Abstract: A toner in which at least a major portion of the resin component is a soft polymer encapsulated and dispersed in a tough polymer matrix in a plurality of discrete domains, instead of as a single core. A convenient method of providing such dispersion is by the use of a block, graft or shaded copolymer, as a dispersing agent, comprised of components which are identical to the soft and tough polymers. The toner is pressure fixable.

Abstract: A novel printing master and method for producing the same as disclosed, which comprises coating a suitable substrate with an uncured silicone gum, followed by the adherence thereto of a particulate image pattern. Resultant curing of the gum converts the gum to a tough elastomeric ink releasable film, thereby fixing the integral particles to the film while in intimate contact therewith. After curing, substantially all of the deposited particles are removed from the elastomer film, thereby revealing a "porous" image in the ink releasable film, of surprising ink receptive characteristics. The porous image thus is formed by contact of the integral particles of varying geometric shapes and sizes with the uncured silicone gum, thereby creating "impressions" of the particles in the gum which are then permanently stabilized in the gum by curing of the gum to an elastomeric film.

Abstract: A novel printing master and method for producing the same is disclosed which comprises the coating of a suitable substrate with an uncured silicone gum composition containing an activating proportion of a "blowing" or "foaming" agent. A particulate image pattern such as a toner image pattern, is transferred to the uncured silicone layer, followed by curing of the gum to an elastomeric ink releasable film. Activation of the "blowing" agent occurs during curing of the silicone to cause imagewise "foaming" of the silicone layer. After removal of the deposited image pattern, a "foamed" image is formed which is ink receptive and provides an imaged printing master suitable for use without a need for aqueous dampening solutions to provide ink release in non-imaged areas of the master.

Abstract: Photoconductive waterless lithographic printing masters are provided having particle-to-particle contact of photoconductive material by placing a heterogeneous copolymer having an abhesive species and an imaging material adhesive species, in a solvent in which at least one of said species can be preferentially dissolved, preferentially dissolving one of said species and forming a suspension of photoconductive material in said soluble species, and coating the suspension on a suitable master substrate, allowing the solvent to evaporate, imaging the material with an ink accepting particulate imaging material in image configuration, and fusing the particulate imaging material to the coated master substrate while preferably effecting a phase inversion between the two species of the heterogeneous copolymer.

Abstract: A novel printing master and method for producing the same is disclosed which comprises; coating a suitable substrate with a layer of an ink releasable material selected from the group consisting of silicone elastomers and heterophase polymeric compositions having a silicone phase. A particulate image pattern is thereafter deposited on the layer and fused thereon to provide ink receptive image areas on said layer. The material used to provide the particulate image pattern comprises a heterophase polymeric composition also having a silicone phase, thereby providing a physically compatible image pattern for adherence to the silicone containing ink release layer.

Abstract: A toner in which at least a major portion of the resin component is a soft polymer encapsulated and dispersed in a tough polymer matrix in a plurality of discrete domains, instead of as a single core. A convenient method of providing such dispersion is by the use of a block, graft or shaded copolymer, as a dispersing agent, comprised of components which are identical to the soft and tough polymers. The toner is pressure fixable.

Abstract: A process for preparing a waterless lithographic printing master is provided. A suitable substrate which is preferably ink accepting is coated with a silicone which is curable at low or ambient temperature and which contains in addition to its own catalyst a high temperature catalyst. The silicone is then cured at least on its surface to render it nontacky. A particulate image pattern is deposited on the cured silicone which pattern comprises a material which at elevated temperature combines with the high temperature catalyst to degrade the cured silicone below said image pattern, the composite heated to degrade the silicon below the image pattern and render the nonimaged areas ink releasing to the extent the silicone was not previously rendered ink releasing, and the particulate image pattern and preferably the degraded silicone removed beneath said pattern to reveal the ink accepting substrate in image configuration.