SECURITY PAPER AND THE MANUFACTURE THEREOF

摘要

IMPROVEMENTS IN SECURITY PAPER AND THE MANUFACTURE THEREOF The invention concerns security paper in which paper is printed with a security ink including a security agent to a designed representation for detection by a short or long wave ultra-violet light source. The paper is provided with a specially formulated dense opaque coating which obscures the security representation. The coating provides a surface for printing by conventional techniques whilst the coating does not interfere with the desired detection of the phosphorescent or fluorescent security agent. The coating is applied as a slip and includes china clay in a binder having in an exemplary composition an acrylic resin with dispersant and selected wetting and keying agents.