Repulpable adhesives
The invention relates to an adhesive according to a conventional formulation, comprising additives capable of binding metal ions in the sense of chemical interactions, electrochemical interactions and/or physical interactions.
1. A pressure-sensitive adhesive formulation comprising copolymers of (meth)acrylic acid with esters of (meth)acrylic acid wherein the amount of (meth)acrylic acid in said copolymers amounts to more than 20% by weight, and additives capable of binding metal ions by chemical interaction, electrochemical interaction and/or physical interaction selected from the group consisting of polyphosphates, phosphonates, trisodium phosphate, ammonium phosphate and mixtures thereof.
2. Adhesive formulation according to claim 1 , wherein said metal ions are alkaline earth metal ions.
3. Adhesive formulation according to claim 1 , wherein the adhesive has a (meth)acrylic acid fraction of more that 30% by weight.
4. The adhesive formulation of claim 2 , where said alkaline earth metal ions are calcium(II) ions and/or magnesium(II) ions.
5. The adhesive formulation of claim 1 , wherein said additives are ammonium dihydrogen phosphate and/or diammonium hydrogen phosphate.
6. The adhesive formulation of claim 3 , wherein said (meth)acrylic acid fraction is more than 50% by weight.