Abstract: Disclosed is an aqueous ink composition including between 1 and 40 weight % of a water dispersible resin, between 0.5 and 15 weight % of a colorant, between 20 and 80 weight % of water and between 1 and 30 weight % of an acetal cosolvent, wherein all amounts are relative to the total ink composition. The ink composition may further include between 15 and 75 weight % of a dispersion stabilizing cosolvent.

Abstract: An ink composition includes a dispersion of resin particles in water, a colorant and a co-solvent fraction for stabilizing the dispersion, wherein the co-solvent fraction includes at least one branched polyhydric alcohol and/or at least one (poly)ether modified branched polyhydric alcohol, and between 0.1 and 5 weight % polyvinylpyrrolidone having a weight average molecular weight of at least 5000 g/mol. Such ink compositions show improved robustness on a range of print substrates. In this way robust look and feel films can be realized also on less absorbing media, like the offset coated gloss, silk and matt ones with a better freedom towards recipe variation of e.g. latex and the concentrations of the ingredients.

Abstract: Disclosed is an aqueous ink composition including between 1 and 40 weight % of a water dispersible resin, between 0.5 and 15 weight % of a colorant, between 20 and 80 weight % of water and between 1 and 30 weight % of an acetal cosolvent, wherein all amounts are relative to the total ink composition. The ink composition may further include between 15 and 75 weight % of a dispersion stabilizing cosolvent.

Abstract: The present invention relates to an ink composition suitable for being ejected from an inkjet marking device at an operating temperature. The ink composition comprises a water-dispersible resin and has a dynamic surface tension of below 35 mN/m and a static surface tension of above 21 mN/m both determined at the operating temperature. The ink composition may comprise a mixture of water-soluble organic solvents having a difference in the relative dielectric constant of more than 5, preferably between 10 and 50. The ink composition may comprise a polymeric cosolvent, in particular a polyethylene glycol or polyethylene glycol (di)methyl ether. The ink composition may comprise a mixture of surfactants comprising at least one surfactant of a first type selected from the group consisting of acetylene glycols and ethoxylated acetylene glycols and at least one surfactant of a second type selected from the group consisting of silicone surfactants and fluorochemical surfactants.

Abstract: The invention relates to a toner for developing a toner image, the toner comprising a binder resin, an inorganic component and a wax. The wax is finely dispersed within the toner and has a melting transition, wherein the lower temperature limit of the melting transition is between 110° C. and 140° C. at the time of temperature rise in the DSC curve measured using a differential scanning calorimeter. The invention further relates to a printing system for applying the toner according to the present invention on an image receiving medium. The invention further relates to a method for preparing the toner according to the present invention.

Abstract: A method of producing a screened layer on an electrophotographic element by applying a homogeneous layer to a support and removing small areas from the layer by blasting it with particles having a diameter of between 5 and 1000 .mu.m.

Abstract: Charge-transporting compounds which form substantially colorless layers having a minimal residual charge and a good cleanability are disclosed. These compounds are of the general formula: ##STR1## wherein R1, R2, and R3, individually, represent a hydrogen atom or an alkyl group containing 1 to 4 carbon atoms. Also disclosed is a photoconductive element containing a charge-generating compound and a charge-transporting compound of the general formula shown above which is homogeneously distributed in a binder. The charge-transporting compounds of the general formula are very soluble in various solvents and film-forming polymers providing for great maneuverability in processing the compounds into layers.

Abstract: A copying process in which a pattern of charged and uncharged areas is superimposed on a charge image by charging and exposing image-wise an electrophotographic element which is provided with a charge-transporting top layer having therebeneath a charge-generating layer which can inject charges into the charge-transporting top layer at areas corresponding to said pattern of uncharged areas, but cannot inject charges into the other areas of the charge-transporting top layer. The charge image is developed with a developing powder having a resistivity of less than 10.sup.12 ohms.multidot.cm and the resulting powder image is transferred to a receiving material and fixed thereon. The pattern of charged and uncharged areas is provided to produce a uniform light-grey image where desired.

Abstract: A multi-layered electrophotographic element providing significantly improved properties, and especially so for use as a "permanent" master in transfer photocopying, comprises a conductive support carrying a photoconductive charge generating layer and on top of the photoconductive layer a charge transporting layer containing homogeneously distributed in an insulating binder a charge transporting agent selected from among certain azines which may comprise one or more alkylsubstituents and/or heterocyclic groups with at least one nitrogen atom and/or phenyl or naphthyl groups. The charge transporting layer may also contain to advantage an activator for the charge transporting agent. Particularly effective activators are terephthalal dimalonitrile (TDM) and 1,3,7- trinitro-dibenzothiophene-5,5-dioxide (DBTO). The charge transporting layer preferably is applied to a very thin charge generating layer formed on an endless support, and which contains the charge generating compound in molecularly divided form.