Label adhesive and activation method for polymeric label
AssigneeLubrizol Advanced Materials, Inc.
InventorsLawrence J. Schnieders, Alexander V. Lubnin
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Abstract
A water activated adhesive system is described that is particularly suited for applying non-paper polymeric labels to surfaces which have low moisture permeability. The adhesive system is characterized by a dry non-tacky surface that becomes tacky in less than one second when contacted with a water-based activator. While it is a water activated adhesive, it is also characterized after aging bonded to a substrate by resistance to adhesive failure during 72 hours of immersion in ice/water mixture. The adhesive is beneficial to allow use of existing paper labeling equipment with polymeric labels.
Claims20
An adhesive system for fastening a non-paper polymeric label or metal foil to a surface, said adhesive system comprising:
- a) a film from at least two polymer fractions comprising a1) at least 5 wt. % of a hydrophilic polymer characterized as being an addition polymer that is a water soluble hydrophilic polymer and a2) at least 50 wt. % of a less hydrophilic polymer being characterized as an addition polymer having a glass transition temperature from about 10° C. to about 50° C. that is not water soluble and
- b) a water-based activation solution, wherein said film and activation solution are characterized by the conversion of said film from a non-tacky state to a tacky state in less than one second upon contact with said water-based activation solution wherein said less hydrophilic polymer is a copolymer comprising repeat units 10-85 wt. % of repeat units derived from C1-C15 alkyl esters of (meth)acrylic acid monomer and 5-40 wt. % of repeat units from polar monomer containing carboxylic, sulfonic, sulfate, phosphate, and/or phosphonic acids groups and/or their salts.
Dependencies are inferred from the claim text.