| 摘要 |
A security document comprising a plurality of self-supporting polymeric films and layers therebetween and thereon, said plurality of self-supporting polymeric films comprising a non-transparent microvoided axially stretched self-supporting polymeric film exclusive of foam and having a permanent transparent pattern; and a process for producing a security document with a permanent transparent pattern comprising the step of: image-wise application of heat optionally supplemented by the application of pressure to a security document precursor comprising a plurality of self-supporting polymeric films and layers therebetween and thereon, said plurality of self-supporting polymeric films comprising a non-transparent microvoided axially stretched self-supporting polymeric film exclusive of foam. |
