Bayer Aktiengesellschaft

Ciba-geigy Corporation

Agfa-gevaert Ag

Karl-Friedrich Neuhaus

Hermann Perrey

Otto Bendszus

Hans Rudolph

Hans-Georg Heine

Hans J Rosenkranz

Karl Fuhr

Manfred Dollhausen

Horst Muller-Albrecht

Hans-Dieter Scharf

Herbert Frauenrath

Hans-Joachim Freier

2-Acylated dihydro-1,3-dioxepins proved to be highly reactive photoinitiators having a low tendency towards yellowing.

2-Acylated dihydro-1,3-dioxepins, process for the production thereof and

A film is bonded to a substrate by applying a layer of adhesive to the film to be bonded, contacting the film with a substrate and subjecting the adhesive to high energy radiation either before, during or after the film and substrate are contacted. The adhesive layer is from 0.5 to 20 .mu.m thick. The adhesive employed is a mixture of at least one polyisocyanate and at least one compound containing both a (meth)acryloyl group and a hydroxyl group in which the equivalent ratio of hydroxyl to isocyanate groups is from 0.8 to 1 to 1.3 to 1. The substrate to which the film is to be bonded may also be a film. Composites formed in accordance with the present invention are characterized by high initial bond strengths.

Process for bonding films

The process relates to the production of tamperproof documents by laminating an information carrier on one or both sides with foils which have an adhesive layer which is hardened by radical cross-linking.

Process for the production of documents which cannot be falsified

A radiation-hardenable binder comprising a reaction product ester containing hydroxyl groups and hydroxyalkyl acrylates, which comprises:

Radiation-hardenable acrylic acid esters containing urethane groups and

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Krefeld, Germany

Karl-Friedrich Neuhaus