Abstract: A photographic recording material comprising a support, at least one photosensitive silver halide emulsion layer, a protective layer on that side of the at least one silver halide emulsion layer remote from the support and, optionally a backing layer, the protective layer and/or the backing layer containing in combination (a) a polymeric compound (I) containing at least 0.2 mol-% recurring units corresponding to the following formula ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 may be the same of different and represent hydrogen, alkyl or halogen,L is a chemical bond or a standard binding link andX is a reactive group,and (b) a finely divided crystalline SiO.sub.2 dispersion having an average particle diameter (number average) of from 0.7 to 1.2 .mu.m and containing less than 0.2% by volume particles larger than 4 .mu.m in size, are distinguished by good retouchability in combination with good mechanical properties.

Abstract: Process for the preparation of stable dispersions of hydrophobic reagents in aqueous material, which process involves dissolving an ionomeric polymer, together with hydrophobic reagent substance, in a suitable organic solvent, adding water to the resulting material and then removing the organic solvent. The resulting dispersion has exceptionally high stability and finds utility in the production of diagnostic reagent test devices.

Abstract: A photographic recording material which comprises at least one gelatin-containing silver halide emulsion layer and at least one protective layer containing a gelatin derivative, the protective layer being further away from the layer support than each silver halide emulsion layer and 30 to 90% of the amino groups of the gelatin in the gelatin derivative being reacted with a monofunctional acid derivative, and which is hardened with an instant hardener can be produced at high speed and, hence, at high drying temperatures without any reticulation grain occurring during processing.

Abstract: Photographic silver halide recording material comprising a support, at least one light-sensitive silver halide emulsion layer, a protective layer and optionally other layers, at least one layer which is arranged closer to the support than the protective layer containing a compound which in the form of the free acid corresponds to the following formula ##STR1## wherein R.sub.1 denotes alkylene, arylene, aralkylene or cycloalkylene,L denotes the residue of a polyester diol having an average molecular weight of from 500 to 20,000,m denotes 0 to 1,n denotes 0 to 30, preferably 0 to 10 and m+n.gtoreq.1,is distinguished by improved properties, in particular an improved maximum density.

Abstract: Photographic recording materials of which the binder layers consist of protein-like binders which have been hardened in the usual way show reduced susceptibility to the effect of formaldehyde when--in addition to the usual hardeners--low molecular weight monofunctional compounds which are capable of reacting with free primary amino groups of the binder under casting and/or storage conditions without causing additional hardening are allowed to act on the binder.

Abstract: In order to be able to cast additional layers on auxiliary layers of photographic materials immediately after the latter have been cast without encountering any difficulties as regards uniformity of the cast layer and wet adherence due to incomplete conversion of the gelatine from the sol to the gel form, the auxiliary layer must contain an effective quantity of at least one compound obtained by the reaction of trihydric to hexahydric alcohols with propylene oxide.

Abstract: Water soluble sulphates of a heteroaromatic bis- or poly-sulphone are suitable for use as hardeners for proteinaceous binders, in particular in photographic layers.

Abstract: Propane or butane sultones are prepared by the thermal decomposition of the corresponding aryl sulfoalkyl ethers wherein the alkyl part has three or four carbons between the sulfo group and the ether oxygen. When a tertiary amine is present, the final product is the corresponding sulfoalkyl quaternary salt of the tertiary amine.

Abstract: Water-soluble substantially non-hardening aldehydes or water-soluble substantially non-hardening aldehyde precursor compounds are suitable as fog-reducing compounds for the photographic dye diffusion transfer process in which an imagewise-exposed color photographic recording material containing light-sensitive silver salt and a non-diffusing dye-releasing compound in at least one binder layer arranged on a layer support, is developed, preferably under the effect of heat, to produce a diffusible dye image and in which the diffusible dye image is transferred to an image receptor layer.

Abstract: Water-soluble adducts of tertiary amines with heteroaromatic bis- or polyvinyl sulfone compounds are suitable for hardening layers containing proteins as binder.

Abstract: A color photographic recording material contains at least one silver halide emulsion layer which is divided into a partial layers of different sensitivity, at least one relatively high-sensitivity partial layer containing a synthetic polymer and gelatin in a ratio by weight of from 30:70 to 80:20.

Abstract: Polymer latices in which the dispersed particles consist of a soft core and a hard shell are suitable plasticizers for gelatine in photographic recording materials.

Abstract: Photographic recording materials with improved processing stability are obtained by incorporating at least one phosphonic acid and at least one polyacrylic derivative.

Abstract: The photographic silver halide recording material contains particles of a hydroxyalkyl-alkyl cellulose dicarboxylic acid semiester having a particle size of from 0.5 to 8 .mu.m and a particle size distribution of up to .+-.2 .mu.m dispersed in a hydrophilic colloid in at least one of its outermost layers.

Abstract: Colored dye diffusion images are produced using a recording material containing, on a layer support (layer element 1), a first dye absorbent layer (layer element 2), a light-sensitive element containing silver halide emulsion layers and color-providing compounds (layer element 3) and optionally a second dye absorbent layer (layer element 4), in that order. An imagewise distribution of diffusible dyes is produced in the light-sensitive element in the course of development and transferred to the first dye absorbent layer.The light-sensitive element is then decomposed by a treatment which decomposes its layers, e.g. by means of a proteolytic enzyme, but leaves the first dye absorbent layer intact. The second dye absorbent layer optionally present, which has a lower mordanting capacity than the first dye absorbent layer and serves to prevent contamination of the developer bath with diffusible dyes, is also decomposed.

Abstract: The recording material contains in an outer layer pre-formed polymer particles, the particle size of which is less than 10 .mu.m and which have a particle size distribution of .+-.1 .mu.m, which are soluble in alkaline medium and are dispersed in a hydrophilic colloid, and which are a graft copolymer of methacrylic acid and methyl-methacrylate on the graft base of an .alpha.-olefin- or styrene-maleic acid semiamide-copolymer.

Abstract: Dispersions of hydrophobic substances in water are prepared by dissolving the hydrophobic substance together with an ionomeric polyaddition or condensation product in an organic, water-miscible solvent or a mixture of such a solvent with water, diluting the solution with water and removing the organic solvent. The dispersions are excellently suitable for the preparation of photographic recording materials.

Abstract: Addition polymers containing at least 10 mole % of recurring structural units of formula I are useful mordants for acid dyes which preferably contain at least two sulfo groups. The polymers can be used together with the dyes in dyed layers of photographic recording materials, such as in antihalo or filter layers. ##STR1## in which Q represents N or P;R.sup.1, R.sup.2, R.sup.3 represent alkyl or carbocyclic radicals or two of R.sup.1, R.sup.2 and R.sup.3 complete a 5- or 6-membered heterocyclic ring,R.sup.4 represents H or alkyl,X.sup..crclbar. represents an anion.

Abstract: As mordant for mordanting diffusing anionic dyes in image receiving layers of photographic dye diffusion materials the invention makes use of addition polymers having at least 10 mole % of recurring structural units of formula I ##STR1## in which Q represents nitrogen or phosphorus;R.sup.1, R.sup.2, R.sup.3 each represents a carbocyclic or alkyl group or two of these substituents complete a 5- or 6-membered heterocyclic ringR.sup.4 represents hydrogen or alkyl,X.crclbar. is an anion.

Abstract: At least one gelatin-containing layer of a photographic silver halide material is hardened with a reaction product of two compounds corresponding to the formulaeR(SO.sub.2 --CH.dbd.CH.sub.2).sub.n (A)in which R is an n-functional aliphatic, aromatic, cycloalkyl or heterocyclic group and n is an integer of from 3 to 6 and ##STR1## in which R.sub.1 and R.sub.2 may be the same or different and represent hydrogen or a lower alkyl group, R.sub.3 is an alkyl group, an aminoalkyl group a substituated or unsubstituated aromatic group, a substituated or unsubstituated 5- or 6-membered heterocyclic ring which may be attached to the N-atom of (B) either directly or through a carbon-containing group, or R.sub.2 and R.sub.3 together represent the atoms required to complete a heterocyclic ring system.