Abstract: The present invention relates to a pigment preparation that comprises, as component (A), 2,4,5,7-tetraminopyrimido[5,4g]pteridine of formula (1), as component (B), a phosphate compound, and optionally, as component (C), further additives, to a process for the production thereof and to the use thereof for colouring high molecular weight organic material and in the production of printing colorants, printing pastes or printing inks.

Abstract: The present invention relates to a pigment preparation that comprises, as component (A), 2,4,5,7-tetraminopyrimido[5,4g]pteridine of formula (1), as component (B), a phosphate compound, and optionally, as component (C), further additives, to a process for the production thereof and to the use thereof for colouring high molecular weight organic material and in the production of printing colorants, printing pastes or printing inks.

Abstract: The present invention relates to an aqueous ink composition for the ink-jet printing method, which comprises a) metallic or non-metallic, inorganic platelet-shaped particles having an average particle diameter of at least 2 um, b) a dispersant (dispersing agent) and c) a binder. The ink compositions according to the invention are able to yield prints having a metallic appearance or prints having a colour that changes according to the viewing angle (“flop effect”).

Abstract: Preparation of pigment dispersions by a1) subjecting a mixture A comprising a latent pigment and a polymer to thermal, chemical or photolytic treatment and b) then adding a solvent, or a2) subjecting a mixture B comprising a latent pigment, a polymer and a solvent to thermal, chemical or photolytic treatment, new pigment dispersions and new latent pigments, their use in the process according to the invention for preparing the fine pigment dispersions and the use of the dispersions according to the invention for pigmenting high molecular mass material, including color filters.

Abstract: Preparation of pigment dispersions bya1) subjecting a mixture A comprising a latent pigment and a polymer to thermal, chemical or photolytic treatment andb) then adding a solvent, ora2) subjecting a mixture B comprising a latent pigment, a polymer and a solvent to thermal, chemical or photolytic treatment,new pigment dispersions and new latent pigments, their use in the process according to the invention for preparing the fine pigment dispersions and the use of the dispersions according to the invention for pigmenting high molecular mass material, including color filters.

Abstract: This invention relates to magnetic particles comprising mixed oxides of divalent metals and iron (III), having a diameter of 1-10 nm and a surface area of 120-350 m.sup.2 /g, with silanes bound to the surface of said particle. It also relates to (1) the process for making said particles by simultaneous precipitation and silanization from aqueous solution and (2) their use as carrier materials for the magnetic separation of substances immobilized therewith.

Abstract: A building component in the form of a board-like distance plate having a lattice of horizontal and vertical ribs. Frusto-pyramid projections (3) extend from the intersections of the ribs on one side of the board and domes (4) extend from the other side of the board between the ribs and cover a larger surface area than the projections (3). The domes form cavities which are interconnected by virtue of the projections spacing the plate from a wall or other surface.

Abstract: A photoelectrophoretic imaging process, wherein a suspension of photosensitive pigment particles between two electrodes, at least one of which is transparent, is subjected to the influence of an electric field and exposed to an image, which process comprises using, as photosensitive pigment, a perylenetetracarboxylic acid diimide of the formula ##STR1## wherein R.sub.1 and R.sub.2 are aliphatic, cycloaliphatic, aromatic or heterocyclic radicals.The pigments used in this invention are distinguished by particularly good photoelectrophoretic sensitivity and low fog density.

Abstract: A photoelectrophoretic imaging process, wherein a suspension of photosensitive pigment particles between two electrodes, at least one of which is transparent, is subjected to the influence of an electric field and exposed to an image, which process comprises using, as photosensitive pigment, an isoindoline of the formula ##STR1## wherein R.sub.1 and R.sub.3 are cyano, --COOR or --CONHR', in which R is alkyl, cycloalkyl, aryl or a heterocyclic aromatic radical, and R' is hydrogen, alkyl, cycloalkyl, aryl or a heterocyclic aromatic radical, R.sub.2 and R.sub.4 are cyano, or wherein R.sub.3 and R.sub.4, together with the carbon atom linking them, form a heterocyclic 6-membered ring.The pigments used in this invention are distinguished by particularly good photoelectrophoretic sensitivity and low fog density.

Abstract: Apparatus for drying sheets of photographic material has a group of parallel lower horizontal shafts and a group of parallel upper horizontal shafts which are staggered with reference to the lower shafts. All of the shafts extend transversely of the direction of travel of sheets therebetween and carry elastic rollers which engage and advance the sheets. Certain shafts carry holders for U-shaped guide members which flank the path of the sheets between the rollers on the upper and lower shafts and prevent the leaders of the sheets from curling into the spaces between the upper or lower shafts. The distance between the axes of two neighboring lower or upper shafts is at least 2D and the distance between the upper and lower guide members is less than D, wherein D is the outer diameter of a roller.

Abstract: A device for processing a photographic film through a moistening chamber and a drying chamber has a transition zone where a pair of counterpositioned squeegee rollers is located, of which the upper roller contacts an emulsion carrying surface of the film and the lower roller engages the back surface of the film. The film is advanced to the transition zone from the moistening chamber by a pair of transporting rollers rotated with a predetermined speed. The lower squeegee roller is rotated with a speed exceeding the speed of rotation of the transporting rollers so that a predetermined tension is applied only to the back side of the film to avoid a potential damage to the emulsion carrying surface of the film.

Abstract: The film developing machine includes a tank containing developing fluid, to which a dosing device continually adds regenerating fluid received from a regenerating-fluid supply tank. To prevent the gradual emptying of the supply tank from producing an accuracy-reducing gradual decrease in the pressure applied to the input side of the dosing device, the latter is connected to the supply tank via a buffer vessel provided with an internal valve mechanism serving automatically to keep the volume of regenerating fluid in the buffer vessel substantially constant despite variations in the amount of regenerating fluid contained in the supply tank.

Abstract: Fluid is withdrawn from plural fluid-filled tanks via respective outflow conduits leading into a common mixing conduit which includes a mixing pump, and then branches off through respective inflow conduits for return of intermixed fluid back to the individual tanks. Each inflow conduit is provided with a valve unit comprising a vessel-like housing having an inlet port and an outlet port. The flow from the inlet port to the outlet port is regulated in dependence upon the height of fluid in the respective tank. The fluid height is sensed indirectly by sensing the height or pressure of fluid in the interior of the vessel-like housing, the latter being at least partly lower than the height of fluid in the respective tank. Thus, the return of fluid into each tank is regulated to maintain a respective fluid height therein independently of the other tanks.

Abstract: Apparatus for simultaneous viewing of front and rear surfaces of webs of exposed and developed photographic paper has a frame which supports a rearwardly and upwardly inclined transparent pane constituting the front panel of a box. The frame has a rear wall which is normal to the pane and carries two spindles extending in parallelism with the plane of the pane and serving to support supply and takeup reels for a web of photographic paper whereby the rear side of the web portion between the reels lies against the front side of the pane and the front side of such web portion is observable from the front side of the frame.