Slip film for relief image printing element

摘要

A method of preparing a photosensitive printing blank, the method comprising the steps of: a) coating a slip film onto a coversheet and drying the slip film; and depositing at least one layer of photosensitive material on top of the slip film coated coversheet and laminating a substrate layer to the exposed surface of the photosensitive material. The slip film comprises: i) a polymer selected from the group consisting of polystyrene and polyvinylpyrrolidone; ii) optionally, an additive. The slip film at least substantially eliminates the formation of hot spots during an analog plate making process.

主权项

1. A method of preparing a photosensitive printing blank, the method comprising the steps of:
a) coating a slip film onto a coversheet and drying the slip film; and b) depositing at least one layer of photosensitive material on top of the dried slip film coated coversheet and laminating a substrate layer to an exposed face of the at least one layer of photosensitive material; wherein the slip film comprises:
i) a polymer selected from the group consisting of polystyrene and polyvinylpyrrolidone; andii) 0.1 to 5.0 percent by weight of an additive, where the additive is selected from the group consisting of ethylene glycol, propylene glycol, mineral oils, styrene-butadiene oils, butadiene oils, and copolymers of acetonitriles;wherein prior to drying, the slip film also comprises a solvent selected from the group consisting of toluene, acetone, primary alcohols, methylethyl ketone, 2-propanol, and combinations of one or more of the foregoing.