Sealing device with increased concrete adhesion strength

1 . A sealing device comprising a functional layer having a first major surface and a second major surface and a barrier layer directly or indirectly connected to the second major surface of the functional layer, the functional layer comprising:

a) 20-75 wt.-%, of at least one thermoplastic polymer P 1 and

b) 40-75 wt.-% of a solid filler component F, all proportions being based on the total weight of the functional layer, wherein

the solid filler component F comprises at least one first solid filler F 1 having a median particle size d 50 in the range of 0.5-100 μm and at least one second solid filler F 2 different from the at least one first solid filler F 1 ,

the at least one first solid filler F 1 has a number average particle aspect ratio of not more than 2.5:1 and the at least one second solid filler F 2 has a number average particle aspect ratio of at least 4:1, wherein the particle aspect ratio is defined as a ratio of length and thickness of a particle measured using a dynamic image analysis method conducted according to ISO 13322-2:2006 standard, and

the at least one first solid filler F 1 comprises at least 65 wt.-% of the solid filler component F and the at least one second solid filler F 2 comprises not more than 30 wt.-% of the solid filler component F.

2 . The sealing device according to claim 1 , wherein the at least one second solid filler F 2 has a median particle length L 50 in the range of 5-350 μm and/or a L 90 particle length in the range of 15-500 μm.

3 . The sealing device according to claim 1 , wherein particles of the solid filler component F are distributed throughout the entire volume of the functional layer.

4 . The sealing device according to claim 1 , wherein the at least one first solid filler F 1 comprises at least one inert mineral filler F 11 and/or at least one hydraulic binder F 12 .

5 . The sealing device according to claim 4 , wherein the at least one inert mineral filler F 11 is selected from the group consisting of calcium carbonate, magnesium carbonate, diatomaceous earth, pumice, dolomite, xonotlite, perlite, barite, and comminuted concrete.

6 . The sealing device according to claim 1 , wherein the at least one second solid filler F 2 is selected from the group consisting of vermiculite, Wollastonite, mica, and talc.

7 . The sealing device according to claim 1 , wherein the functional layer has a mass per unit weight in the range of 100-1500 g/m 2 .

8 . The sealing device according to claim 1 , wherein the barrier layer comprises at least 50 wt.-% of at least one thermoplastic polymer P 2 .

9 . A method for producing a sealing device according to claim 1 , the method comprising a step of extruding or co-extruding a first molten polymer composition comprising the constituents of the functional layer through an extruder die.

10 . The method according to claim 9 , wherein the first molten polymer composition is obtained by melt-processing a first starting composition comprising the constituents of the functional layer.

11 . The method according to claim 9 , wherein the first molten polymer composition further contains a blowing gas, which is released from the first molten polymer composition through a surface of the functional layer discharged from the extruder die.

12 . A sealing device obtained by using the method according to claim 9 .

13 . A method for waterproofing a substrate, comprising:

providing the sealing device according to claim 1 ,

applying a layer of an adhesive composition on at least a portion of the surface of the substrate to form a first adhesive film and on the first major surface of the functional layer of the sealing device to form a second adhesive film, and

contacting the first and second adhesive films to affect adhesive bonding between the substrate and the sealing device.