Abstract: Described herein is a method for priming a polymeric print substrate for subsequently receiving a liquid electrophotographic (LEP) ink in which a surface of a polymeric print substrate is coated with a first primer using an analogue printing technique and a second primer is digitally printed to the surface of the polymeric print substrate coated with the first primer.

Abstract: A method for determining coat weight of a transparent primer coating for liquid electrophotographic printing processes is described, in which an optical brightening agent is added to an aqueous transparent primer composition in an amount of less than 0.1 wt. % based on the total solids content of the primer composition to produce a test composition, the test composition is applied onto a test substrate to produce a transparent primer coating, the fluorescence of the transparent primer coating is measured, and the coat weight of the transparent primer coating based on the fluorescence of the transparent primer coating is determined.

Abstract: Herein is disclosed a liquid electro photographic (LEP) printing composition comprising: a first resin component comprising an ethylene acrylic acid resin, an ethylene methacrylic acid resin or combinations thereof; and a second resin component present in an amount of about 20% to about 80% by weight of total solids content of the composition, the second resin component having a melting point of from about 50° C. to about 75° C., which is below the melting point of the first resin component, or from about 140° C. to about 180° C., which is above the melting point of the first resin component.

Abstract: A method for determining coat weight of a transparent primer coating for liquid electrophotographic printing processes is described, in which an optical brightening agent is added to an aqueous transparent primer composition in an amount of less than 0.1 wt. % based on the total solids content of the primer composition to produce a test composition, the test composition is applied onto a test substrate to produce a transparent primer coating, the fluorescence of the transparent primer coating is measured, and the coat weight of the transparent primer coating based on the fluorescence of the transparent primer coating is determined.

Abstract: Herein is disclosed a liquid electro photographic (LEP) printing composition comprising: a first resin component comprising an ethylene acrylic acid resin, an ethylene methacrylic acid resin or combinations thereof; and a second resin component present in an amount of about 20% to about 80% by weight of total solids content of the composition, the second resin component having a melting point of from about 50° C. to about 75° C., which is below the melting point of the first resin component, or from about 140° C. to about 180° C., which is above the melting point of the first resin component.

Abstract: There is provided a method for electrostatic printing comprising providing a print substrate having a layer comprising a polymeric material, the layer comprising a polymeric material having thereon a surface layer comprising an aminofunctional silane; carrying out an electrostatic printing process to transfer an ink onto the surface layer comprising the aminofunctional silane. Also disclosed herein are print substrates producible by the method, and print substrates for use in the method.

Abstract: The present disclosure is drawn to a method for improving the durability of an ink printed on a substrate. In an aspect, the method comprises: (a) providing a substrate having an ink printed thereon; (b) applying an organosilane to the ink to form a coating over the ink, wherein the organosilane is of the formula X—SiR1R2R3, wherein R1, R2 and R3 are all hydrolysable groups, and X comprises an a nucleophilic nitrogen-containing group which is covalently bonded to Si in X—SiR1R2R3 via a non-hydrolysable linker group; and (c) curing the organosilane. The present disclosure further describes a substrate having an ink printed thereon, wherein the ink has a coating thereon formed by applying an organosilane to the ink and curing the organosilane.

Abstract: There is provided a method for electrostatic printing comprising providing a print substrate having a layer comprising a polymeric material, the layer comprising a polymeric material having thereon a surface layer comprising an aminofunctional silane; carrying out an electrostatic printing process to transfer an ink onto the surface layer comprising the aminofunctional silane. Also disclosed herein are print substrates producible by the method, and print substrates for use in the method.

Abstract: The present disclosure is drawn to a method for improving the durability of an ink printed on a substrate. In an aspect, the method comprises: (a) providing a substrate having an ink printed thereon; (b) applying an organosilane to the ink to form a coating over the ink, wherein the organosilane is of the formula X—SiR1R2R3, wherein R1, R2 and R3 are all hydrolysable groups, and X comprises an a nucleophilic nitrogen-containing group which is covalently bonded to Si in X—SiR1R2R3 via a non-hydrolysable linker group; and (c) curing the organosilane. The present disclosure further describes a substrate having an ink printed thereon, wherein the ink has a coating thereon formed by applying an organosilane to the ink and curing the organosilane.