US 12,233,628 B2
Multilayer film
Jingbo Wang, Linz (AT); Markus Gahleitner, Linz (AT); Klaus Bernreitner, Linz (AT); Pauli Leskinen, Porvoo (FI); and Peter Niedersuss, Linz (AT)
Assigned to BOREALIS AG, Vienna (AT)
Appl. No. 17/273,372
Filed by BOREALIS AG, Vienna (AT)
PCT Filed Sep. 20, 2019, PCT No. PCT/EP2019/075299
§ 371(c)(1), (2) Date Mar. 4, 2021,
PCT Pub. No. WO2020/064534, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 18196881 (EP), filed on Sep. 26, 2018.
Prior Publication US 2021/0339509 A1, Nov. 4, 2021
Int. Cl. B32B 27/08 (2006.01); B32B 27/32 (2006.01); C08F 210/06 (2006.01); C08L 23/08 (2006.01); C08L 23/14 (2006.01)
CPC B32B 27/08 (2013.01) [B32B 27/325 (2013.01); B32B 27/327 (2013.01); C08F 210/06 (2013.01); C08L 23/08 (2013.01); C08L 23/142 (2013.01); B32B 2250/03 (2013.01); B32B 2250/246 (2013.01); B32B 2270/00 (2013.01); B32B 2307/31 (2013.01); B32B 2553/00 (2013.01)] 16 Claims
 
1. The multilayer film comprising at least three layers, one 1st sealing layer (SL1), one core layer (CL) and one outer layer (OL), the stacking order of the at least three layers is (SL1)/(CL)/(OL),
wherein:
(a) the 1st sealing layer (SL1) comprises at least 90 wt. %, based on the total weight of the 1st sealing layer (SL1), of a 1st base polymer composition (BC1), said 1st base polymer composition (BC1) comprises at least 70 wt. %, based on the total weight of the 1st base polymer composition (BC1), of a 1st linear low density polyethylene (LLDPE1), said 1st linear low density polyethylene (LLDPE1) has a density in the range of 0.890 to 0.925 g/cm3 measured according to ISO 1183-187;
(b) the core layer (CL) comprises at least 90 wt. %, based on the total weight of the core layer (CL), of a 2nd base polymer composition (BC2), wherein the core layer (CL) contains the 2nd base polymer composition (BC2) as the only polymer; and
(c) the outer layer (OL) comprises at least 90 wt. %, based on the total weight of the outer layer (OL), of a 3rd base polymer composition (BC3), said 3rd base polymer composition (BC3) comprises at least 90 wt. %, based on the total weight of the 3rd base polymer composition (BC3), of a polyolefin;
wherein said 2nd base polymer composition (BC2)
is a mixture of the propylene 1-hexene copolymer (PHC) and a plastomer (PL), said plastomer being an elastomeric copolymer of ethylene and at least one C4 to C10 α-olefin;
wherein said propylene 1-hexene copolymer (PHC) of the 2nd base polymer composition (BC2) has
(i) an 1-hexene content in the range of 2.0 to 5.0 wt. % based on the total weight of the propylene 1-hexene copolymer (PHC); and
(ii) a xylene soluble fraction (XCS) determined at 25° C. according to ISO 16152 in the range of 0.3 to 15.0 wt. % based on the total weight of the xylene soluble fraction (XCS) of the 1-hexene copolymer (PHC), the xylene soluble fraction (XCS) having a 1-hexene content in the range of 2.5 to 7.0 wt. %, based on the total weight of the xylene soluble fraction (XCS) of the propylene 1-hexene copolymer (PHC);
wherein the propylene 1-hexene copolymer (PHC) comprises:
(a) a 1st propylene 1-hexene copolymer (PHC-1) having an 1-hexene content in the range of 0.7 to 2.5 wt. % based on the total weight of the 1st propylene 1-hexene copolymer (PHC-1); and
(b) a 2nd propylene 1-hexene copolymer (PHC-2) having an 1-hexene content in the range of 2.8 to 5.5 wt. %, based on the total weight of the 2nd propylene 1-hexene copolymer (PHC-2).