Abstract: The invention relates to an adhesive tape which proves that a package has been opened in an unauthorised manner, comprising a composite cyclic polyolefin based support covered on one side with an adhesive material.

Abstract: The invention relates to a method for the production of a contact adhesive material based on acrylates, characterised in that a) firstly, (co-) polymers are produced by free radical polymerisation from the following monomers: i) a mixture of acrylic monomers, or of acrylic and vinylic monomers, ii) monomers, which contain vinyl groups and with at least one other functional group which is unreactive with relation to radical polymerisations and which is chosen such that it may participate in polymerisation-like reactions with isocyanate groups, making up from 0.1 to 25 wt. % of the monomer mixture, b) by means of a further reaction under addition of isocyanatoethyl acrylate and/or isocyanatoethyl methacrylate, double bonds are introduced along the polymer chain and c) a cross-linking of the polymers is achieved by means of irradiation with energetic radiation after the reaction between the functional groups and the isocyanate groups.

Abstract: The use of a multilayer adhesive tape having a backing based on an oriented thermoplastic film, an upper surface and a lower surface, to whose lower surface at least the following layers have been applied: