Patent ID: 6419987
Filing Date: 2002-07-16
Classification: B41M,G03C

Abstract:
A method for coating a polyester web in a photothermographic element comprising:(a) coating a surface of said polyester web, optionally precoated with one or more previous coating layers, with a first liquid composition comprising a borate salt and a binder to form a preliminary coating, (b) drying the preliminary coating, and (c) coating said web with a second liquid composition comprising polyvinyl alcohol to form a photosensitive image-functional emulsion layer for the photothermographic element, wherein said borate salt is solubilized into the second liquid composition and interacts with the polyvinyl alcohol to form a crosslinked mixture having an increased viscosity on drying, such that the second liquid composition quickly thickens after application, wherein the polyester web comprises a thermoplastic resin selected from the group consisting of polyethylene terephthalate and polyethylene naphthalate, and blends thereof.