Labels with water-soluble uv curable adhesives

Abstract

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.

Description

technical field [0001] The present invention relates to a method of adhesively bonding a label to a substrate wherein the adhesive is a radiation crosslinkable pressure sensitive adhesive which can be dissolved from the surface of the substrate by an aqueous alkaline solution. Furthermore, the present invention relates to labels coated with a redissolvable radiation crosslinkable pressure sensitive adhesive which can be releasably adhesively bonded to a substrate having a hard surface. In addition, radiation-crosslinkable pressure-sensitive adhesives that are soluble in aqueous solutions are described. Background technique [0002] WO 97 / 01483 describes adhesive systems for adhesively bonding labels, wherein liquid pick-up adhesives and lamination adhesives are described, which bond substrates together in-line. These are designed to be soluble in alkali, ie in alkaline sodium hydroxide solution at high temperature, the adhesive becomes detached and thus the label can be rem...

AI Technical Summary

Problems solved by technology

Paper labels are advantageously used, label separation can be done by aqueous alkaline solution as above, but these are not transparent and are therefore less favorable for many applications

[0008] Furthermore, the applica