Hoechst Aktiengesellschaft

Morton International, Inc.

Hans-Dieter Frommeld

Hartmut Steppan

Hartmut Wiezer

Hans Ruckert

Ulrich Geissler

Juergen Lingnau

Siegfried Scheler

Klaus Thoese

Walter Lutz

Hansjoerg W Vollmann

Heike Ziemke

A photopolymerizable composition, which contains a polymeric binder, a compound which can be polymerized by free radicals and has at least one terminal ethylenic double bond and a photoinitiator combination comprising an N-heterocyclic compound, a thioxanthone derivative and a dialkylamino compound, is highly photosensitive and produces photoresist stencils with vertical side walls.

Photopolymerizable composition and photopolymerizable recording material

Photopolymerizable composition containing an N-heterocyclic

A photopolymerizable mixture is disclosed that contains a polymer binder, a polymerizable compound having at least one terminal ethylene double bond and a boiling point above 100.degree. C. at normal pressure, a hexaarylbisimidazole and a 1,3-diarylpyrazoline or a 1-aryl-3-aralkenyl-pyrazoline. The mixture is suitable for the preparation of printing plates and photoresists and is distinguished by high photosensitivity and low sensitivity towards acid solutions.

Photopolymerizable mixture and recording material prepared therefrom

A photopolymerizable mixture is described which contains a polymeric binder, a polymerizable compound and an acridine compound of the general formula I ##STR1## as photoinitiator, in which R.sup.1 denotes an optionally substituted alkyl or acyl group,

Photopolymerizable mixture and photopolymerizable copying material

Compounds of the general formula I ##STR1## are described in which R.sup.1 is a group of the formula ##STR2## and R.sup.2 is a hydrogen atom or a methyl group, or

Quinoline and acridine compounds effective as photoinitiators and

The invention describes a process for stabilizing a leuco-dye solution in an organic solvent against oxidation in air. In the process, a compound containing at least one 2,2,6,6-tetraalkylpiperidine, 2,2-dialkylpiperidine-6-spiro-cycloalkane or piperidine-2,6-dispiro-cycloalkane grouping is added to the solution. The process is, in particular, used for stabilizing photoresist solutions which, apart from the leuco dye, contain polymerizable compounds and photoinitiators, especially radiation-sensitive trihalomethyl compounds.

Process for stabilizing a leuco-dye solution by means of a piperidine

A photopolymerizable composition that contains a polymeric binder, a polymerizable compound and photoinitiator combination comprising an N-heterocyclic compound and a halogen compound corresponding to one of the folowing formulas I and II ##STR1## in which X.sup.1 stands for chlorine or bromine,

The invention comprises a photopolymerizable mixture comprising as the essential constituents a polymeric binder, a compound capable of forming a polymer by free-radical initiated polymerization, a photoinitiator, a leuco dye and a leuco dye stabilizer having at least one epoxy group. The mixture has a better shelf life in the dark than known compositions and is preferably used in the preparation of dry photoresists.

Photopolymerizable compositions a leuco dye and a leuco dye stabilizer

Upon imagewise exposure, a photopolymerizable composition which contains

A photosensitive composition comprising a polymeric diazonium salt, preferably a diazonium salt polycondensation product, and a polymeric binder possessing lateral crosslinking groups represented by the formula --CH.sub.2 --OR, wherein R denotes a hydrogen atom, a lower alkyl group, a lower acyl group or a lower hydroxyalkyl group, can be used to produce printing plates which yield considerably increased print runs after being baked at temperatures of 150.degree. C. to 250.degree. C.

Photosensitive composition and recording material with photosensitive

In photopolymerizable composition that contains, as the essential constituents,

Photosensitive mixture and photosensitive recording material with

A two-component diazotype material, composed of a support and a light-sensitive layer which is applied thereto and contains a polymeric binder, a diazonium salt, a coupler, an acid stabilizer and conventional additives, wherein the support is a biaxially oriented polyester film and the polymeric binder comprises a mixture of about 10-60 percent by weight of a polymer or copolymer of vinyl acetate, for example, a copolymer of vinyl acetate and crotonic acid, and about 40-90 percent by weight of a cellulose ester, such as cellulose acetopropionate, cellulose acetobutyrate, cellulose propionate or cellulose butyrate.

Two-component diazotype material

This invention relates to an improvement in a two-component diazotype material, composed of a support and of a light-sensitive layer applied to the support, the layer containing at least one benzene diazonium salt as the light-sensitive component and at least one coupler, the improvement comprising the combination of at least one 2,5-dialkoxy-4-mercaptobenzene diazonium salt and at least one compound of the general formula ##STR1## in which R.sub.1 and R.sub.2 are identical or different and denote hydrogen or alkyl, alkenyl, aralkyl, aryl or cycloalkyl groups, which can be further substituted.

This invention relates to an improvement in a two-component diazotype material comprising a film support and a light-sensitive layer thereon, the light-sensitive layer being composed of at least one polymeric hydrophobic binder, a light-sensitive diazonium salt and a coupler, the improvement that the light-sensitive layer additionally contains at least one resin containing acid groups, which resin has an acid number of at least about 100 and which is derived from the maleic acid or phthalic acid type.

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Wiesbaden, Germany

Hans-Dieter Frommeld