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AssigneeHenkel AG & Co. KGaA
InventorsHolger Tonniessen, Annie Seiler, Rainer Rauberger, Ralf Grauel
Estimating the term…
The invention relates to a method for gluing labels on hydrophobic substrates, wherein a radiation cross-linking, pressure-sensitive adhesive is applied on the label or on the substrate on a surface opposite to the label and irradiated with UV or electron radiation, and label and substrate are then brought together and glued to one another. The pressure-sensitive adhesive is soluble in aqueous solutions. The label is selected from i) water permeable labels with a water uptake (Cobb value) greater than 0.2 g/m2 per 20 sec, and ii) perforated labels which have perforations or cut-outs of less than 10% on the glued surfaces. Furthermore, the invention describes a label, coated with a water-soluble, radiation curable, pressure sensitive adhesive, which has a high water uptake and/or optionally perforations or cut-outs on the glued surface.
A method of adhesively bonding labels to hydrophobic substrates, in which a radiation-crosslinkable pressure-sensitive adhesive is applied to all or part of the label or of the substrate on a surface facing the label, and label and substrate are brought together and adhesively bonded, wherein prior to adhesive bonding the pressure-sensitive adhesive is crosslinked by irradiation with actinic radiation to yield an adhesive layer, wherein said adhesive layer is soluble in aqueous solution and the label is selected from i) water-permeable labels with a water absorption (Cobb value) greater than 0.2 g/m2 per 20 sec, ii) perforated labels, which have perforations or cut-outs over less than 10% of the adhesively bonded areas.
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A label coated with a pressure-sensitive adhesive crosslinkable by actinic radiation, which adhesive is soluble or dispersible in aqueous solution under heat, wherein the label is i) water-permeable with a water absorption (Cobb value) of greater than 0.3 g/m2 per 20 sec, and/or ii) has perforations or cut-outs over less than 10% of the adhesively bonded areas.
A water-soluble pressure-sensitive adhesive for adhesively bonding labels, wherein the pressure-sensitive adhesive contains at least 70 to 95 wt. % of a base polymer, which is crosslinkable by actinic radiation, and 5 to 30 wt. % of a resin, wherein after irradiation the base polymer comprises groups promoting water solubility, and optionally further additives.
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Dependencies are inferred from the claim text.