The surface of the printing paper is generally coated with an overlay. A transparent coating containing PVP allows the printing ink to dry quickly on it. The transparent layer has good ink absorbency, insoluble in water, and has good coagulability and diffusivity. And high-speed imaging due to transparency. Especially suitable for multi-color ink printing.
PVP can also be used in the preparation of conductive coatings. A conductive plastic film made to prevent electrostatic hazards is made by thinly coating the plastic film with a conductive transparent coating containing carbon black and a binder, and then coating it with a transparent protective layer. PVP is used here as a carbon black binder. In the past, water-soluble polyvinyl acetate alkalinates were used as binders, but satisfactory diluents could not be obtained, and there were problems such as drying difficulty and poor leveling. If PVP is used instead, a conductive coating with good conductivity and transparency, uniform coating and easy drying can be obtained. Generally, the molecular weight of PVP is 10000, because low molecular weight PVP is also beneficial to carbon black dispersion. In addition, if the coating content needs to be increased, it can be adjusted by adding polymer PVP.
