US 11,731,404 B2
Multilayer film having high tear strength
Michael Schuhmann, Cadolzburg (DE); Matthias Mauser, Hausen (DE); Christian Hermann, Eggolsheim (DE); and Peter Wieland, Forchheim (DE)
Assigned to LOPAREX GERMANY GMBH & CO. KG, Forchheim (DE)
Appl. No. 16/647,888
Filed by LOPAREX GERMANY GMBH & CO. KG, Forchheim (DE)
PCT Filed Sep. 18, 2018, PCT No. PCT/EP2018/075151
§ 371(c)(1), (2) Date Mar. 17, 2020,
PCT Pub. No. WO2019/057688, PCT Pub. Date Mar. 28, 2019.
Claims priority of application No. 10 2017 122 004.6 (DE), filed on Sep. 22, 2017.
Prior Publication US 2020/0223192 A1, Jul. 16, 2020
Int. Cl. B32B 27/08 (2006.01); B32B 27/32 (2006.01); B32B 27/34 (2006.01); B29C 48/08 (2019.01); B29C 48/10 (2019.01); B29C 48/21 (2019.01); E04D 5/10 (2006.01); B32B 11/04 (2006.01)
CPC B32B 27/08 (2013.01) [B32B 11/046 (2013.01); B32B 27/32 (2013.01); B32B 27/34 (2013.01); B32B 2307/582 (2013.01); B32B 2307/7265 (2013.01); B32B 2405/00 (2013.01)] 20 Claims
 
1. A multilayer film comprising:
(a) one layer (a) based on
at least one propylene copolymer in an amount of at least 15% by weight,
at least one propylene homopolymer in an amount of at least 40% by weight, and
optionally up to 30% by weight of additives, based in each case on the total weight of the layer (a), the components always adding up to 100% by weight,
(b) one multi-ply, inner layer (b) based on at least one homo- and/or copolyamide having isophoronediamine units as a polyamide component,
(c) one layer (c) based on
at least one propylene copolymer in an amount of at least 15% by weight,
at least one propylene homopolymer in an amount of at least 40% by weight, and
optionally up to 30% by weight of additives, based in each case on the total weight of the layer (c), the components always adding up to 100% by weight, and
(d) one adhesion-promoter layer (d) arranged between the layer (a) and the layer (b), based on at least one modified thermoplastic olefin homo- or copolymer,
(e) one adhesion-promoter layer (e) arranged between the layer (b) and the layer (c), based on at least one modified thermoplastic olefin homo- or copolymer, the thickness of the multi-ply layer (b) being at least 40% of the total thickness of the multilayer film.