Hoechst Aktiengesellschaft

Manfred Unger

Klaus Hoheisel

Helmut Schafer

Roland Moraw

Siegfried Janocha

Helmut Walter

Rolf Bergmann

Helmut Sch/a/ Fer

Disclosed is a method of manufacturing multilayer identity cards by electrophotographically reproducing identity information on a card core material and then laminating protective film on both sides of the core material. In preferred embodiments, the core material itself may be made up of several layers with additional security markings thereon. A relief grid image or a hologram can be inserted into the card core prior to lamination. In a further embodiment, after lamination, the identity card blank is photomechanically scanned and positioned in accordance with existing control marks and punched to produce the finished identity card.

Process for the manufacture of identity cards

The film disclosed in the application is secure against forgeries and serves for marking articles, in particular high-quality branded goods. It is comprised of at least one transparent polyester film oriented by stretching and containing in its composition an organic dyestuff which is heat stable at temperatures above about 260.degree. C. Preferably, a laminate is used which is comprised of two films, one of which contains a different colored dyestuff than does the other.

Forgery-resistant film and method of using same

Forgery-resistant film

Disclosed is a composition, comprising a calcium-containing polyethylene terephthalate polymer and from about 0.01 to 1% by weight of silica obtained by a pyrogenic process, as well as a method of producing same and improved shaped articles made from said composition.

Polyethylene terephthalate composition and shaped articles

This invention relates to a leader of an information carrier web suitable for photoelectric control, comprising a polyester film oriented by biaxial stretching, having one layer, and a transparency of at least 60 per cent when exposed to light of a wavelength of 750 nm.

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Schlangenbad, Germany

Manfred Unger