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US 12,590,230 B2Granted
Adhesive film that can be wound and stamped
AssigneeLohmann GmbH & Co. KG
InventorsOliver Kühl, Ruben Friedland, Johannes Stahl, Cornelia Hoss
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Abstract
An adhesive film that can be wound and stamped having an epoxy-based adhesive compound that can be activated thermally or by UV radiation, and a dye and/or pigment mixed into the adhesive compound for producing a first color change after the activation of the adhesive compound and a second color change after the curing of the adhesive compound.
Claims14
An adhesive film that can be wound and stamped, comprising:
- a UV curable epoxy-based adhesive compound that is activated by UV radiation;
- and
- a dye and/or pigment mixed into the adhesive compound that produces a first color change after the UV activation of the adhesive compound and a second color change after a UV curing of the adhesive compound,
- wherein the UV curable adhesive compound of the adhesive film comprises a cationic initiator that is activated by the UV radiation, and the dye and/or pigment comprises a substance that produces the first color change as an effect of an acid produced by the UV activation of the cationic initiator and the second color change due to a decomposition of the acid after UV curing of the UV curable adhesive compound.
1 more element
Dependencies are inferred from the claim text.