Agfa-gevaert Ag

Bayer Aktiengesellschaft

Walter Simm

Friedrich Bestenreiner

Bela Von Falkai

Claus Gosling

Richard Bonart

Wolfgang Podszun

Carlhans Suling

Hans-Rudolf Dicke

John W Goossens

Roland Vogelsgesang

Hermann Brinkmeyer

Gunter B Weber

Friedrich-Wilhelm Kremer

The spray mist is produced by ejecting the liquid from one or more nozzles (1) in the form of jets (2) disintegrating into drops and the liquid formed from the drops is then conveyed to a spray system (4) which is electrically insulated from the nozzles (1) and a powerful electric field is applied between the nozzles (1) and the spray system (4). A spherical impact electrode or a two-material spray nozzle insulated against earth under a high voltage may be used as spray system. The main advantage is that the smooth jet nozzle (1) and hence also the container for the liquid to be sprayed are at earth potential.

Process for the production of electrically charged spray mist of

The processing by shaping, in particular includes here the moulding, spinning, extrusion, compression and injection moulding of polymers. An electric field thereby influences the flowing polymer melt before and/or during and/or after shaping. The temperature of the melt is maintained at a value between the glass temperature and the isotropic point. Thermotropic liquid-crystalline polymers are used as starting product. Among these are, in principle, all polymers which have mesogenic groups in the main and/or side chain and which can be processed from the liquid-crystalline melt phase. The orientation distribution and thus also the mechanical properties of the end product can be purposefully regulated by the electric field.

Thermoplastic processing of thermotropic liquid-crystalline polymers

The suspension developer contains as a toner polymer-sheathed pigment particles in an electrically insulating carrier liquid. The sheath of the pigment particles is formed by precipitation polymerization from various (meth)acrylates, a cross-linker and, optionally, a vinyl or vinylidene monomer. The developer has an outstanding dispersion stability which does not change during use or storage.

Electrostatographic suspension developer and process for the production

The invention relates to a process for electrophotographic color image development by which charge images are rendered visible by electrophoretic deposition of color zones on a continuously moving image carrier-band in development stations, using contact electrodes, development electrodes and blocking nozzles for the developer liquid whereby the development of the image in the development station is carried out with a substantial deviation .alpha. of the direction of movement of the image carrier from the horizontal.

Process for electrophotographic color image development on a

For improving the electrical contact between an insulating image carrier and a conductive support during development of an electrostatic charge image in electrographic recording processes a gas permeable support is used through which gas ions are brought to the back of the carrier while development takes place on the image side.

Method of improving the electrical contact between the insulating image

In a process for the transfer printing of charge images the carrier of a primary charge image is covered with an insulating film the backside of which is electrically charged by means of a corona discharge under concentrated gaseous nitrogen, and the film now carrying the secondary charge image is subsequently removed from the carrier of the primary charge image.

Process for the transfer printing of electrostatic charge images using

The recording of half-tone images by electrophotographic and electrographic recording processes can easily be controlled by a method of altering the gradation in electrostatographic recording of latent charge images of half-tone originals wherein a first latent charge image produced on a primary recording material is recorded as a second latent charge image of altered gradation on a secondary recording carrier by means of a charging current which is controlled by a slotted diaphragm.

Method of altering the gradation in electrostatic recording of half-tone

In a process for the production of fibre filters, the fibre material is sprayed electrostatically from the liquid state and deposited as a fibre fleece on a conductive support. The starting materials used are solutions of high polymers in readily volatile solvents. The filters obtained have substantially improved properties.

Fibre fleece of electrostatically spun fibres and methods of making same

In a process for the production of fibre filters, the fibre material is sprayed electrostatically from the liquid state and deposited as a fibre fleece on a conductive support. The starting materials used are solutions of high polymers in readily volatile solvents. The charged filters obtained have substantially improved properties.

Filter made of electrostatically spun fibres

In a process for the production of fiber filters, spinning solutions are electrostatically sprayed and deposited continuously onto a gas-permeable band-form support. The band-form support travels successively through several spray zones and is always guided from one spray zone into the next below the spray electrodes. Row arrangements of rotating rings dipping into the spinning liquid are used as the spray electrodes, the rings of one row lying in one plane.

Apparatus for the production of filters by electrostatic fiber spinning

In a process for the electrographic recording of images on an insulating recording substrate by means of a corona discharge the imagewise charging is carried out by means of a recording electrode which is in contact with the recording substrate the electrical contact between the recording electrode and insulating recording substrate being established by means of a conductive contact liquid.

Process and apparatus for electrographic recording utilizing contact

Process for the electrophotographic recording of charge images on insulating recording material, wherein a gas discharge and the imagewise control of the discharge current which is used for charging the recording material take place in the presence of one or more gases which have an electron affinity of less than 1 eV.

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Leverkusen, Germany

Walter Simm