| abstract |
The document designed to prevent forgery or misuse is of laminated construction and can carry information on one or both sides, using a transparent layer to cover the information. The foil is coated with a layer of material brought into contact with the information carrying material and allowed to harden. Radiation can be used to assist hardening and an initiator or accelerator can be used with ultra violet radiation. The hardening substance can include an ethylene unsaturated monomer, oligomeric or polymeric binder and a photoinitiator. Instead of the photoinitiator, and polymerising initiator and an accelerator may be used. A large number of alternative substances are given. Specifically, polyester, alpha,beta-unsatd. polyesters, polyepoxide; polyurethane; urethane-modified polyepoxides, polyesters or polyethers; and other unsatd. polymers are claimed. |