US 12,434,460 B2
Flexible multilayer film having high low-temperature impact strength for medical packagings
Susanne Holzer, Ottweiler (DE); and Rene Gross, Neunkirchen (DE)
Assigned to PolyCine GmbH, Schiffweiler (DE)
Appl. No. 18/549,270
Filed by PolyCine GmbH, Schiffweiler (DE)
PCT Filed Mar. 7, 2022, PCT No. PCT/EP2022/055728
§ 371(c)(1), (2) Date Sep. 6, 2023,
PCT Pub. No. WO2022/189345, PCT Pub. Date Sep. 15, 2022.
Claims priority of application No. 21161580 (EP), filed on Mar. 9, 2021.
Prior Publication US 2024/0165931 A1, May 23, 2024
Int. Cl. B32B 27/08 (2006.01); B32B 27/30 (2006.01); B32B 27/32 (2006.01); B32B 37/12 (2006.01); B32B 37/15 (2006.01); C08L 23/12 (2006.01)
CPC B32B 27/08 (2013.01) [B32B 27/302 (2013.01); B32B 27/32 (2013.01); B32B 37/1284 (2013.01); B32B 37/153 (2013.01); C08L 23/12 (2013.01); B32B 2250/246 (2013.01); B32B 2307/308 (2013.01); B32B 2307/558 (2013.01); B32B 2307/7376 (2023.05); B32B 2439/80 (2013.01)] 19 Claims
 
1. A heat-sterilizable multilayer film comprising
a) a first polymer layer (A) containing at least one polypropylene homopolymer modified with at least one impact modifier;
b) a second polymer layer (B) containing:
B1) 51% to 68% by weight, based on (B), of at least one polypropylene terpolymer;
B2) 12% to 22% by weight, based on (B), of at least one styrene block copolymer (SBC) elastomer; and
B3) 15% to 35% by weight, based on (B), of at least one propylene-ethylene copolymer, wherein, based on (B3), the proportion of the structural units of ethylene is ≥9% by weight; and
c) a central polymer layer (C) situated between the first polymer layer (A) and the second polymer layer (B), containing:
C1) 20% to 30% by weight, based on (C), of at least one styrene block copolymer (SBC) elastomer;
C2) 15% to 30% by weight, based on (C), of at least one polyethylene elastomer which is a copolymer of ethylene with an alpha-olefin containing 4 to 12 carbon atoms; and
C3) 40% to 65% by weight, based on (C), of at least one propylene-ethylene copolymer, wherein, based on (C3), the proportion of the structural units of ethylene is ≥9% by weight.