Abstract: This invention relates to a light-sensitive copying material comprising a layer support and a positive-working light-sensitive layer thereon having a rough surface and a content of finely divided particles, wherein the smallest dimension of the particles corresponds at least to the thickness of the layer.

Abstract: A light-sensitive mixture is described, which is specially intended for the production of planographic printing plates and which contains, as the light-sensitive compound, a naphthoquinonediazide sulfonic acid ester of the general formula I ##STR1## in which D is the 1,2-naphthoquinone-2-diazide-5-sulfonyl radical or the 1,2-naphthoquinone-2-diazide-4-sulfonyl radical, preferably the 1,2-naphthoquinone-2-diazide-5-sulfonyl radical, R and R' are hydrogen atoms, alkyl groups having 1 to 4 carbon atoms or radicals of the formula DO, and n denotes an integer from 6 to 18, preferably from 8 to 14. The new compounds are distinguished by good solubility and produce layers which have a high resistance to alkaline developer solutions and to damping solution containing alcohol.

Abstract: Disclosed is a light-sensitive mixture comprising (a) a 1,2-quinonediazide or a mixture of (a.sup.1) a compound forming an acid on exposure and (a.sup.2) a compound having at least one C--O--C bond cleavable by acid; (b) a water-insoluble binder soluble in aqueous-alkaline solutions; (c) a photolytically cleavable organic halogen compound of one of the formulae ##STR1## in which R.sup.1 denotes an aromatic radical bonded directly or via a conjugated chain, and X denotes a halogen atom; and (d) an azo dyestuff containing at least one nitro group in the molecule. Also disclosed are light-sensitive copying materials produced from these mixtures.

Abstract: Disclosed is a light-sensitive mixture comprising (a) a 1,2-quinonediazide or a mixture of (a.sup.1) a compound forming an acid on exposure and (a.sup.2) a compound having at least one C--O--C bond cleavable by acid; (b) a water-insoluble binder soluble in aqueous-alkaline solutions; (c) an organic compound forming an acid on exposure of the general formula I ##STR1## in which X is a single bond or one of the groups CO, SO.sub.2, N=N or CR.sup.7 R.sup.8, R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are hydrogen atoms, halogen atoms or nitro groups, with not more than two of these radicals being hydrogen atoms and at least one thereof being a nitro group, R.sup.5 and R.sup.6 are hydrogen atoms or 1,2-naphthoquinone-2-diazide-4-sulfonyloxy radicals, with R.sup.5 and R.sup.6 being always different from each other, and R.sup.7 and R.sup.8 are hydrogen atoms or lower alkyl radicals, and (d) an azo dyestuff containing at least one nitro group in the molecule.

Abstract: A light-sensitive mixture is described, which contains, as the light-sensitive compound, a 1,2-naphthoquinone-2-diazidesulfonic acid ester of the general formula I ##STR1## in which R and R' denote hydrogen atoms or lower alkyl groups, X denotes a saturated alkylene, hydroxyalkylene or dihydroxyalkylene group having 6 to 18 carbon atoms, D denotes the 1,2-naphthoquinone-2-diazide-5-sulfonyl radical or the 1,2-naphthoquinone-2-diazide-4-sulfonyl radical and n denotes a number from 1 to 20. The new quinone diazides produce printing plates which are capable of long printing runs and have good resistance to developer and good flexibility of the printing stencil.

Abstract: A light-sensitive mixture is described which contains a water-insoluble resinous binder, which is soluble or swellable in aqueous-alkaline solutions, and a novel 1,2-naphthoquinone-2-diazide-sulfonic acid ester of a dihydroxyacylophenone or of a dihydroxybenzoic acid ester of the formula I ##STR1## in which R.sup.1 is an alkyl or alkoxy radical, the carbon chain of which can be interrupted by ether oxygen atoms, R.sup.2 is a hydrogen atom, an alkyl radical having 1-3 carbon atoms, or a chlorine or bromine atom and D is a 1,2-naphthoquinone-2-diazide-sulfonyl radical. The copying materials prepared from this mixture are particularly suitable for the preparation of printing plates which give long print runs and have a high light sensitivity. The compounds of the formula I are distinguished by good solubility in customary coating solvents.

Abstract: A light-sensitive composition, especially suitable for preparation of planographic printing plates, comprising a water-insoluble resinous binder which is soluble or swellable in aqueous alkaline solutions, and a naphthoquinonediazide sulfonic acid ester of the general formula I ##STR1## wherein D represents a 1,2-naphthoquinone-2-diazide-4-sulfonyl or 1,2-naphthoquinone-2-diazide-5-sulfonyl radical and R represents an alkyl or aryl radical. Printing plates produced with such compositions exhibit good resistance to aqueous alkaline developers, alcohol-containing moistening liquids and gasoline hydrocarbons.

Abstract: A light-sensitive mixture, which is composed of a light-sensitive compound, for example, an o-quinone-diazide or a diazonium salt polycondensate, or a light-sensitive combination of compounds, for example, a photolytic acid donor and an acetal compound or orthocarboxylic acid compound which can be cleaved by acid, and of a novolak having halogenated phenol units is described. The mixture is preferably used for the preparation of printing plates, in particular planographic printing plates, which have an improved resistance to aqueous-alkaline developer solutions, gasoline hydrocarbons and fountain solutions containing alcohol.

Abstract: A light-sensitive mixture is disclosed which contains a water-insoluble, aqueous-alkali-soluble binder, a light-sensitive o- or p-quinone-diazide or a mixture of (a) a compound which generates or splits off an acid on exposure to light and (b) a compound having at least one C--O--C group which can be cleaved by acid, and a phenol compound having 1 to 3 benzene nuclei which are mutually linked by single bonds, carbonyl groups, ether groups, thioether groups or optionally substituted methylene groups, and having at least one phenolic hydroxyl group and at least two substituents of the formula --CH.sub.2 OR, in which R is hydrogen or a lower alkyl or acyl group. The mixture is used for the preparation of light-sensitive copying material, preferably for the preparation of planographic printing forms. The addition of the phenolic compound has the effect that the developed printing forms can be baked at lower temperatures than hitherto in order to extend the printing run.

Abstract: A positive-working light-sensitive copying material, in particular for the preparation of planographic printing plates, is described, the light-sensitive layer of which contains an ester or amide of a o-naphthoquinone diazide-sulfonic or -carboxylic acid, an alkali-soluble, water-insoluble phenolic resin and a condensation product of a hydroxybenzophenone and formaldehyde. The material is distinguished by an increased light-sensitivity.

Abstract: This invention relates to a photosensitive copying composition comprising a solvent and a naphthoquinone-(1,2)-diazidesulfonic acid ester as the photosensitive compound, said naphthoquinone diazide sulfonic acid ester having the general formula I ##STR1## wherein: X is a single bond or one of the groups ##STR2## R.sup.1, R.sup.1' and R.sup.1" are the same or different and are H or D, R.sup.2 and R.sup.2' are the same or different and are H or halogen,R.sup.3 is halogen or D, andD is a naphthoquinone-(1,2)-diazidesulfonyloxy group.

Abstract: This invention relates to a photosensitive composition comprising an ester or an amide of an o-naphthoquinone diazide sulfonic or carboxylic acid and, based upon the amount of this compound, about 1 to 50 percent by weight of an organic dye capable of salt formation, and about 5 to 75 percent by weight of a photosensitive halogen-containing diazonium salt which releases acid upon exposure to light and having the general formula I ##STR1## IN WHICH R.sub.a is selected from the group consisting of hydrogen, halogen, an alkyl, alkoxy, aryl, arylmercapto, aryloxy, arylamino or benzoylamino group, R.sub.b and/or R.sub.c are selected from the group consisting of hydrogen, an alkyl, alkoxy, aryloxy, alkylmercapto or arylmercapto group, A is selected from the group consisting of PF.sub.6, BF.sub.4, AsF.sub.6, SbCl.sub.6, SnCl.sub.6, BiCl.sub.5, ZnCl.sub.4 or SbF.sub.6, and x is 1 or 2, with R.sub.a and R.sub.c simultaneously not being hydrogen.

Abstract: This invention relates to a photosensitive composition comprising an ester or an amide of an o-naphthoquinone diazide sulfonic or carboxylic acid and, based on the amount of this compound, about 1 to 50 per cent by weight of an organic dye capable of salt formation and about 5 to 75 per cent by weight of a photosensitive halogen-containing compound which releases acid upon exposure to light and having one of the general formulae I or II ##STR1## in which R.sub.a is an aryl group or a heterocyclic group which may be substituted, R.sub.b is a trihaloalkyl group or a trihaloalkenyl group having from 1 to 3 carbon atoms, and n is 1, 2 or 3.

Abstract: This invention relates to an improvement in a light-sensitive copying layer containing an ester or an amide of an o-naphthoquinone diazide sulfonic acid or carboxylic acid together with an organic dyestuff and which changes its color shade upon exposure to light, the improvement comprising that it contains, calculated on its total content of o-naphthoquinone diazide compounds, 10 to 75 per cent by weight of a halide of o-naphthoquinone diazide-4-sulfonic acid and, as the dyestuff, an organic compound capable of salt formation in a quantity of 1 to 50 per cent by weight, calculated on the same basis.