HMPSA for debondable self-adhesive label

1. A hot-melt pressure-sensitive adhesive (HMPSA) composition comprising:

a) 25 to 50% by weight of one or more styrene block copolymers chosen from polystyrene-polybutadiene-polystyrene (SBS), polystyrene-polyisoprene-polystyrene(SIS), polystyrene-polyisoprene-polybutadienepolystyrene(SIBS), polystyrene-poly(ethylenebutylene)-polystyrene (SEBS), or polystyrene-poly(ethylenepropylene)-polystyrene (SEPS);

b) 35 to 72% by weight of one or more compatible tackifying resins which are liquid or have a softening temperature below 150° C.; and

c) 3 to 20% by weight of one or more supramolecular polymers obtained by reaction between:

1-(2-aminoethyl)-2-imidazolidone (also called Ureido DiEthylene TriAmine or UDETA):

 and

a fatty acid composition comprising:

51 to 100% by weight of one or more dimers and/or trimers of identical or different fatty acids; and

0 to 49% by weight of one or more monomers of identical or different fatty acids.

2. The HMPSA of claim 1 , wherein the content of the one or more styrene block copolymer is 30 to 50% by weight.

3. The HMPSA of claim 1 , wherein the one or more styrene block copolymer is a linear or radial polystyrene-polyisoprene-polystyrene(SIS).

4. The HMPSA of claim 1 , wherein the tackifying resin is liquid or has a softening temperature between 90 and 120° C.

5. The HMPSA of claim 1 , wherein the tackifying resin content is between 40 and 55% by weight.

6. The HMPSA of claim 1 , wherein the supramolecular polymer is obtained by reaction, in stoichiometric quantities, of UDETA of formula (I) with a monomeric, dimeric, and/or trimeric fatty acid composition resulting from the polymerization of C 18 unsaturated monomeric fatty acids, wherein said fatty acid composition comprises 0 to 10% by weight of monomers and 90 to 100% by weight of a mixture of dimers and trimers.

7. The HMPSA of claim 1 , wherein the fatty acid composition with which the UDETA of formula (I) is reacted comprises 0 to 5% by weight of monomers and 95 to 100% by weight of a mixture of dimers and trimers.

8. The HMPSA of claim 1 , wherein the supramolecular polymer content is between 3 and 15% by weight.

9. The HMPSA of claim 1 , wherein the HMPSA further comprises 0.1 to 2% by weight of one or more stabilizers or antioxidants.

10. A multilayer system comprising:

an adhesive layer consisting of the HMPSA of claim 1 ;

a printable support layer adjacent to said adhesive layer, consisting of paper or a polymer film having one or more layers; and

a protective layer adjacent to said adhesive layer.

11. The multilayer system of claim 10 , wherein the multilayer system uses, as printable support layer:

paper with a weight of between 60 and 110 g/m 2 ;

a heat-shrinkable film made of polyethylene terephthalate (PET), polyvinyl chloride (PVC), or oriented polypropylene (OPP); or

an OPP/PET bilayer film, wherein the OPP layer is adjacent to the adhesive layer.

12. The multilayer system of claim 10 , wherein the thickness of the adhesive layer corresponds to an amount of HMPSA between 7 and 50 g/m 2 , expressed per unit area of the support layer.

13. A self adhesive label comprising the multilayer system of claim 10 .

14. An article labelled with the self-adhesive label of claim 13 .

15. The article of claim 14 , consisting of a package or container made of glass or a plastic, wherein the package or container is labelled with the self-adhesive label.

16. The article of claim 15 , wherein the package or container is made of a glass bottle.