Agfa-gevaert Ag

Agfa Gevaert Nv

Agfa-gevaert

Raf Voets

Serge M Tavernier

Guido Vital Desie

Michael Mager

August M Marien

Rafael P Samijn

Marc P Stevens

Rainer Bellinghausen

Johannes Eickmans

Finely divided particles can be provided in a simple manner and with good adhesion with a coating which is a polyfunctional organosilane and/or a hydrolysis product thereof, and/or a reaction product thereof with an organosilane which contains a hetero atom and/or with an alkoxide.

Coated particles containing a monomeric, polyfunctional organosilane coating

A method for direct electrostatic printing includes the steps of providing a magnetic brush carrying carrier particles and toner particles, the carrier particles having a specific volume resistivity of between 10.sup.1 .OMEGA..multidot.cm and 10.sup.9 .OMEGA..multidot.cm and a specific density lower than 5 g/cm.sup.3, creating in an electrical field a flow of charged toner particles directly from the magnetic brush to a substrate, image wise modulating the flow of charged toner particles by a printhead structure having printing apertures and control electrodes, image wise depositing toner particles from the image wise modulated flow of charged toner particles on the substrate, and fixing the toner particles to the substrate.

Method for direct electrostatic printing in which toner particles are

Processes are disclosed for incorporating a water-insoluble substance in a diffusion resistant form into a hydrophilic colloidal layer of an element. In a first process A the water-insoluble substance is present during the polycondensation of diol(s) or polyol(s) and carboxylic acids, whereby at least 6 mole % of the reagents bear a water-solubilizing group, preferably a sulpho group in the salt form; the obtained mixture of polyester and water-insoluble substance is then dispersed in an aqueous medium. In an alternative process B the polyester is first prepared and then mixed homogeneously with the hydrophobe substance by melting in a reactor or extruder; the mixture is then similarly dispersed. The obtained latex is then incorporated in a hydrophilic colloidal layer which is coated on a support. The obtained element can serve as base for a reprographic image, e.g. a color proof image, or can form part of a complete photographic material. In a preferred embodiment the water-insoluble substance is a brightening agent.

Process for incorporation of a water-insoluble substance into a

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Hever, Belgium

Raf Voets