Agfa-gevaert Ag

Hoechst Aktiengesellschaft

Agfa Gevaert Nv

Afga-gevaert

Otfried Gaschler

Andreas Elsaesser

Dieter Mohr

Werner Frass

Hans-Joachim Schlosser

Klaus Joerg

Hans W Frass

Fritz-Feo Grabley

Joerg Jung

Gerhard Buhr

Paul Stahlhofen

Engelbert Pliefke

Franz Durst

Gabor I Koletar

Guenter Hultzsch

Mathias Eichhorn

Douglas A Seeley

Klaus-Peter Konrad

Thomas Leichsenring

Helmut Haberhauer

Andreas Elsaessser

Guenter Hutzsch

Guenter Brenn

Radiation-sensitive mixtures comprising IR-absorbing cyanine dyes having a betaine structure or having a betaine structure and containing an anion, and recording materials prepared therewith

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

A positive-working or negative-working radiation-sensitive mixture includes as an IR absorbing component a carbon black pigment having a primary particle size smaller than 80 nm. The carbon black pigment is predispersed in a polymer containing acidic units having a pK.sub.a of less than 13. The radiation-sensitive component may include an ester of (i) a 1,2-naphthoquinone-2-diazide-4-sulfonic acid or a 1,2-naphthoquinone-2-diazide-5-sulfonic acid and (ii) a compound having at least one phenolic hydroxyl group, such as 3 to 6 phenolic hydroxyl groups. After imagewise radiation exposure, the recording material including the radiation-sensitive mixture can be developed without difficulties in an aqueous alkaline solution without leaving residual coating on the areas that became soluble or that remained soluble upon exposure.

Radiation-sensitive mixture and recording material made thereof for

The invention relates to a sheet-like radiation-sensitive recording material whose surface is a discontinuous dulling layer comprising monodisperse particles is present. The dulling layer can be produced by spraying on a dulling liquid. An apparatus comprising an oscillation generator, which can transmit oscillations to the liquid in the apparatus, and has an orifice plate which has at least one hole with a diameter of from 5 to 250 .mu.m and from which the liquid emerges in the form of at least one laminar free jet which disintegrates into monodisperse drops is suitable for this purpose. The oscillation generator is preferably a piezoelectric ceramic.

Dulled radiation-sensitive recording material and process for its

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

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 relates to a usually positive-working radiation-sensitive mixture which contains as essential components a binder which is insoluble in water and soluble in aqueous-alkaline solutions, a 1,2-quinone diazide and a compound which diminishes the developer solubility of the exposed regions by heat treatment, in which the compound which diminishes the developer solubility which is present is at least one urethane of the formula I: ##STR1## in which R.sub.1 is hydrogen or methyl,

Positive-working 1,2-quinone diazide radiation-sensitive mixture and

A process for producing negative copies is disclosed in which a light-sensitive or radiation-sensitive recording material comprising a layer support and a normally positive-working light-sensitive or radiation-sensitive layer applied thereto is irradiated imagewise, thermally treated, irradiated overall and then developed with an alkaline developer. Thermal treatment is carried out with water or with an aqueous solution, at temperatures in the range from about 50.degree. to 100.degree. C., preferably from 60.degree. to 90.degree. C., within a period of time varying between about 1 second and 5 minutes, preferably between 5 seconds and 1 minute, overall irradiation is performed on the optionally still hot recording material and development is thereafter carried out within a period of time varying between about 10 seconds and 2 minutes, preferably between 15 seconds and 1 minute. The process can be carried out according to the customary procedure known in the practice of positive processing, and results in perfect printing stencils.

Process for producing negative copies

The invention relates to a photosensitive mixture which essentially contains an ester or an amide of a 1,2-naphthoquinonediazide sulfonic or carboxylic acid as the photosensitive compound, a phenolic resin which is soluble in aqueous-alkaline solutions and insoluble in water as the binder, and an additional speed enhancer, which corresponds to the general formula ##STR1## where X denotes a single bond, CH.sub.2, SO.sub.2, S, CO, C(CH.sub.3).sub.2, CHCC1.sub.3 or ##STR2## Biphenyldiol-(4,4'), bis-(4-hydroxyphenyl)-ketone, 2,2-bis-(4-hydroxy-phenyl)-propane or bis-(4-hydroxyphenyl)-sulfone are described as suitable compounds. The mixture is employed as photosensitive layers in recording materials suitable for the production of printing forms. The invention provides for an increased photospeed, without any disadvantages occurring in respect of the copying or printing behavior.

Photosensitive mixture containing an ester or amide of

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Wiesbaden, Germany

Otfried Gaschler