Fluid activatable adhesives for glue-free, liner-free, labels for glass and plastic substrates and methods of use thereof
AssigneeNuLabel Technologies, Inc.
InventorsRaymond Thibault, Heidi Munnelly
Life of this patent
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Abstract
A fluid activatable adhesive for a liner-free label and methods of using are described. Preferably, the adhesive composition includes a polymer, such as an emulsion polymer formed from monomers selected from the group consisting of butyl acrylate, 2-ethylhexyl acrylate, methyl acrylate, 2-acrylamido-2-methylpropane sulfonic acid (AMPS), a salt of AMPS, such as its sodium salt, styrene, and combinations thereof. The adhesive composition adheres to the liner-free label to the surface of a substrate that is at room temperature, at room temperature and wet, cold, or cold and wet. In preferred embodiments, the substrate is glass or plastic, such as polyethylene terephthalate.
Claims20
A liner-free label comprising a non-tacky polymeric coating on a face sheet, wherein the polymeric coating comprises a polymeric resin and an emulsion polymer comprising one or more monomers selected from the group consisting of 2-acrylamido-2-methylpropane sulfonic (AMPS) acid, a salt of AMPS, and a combination thereof,
- wherein the percent composition of AMPS, the salt of AMPS, or the combination thereof is between about 10% wt/wt and about 20% wt/wt of the emulsion polymer;
- and
- wherein the polymeric resin comprises a polymer selected from the group consisting of polystyrene acrylic, styrene-maleic anhydride resins, esters of styrene-maleic anhydride resin, styrene-maleic anhydride amic acid resin, styrene-maleic anhydride imide resin, and ammonium and alkali metal salts of styrene-maleic anhydride resin.
A method for applying a liner-free label to a substrate, wherein the label comprises a non-tacky polymeric coating on a face sheet, the method comprising:
- (a) activating the polymeric coating with an activation fluid comprising water and one or more organic solvents to form a tacky coating, and
- (b) contacting the label to the substrate,
- wherein the polymeric coating comprises a polymeric resin and an emulsion polymer comprising one or more monomers selected from the group consisting of 2-acrylamido-2-methylpropane sulfonic (AMPS) acid, a salt of AMPS, and a combination thereof,
- wherein the percent composition of AMPS, the salt of AMPS, or the combination thereof is between about 10% wt/wt and about 20% wt/wt of the emulsion polymer, and
- wherein the polymeric resin comprises a polymer selected from the group consisting of polystyrene acrylic, styrene-maleic anhydride resins, esters of styrene-maleic anhydride resin, styrene-maleic anhydride amic acid resin, styrene-maleic anhydride imide resin, and ammonium and alkali metal salts of styrene-maleic anhydride resin.
Dependencies are inferred from the claim text.