Contact layer with mineral binder component

1. A contact layer comprising a mineral binder component B, a thermoplastic polymer component P and a surfactant component S,

wherein the amount of the mineral binder component B is in a range of 10.0 to 90.0 wt.-% based on the total weight of the contact layer,

the thermoplastic polymer component P comprises at least one polymer selected from the group consisting of ethylene-vinyl acetate co-polymers (EVA), ethylene-acrylic ester copolymers, ethylene-α-olefin co-polymers, ethylene-propylene co-polymers polypropylene (PP), polyethylene (PE), polyvinylchloride (PVC), polyethylene terephthalate (PET), polystyrene (PS), polyamides (PA), chlorosulfonated polyethylene (CSPE), ethylene propylene diene rubber (EPDM), and polyisobutylene (PIB),

the contact layer is formed by extruding a homogenized melt comprising the mineral binder component B, the thermoplastic polymer component P, and the surfactant component S through a manifold or a flat die followed by cooling the extruded material between calendar cooling rolls, the homogenized melt being formed by melt-processing a composition comprising the mineral binder component B, the thermoplastic polymer component P, and the surfactant component S at a temperature, which is above the melting point of point of the thermoplastic polymer component P, and

the amount of water in the homogenized melt is less than 1.0 wt.-%.

2. The contact layer according to claim 1 comprising not more than 3.0 wt.-% based on the total weight of the contact layer.

3. The contact layer according to claim 1 , wherein the contact layer has a concrete adhesion strength of at least 5 N/50 mm.

4. The contact layer according to claim 1 , wherein the mineral binder component B comprises at least one mineral binder selected from the group consisting of hydraulic binders, non-hydraulic binders, latent hydraulic binders, and pozzolanic binders, and mixtures thereof.

5. The contact layer according to claim 1 , wherein the surfactant component S comprises at least one surfactant selected from the group consisting of anionic, cationic, non-ionic, amphoteric, and polymeric surfactants, and mixtures thereof.

6. The contact layer according to claim 5 , wherein the at least one surfactant is selected from the group consisting of glycerol monostearates, polycarboxylate ethers, polyether-modified polysiloxanes, polyalkylene oxide siloxanes, hydroxyethyl amines, erucamides, stearyl stearamides, alkali metal alkanesulfonates, alkyl aryl sulfonates, and mixtures thereof.

7. The contact layer according to claim 1 , wherein the amount of the surfactant component S is in a range of 0.1 to 15.0 wt.-% based on the total weight of the contact layer.

8. The contact layer according to claim 1 , wherein the amount of the thermoplastic polymer component P is in a range of 20.0 to 85.0 wt.-% based on the total weight of the contact layer.

9. The contact layer according to claim 1 , wherein the contact layer has a thickness in a range of 0.1 to 50.0 mm.

10. A method for producing a contact layer according to claim 1 , wherein the method comprises extruding and/or calendering a homogenized melt comprising the components of the contact layer.

11. A method for binding substrates to each other, the method comprising steps of:

a) applying a layer of first adhesive on the surface of a first substrate,

b) covering the layer of the first adhesive with the contact layer according to claim 1 such that a first surface of the contact layer is brought in contact with the layer of the first adhesive,

c) applying a layer of a second adhesive on the second opposite surface of the contact layer and contacting the layer of the second adhesive with the surface of the second substrate or applying a layer of a second adhesive on a surface of the second substrate and contacting the layer of the second adhesive with the second opposite surface of the contact layer,

d) hardening the layers of the first and second adhesives,

wherein at least one of the first and second adhesives is a fresh cementitious composition or a synthetic resin composition.

12. A method for waterproofing a substrate, the method comprising steps of

applying a contact layer according to claim 1 to a surface of a substrate such that a first surface of the contact layer is directed against the surface of the substrate,

casting a fresh cementitious composition on a second opposing surface of the contact layer, and

hardening the fresh cementitious composition.

13. A waterproofed construction comprising a layer of concrete and a contact layer according to claim 1 arranged between a surface of a substrate and the layer of concrete such that the first surface of the contact layer is directed against a surface of a substrate and the second surface of the contact layer is fully bonded to the layer of concrete.

14. A method for sealing a substrate against water penetration, the method comprising steps of

applying a layer of adhesive on the surface of the substrate,

covering the layer of the adhesive with a contact layer according to claim 1 such that one of the surfaces of the contact layer is brought in contact with the layer of adhesive, and

hardening the layer of adhesive.

15. A sealed construction comprising a contact layer according to claim 1 and a layer of adhesive arranged between a surface of a substrate and the contact layer such that one of the surfaces of the contact layer is bonded to the surface of the substrate with the layer of adhesive.

16. A method according to claim 1 for producing the contact layer as a waterproofing membrane.

17. The contact layer according to claim 1 , wherein the amount of the mineral binder component B is in a range of 20.0 to 85.0 wt.-% based on the total weight of the contact layer.

18. The contact layer according to claim 1 , wherein the mineral binder component B is dispersed uniformly throughout the thermoplastic polymer component P in the contact layer.