Abstract: Carboxylates of hydroxyl-containing polymers are prepared by reacting a finely dispersed hydroxyl-containing polymer with a carboxylic anhydride in the heterogeneous phase in the presence of a tertiary amine as a catalyst by a method in which an N-alkylimidazole, where alkyl is of 1 to 10 carbon atoms, is used as the catalyst.

Abstract: Mixtures which are curable by heating or irradiation with actinic light contain one or more cationically curable compounds, such as an epoxy, an olefinically unsaturated monomer, amino resin or phenolic resin, and as a cationically active curing catalyst one or more N-sulfonylamino-sulfonium salts of the formula ##STR1## such as N-p-toluenesulfonyl-N-methylaminodiphenylsulfonium hexafluorophosphate with or without quinones or peroxides are suitable, inter alia, for producing moldings, coatings, relief images and resist patterns.

Abstract: In dry film resists possessing a solid photopolymerizable resist layer, which is applied on a temporary base and can be developed with aqueous, in particular aqueous alkaline, media, and, if required, a cover sheet on the resist layer, the said resist layer is built from a homogeneous mixture of (a) not less than 40% by weight of one or more oligomers which contain free carboxyl groups and more than two acryloyl and/or methacryloyl groups and are soluble or dispersible in aqueous alkaline solutions, (b) from 1 to 35% by weight of one or more film-forming compatible polymers which are soluble in aqueous media, (c) from 1 to 30% by weight of one or more compatible photopolymerizable monomers, (d) from 0.001 to 10% by weight of one or more photoinitiators and (e) from 0 to 30% by weight of further additives and/or assistants. Resist images are produced on a substrate by a process employing photopolymerizable resist layers of the type stated above.

Abstract: Oligomeric resins are crosslinkable by polymerization, soluble or dispersible in aqueous alkaline solutions, preferably contain more than 2 (meth)acryloyl groups and free carboxyl groups and are prepared by a special process. Photosensitive, photopolymerizable and crosslinkable recording materials for optical information fixing are based on these oligomeric resins, and lithographic printing plates are produced by a process in which the novel photosensitive recording materials are used.

Abstract: Layer-type magnetic recording media are produced by dispersing a finely divided magnetically anisotropic material in a binder which consists of not less than 30% of a radiation-curable aqueous binder dispersion, applying the dispersion onto a non-magnetic base, orienting the magnetically anisotropic material and drying and crosslinking the applied layer by means of UV or high-energy electron radiation.

Abstract: Photocured layers possessing a defined controllable hardness are produced by exposing a layer of a photopolymerizable or photocrosslinkable mixture, which contains a partially crystalline polymeric binder possessing olefinic double bonds capable of undergoing polymerization, to actinic light, by a method in which the photocurable layer, prior to exposure to actinic light, is subjected to a heat treatment in which the partially crystalline parts of the polymeric binder are partially or completely fused.

Abstract: A photopolymerizable recording material for the production of relief plates comprises a photopolymerizable layer which can be developed in an alcoholic solution and contains a mixture of a photoinitiator, a photopolymerizable monomer and a linear, high molecular weight polyurethane which possesses activated double bonds in side branches, and is prepared using a polyether-diol from the group comprising the polyethylene glycols, propylene glycols and ethylene glycol/propylene glycol co-condensates.

Abstract: Acylphosphine sulfides of the formula ##STR1## where R.sup.1 is alkyl, cycloalkyl or an unsubstituted or substituted phenyl, naphthyl or heterocyclic radical; R.sup.2 has the meaning of R.sup.1 and can be identical to or different from R.sup.1, or is alkoxy, unsubstituted or substituted phenoxy or phenoxyalkyl, or R.sup.1 or R.sup.2 are linked together to form a ring, which may contain further alkyl substituents and fused-on benzene rings; R.sup.3 is alkyl, a cycloaliphatic radical, substituted phenyl, an unsubstituted or substituted naphthyl or heterocyclic radical or the group ##STR2## where X is unsubstituted or substituted phenylene or an aliphatic or cycloaliphatic divalent radical; and where one or more of R.sup.1, R.sup.2 and R.sup.3 may be olefinically unsaturated.These acylphosphine sulfides can be prepared from acylphosphines and sulfur and can be used as photoinitiators in photopolymerizable compositions.

Abstract: Acylphosphine oxides of the general formula ##STR1## where R.sup.1 is methyl or ethyl, R.sup.2 is a branched or straight-chain alkyl radical or chlorine, alkoxy or hydrogen, R.sup.3 and R.sup.4 are identical or different, and are each alkyl, alkoxy, alkylthio or chlorine and R.sup.5 is hydrogen, chlorine, alkoxy, alkylthio or alkyl, may be used as photoinitiators in photopolymerizable materials.