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OwnerHolger Tonniessen, Steve Hatfield +3inventors
InventorsHolger Tonniessen, Steve Hatfield, Annie Seiler, Rainer Rauberger, Ralf Grauel
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Method of bonding labels to hydrophobic substrates, a pressure-sensitive hotmelt adhesive being applied wholly or partly to the label or to the substrate at an area opposite the label, then bringing label and substrate together and bonding them, characterized in that the pressure-sensitive hotmelt adhesive is water-soluble in alkaline solution and the label is selected from i) water-permeable labels having a water absorbency (Cobb value) of greater than 0.3 g/m2 per 20 sec, ii) perforated labels which on the bonded surfaces have a perforation or cutouts of below 10%. Further described is a label which is coated with a water-soluble pressure-sensitive hotmelt adhesive and which exhibits a high water absorbency and/or, where appropriate, contains perforations or cutouts on the bonded surface.
A method for bonding a label onto a hydrophobic substrate comprising:
A label coated with a hot melt pressure sensitive adhesive, wherein the label has a Cobb value greater than 0.3 g/m2 per 20 seconds or a perforation level below 10%
A hot melt pressure sensitive adhesive comprising 5 to 50 wt. % of at least one base polymer and 15 to 85 wt. % of at least one water-soluble resin with an acid number between 90 mg KOH/g up to 220 mg KOH/g.
Dependencies are inferred from the claim text.