Abstract: The present invention provides an imaging element comprising a support, a porous layer, a photosensitive layer containing a photopolymerizable composition and optionally a stripping layer characterized in that there is provided a barrier layer between said photosensitive layer and said porous layer said barrier layer being impermeable for the photopolymerizable composition at ambient temperature and capable of increasing its permeability with increasing temperature.

Abstract: Using a dye acceptor element for thermosublimation printing comprising a dye acceptor layer containing a polycarbonate formed from a diphenol of formula I and, optionally, another polymer resin ##STR1## in formula I: R.sup.1 and R.sup.2 independently of one another represent hydrogen, halogen, C.sub.1-8 alkyl, C.sub.5-6 cycloalkyl, C.sub.6-10 and aryl and C.sub.7-12 aralkyl,X represents a carbon atom,m is an integer of 4 to 7,R.sup.3 and R.sup.4 may be individually selected for each X and independently of one another represent hydrogen or C.sub.1-6 alkyl with the proviso that, at at least one atom X, R.sup.3 and R.sup.4 are both alkyl.

Abstract: In a dye acceptor element for the thermal dye sublimation printing process, containing a support and a dye acceptor layer consisting of a continuous phase and at least one disperse phase the dispersed phase is formed by a partially or completely cross-linked 1,3-dienehomo- or -co-polymer which has a solubility parameter of from 8 to 12 (cal/cm.sup.3).sup.1/2. The disperse phase makes up 20 to 90% by weight of the sum of the continuous and disperse phases. The dye acceptor element is distinguished by high resolution, high brilliance and good long term stability.

Abstract: An electrostatographic suspension developer contains a dispersed pigment and a copolymer ofA. cationic monomers which contain ammonium, phosphonium or sulfonium groups and of which the anions are derived from CH-acidic or sulfur- or phosphorus-containing acidic compounds containing at least one C.sub.6 -C.sub.24 hydrocarbon radical andB. radically polymerizable, olefinically unsaturated compounds as comonomersin an electrically insulating carrier liquid having a volume resistivity of at least 10.sup.9 ohm. cm and a dielectric constant below 3.

Abstract: An electrostatographic suspension developer contains, in an electrically insulating carrier liquid with a volume resistivity of at least 10.sup.9 Ohm. cm and a dielectric constant of below 3, a dispersed pigment and a polymer of basic secondary or tertiary amino group-containing monomers, the amino groups of which are completely or partially neutralized with a Bronsted acid, which contains at least one hydrocarbon radical having from 6 to 24 carbon atoms, and optionally further comonomers.

Abstract: The suspension developer contains, in an electrically-insulating carrier liquid, a pigment and a block copolymer comprising a block of polymerized vinylaromatic compounds and a block of polymerized dienes the double bonds of which have been partially or completely reacted with alkyl mercaptans. The developer is distinguished by its high dispersion stability, small particle size and uniform particle size distribution.