooxidizable on exposure to actinic radiation in the presence of a photoreducible dye, (c) a photoinitiator comprising a photoreducible dye, (d) a second photoinitiator comprising a trihalomethyl compound capable of being cleaved by irradiation, and (e) a third photoinitiator comprising an acridine, phenazine or quinoxaline compound. The mixture is suitable for the production of printing plates and photoresists and displays increased photosensitivity.

Photopolymerizable composition comprising (meth)acrylates with

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Wiesbaden, Germany

Werner Frass