Multilayered Foil, Sealing Material, Their Use and Production
At least one embodiment provides a multilayered foil ( 100 ) having a first outer layer ( 10 ) and a second outer layer ( 30 ), which each comprise homo polypropylene. A central layer ( 20 ) is disposed between the first outer layer ( 10 ) and the second outer layer ( 30 ) and contains more than 25 wt % of homo polyamide and comprises copolyamide. The first outer layer ( 10 ) comprises microspheres ( 50 ).
1 . A multilayered foil, comprising:
a first outer layer, which comprises homo polypropylene;
a second outer layer, which comprises homo polypropylene; and
a central layer, which is disposed between the first outer layer and the second outer layer and which contains more than 25 wt % of homo polyamide and comprises copolyamide;
wherein the first outer layer comprises microspheres.
2 . The multilayered foil according to claim 1 , wherein the microspheres have an average diameter in the range from 50 to 300 μm.
3 . The multilayered foil according to claim 1 , wherein the first outer layer contains 0.1% to 2.0 wt % of microspheres.
4 . The multilayered foil according to claim 1 , wherein the microspheres have a shell which surrounds a hollow space and which consists of thermoplastic polymer to an extent of at least 70 wt %.
5 . The multilayered foil according to claim 1 , wherein the first outer layer and/or the second outer layer contains at least 40 wt % homo polypropylene, especially in the range from 50 to 90 wt %.
6 . The multilayered foil according to claim 1 , wherein the first outer layer and/or the second outer layer contains 10 to 40 wt % ethylene-acrylate copolymer.
7 . The multilayered foil according to claim 1 , wherein the first outer layer and the second outer layer each independently contains 55 to 80 wt % homo polypropylene and 15 to 35 wt % ethylene-acrylate copolymer.
8 . The multilayered foil according to claim 7 , wherein the first outer layer and/or the second outer layer aside from homo polypropylene and ethylene-acrylate copolymer contains less than 15 wt % of further polymeric compounds.
9 . The multilayered foil according to claim 1 , wherein the central layer contains at least 30 wt % of copolyamide.
10 . The multilayered foil according to claim 1 , wherein the central layer contains 30 to 60 wt % homo polyamide and 40 to 70 wt % copolyamide.
11 . The multilayered foil according to claim 1 , wherein the central layer comprises polyamide 6 as homo polyamide and the copolyamide contains isophoronediamine units.
12 . The multilayered foil according to claim 1 , wherein a first adhesion promoter layer is disposed between the first outer layer and the central layer and a second adhesion promoter layer is disposed between the second outer layer and the central layer.
13 . The multilayered foil according to claim 1 , wherein an adhesive layer is disposed on that side of the second outer layer which is remote from the central layer.
14 . A method for producing a multilayered foil according to claim 1 , wherein at least the first outer layer, the second outer layer and the central layer disposed therebetween are produced by co-extrusion to form the multilayered foil.
15 . A coating, sealing material or adhesive tape comprising a multilayered foil according to claim 1 .
16 . A sealing material, comprising a water-impermeable and/or water-repellent material and a multilayered foil according to claim 1 disposed thereon.
17 . A building material, roof covering, exterior cladding, buildings covering or parts of buildings covering or pipe cladding, comprising the sealing material according to claim 16 .