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US 12,485,656 B2Granted
Multilayer film
AssigneeBorealis AG
InventorsJingbo Wang, Markus Gahleitner, Klaus Bernreitner, Pauli Leskinen, Peter Niedersuss
Life of this patent
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Abstract
Multilayer film of at least three layers, one core layer and at least one sealing layer wherein the sealing layer comprises a linear low density polyethylene having a density in the range of 0.915 to 0.925 g/cm3, and the core layer comprises a propylene 1-hexene copolymer, said copolymer has an 1-hexene content in the range of 2.0 to 5.0 wt.-% and a xylene soluble fraction in the range of 0.3 to 15.0 wt.-%.
Claims14
Base polymer composition (BPC) comprising:
- (a) 75 to 95 wt. %, based on the total weight of the base polymer composition (BPC), of a propylene 1-hexene copolymer (PHC) comprising a 1st propylene 1-hexene copolymer (PHC-1) and a 2nd propylene 1-hexene copolymer (PHC-2), and
- (b) 5 to 25 wt. %, based on the total weight of the 2nd base polymer composition (BC2), of a plastomer (PL) having a density in the range of 0.860 to 0.930 g/cm3 measured according to ISO 1183-187, said plastomer being an elastomeric copolymer of ethylene and at least one C4 to C10 α-olefin:
- wherein:
- (a1) said propylene 1-hexene copolymer (PHC) has 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);
- (a2) the propylene 1-hexene copolymer (PHC) has 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 propylene 1-hexene copolymer (PHC);
- (a3) said 1st propylene 1-hexene copolymer (PHC-1) has 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);
- (a4) said 2nd propylene 1-hexene copolymer (PHC-2) has 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);
- (a5) the total amount of the 1st propylene 1-hexene copolymer (PHC-1) and the 2nd propylene 1-hexene copolymer (PHC-2) together based on the total weight of the propylene 1-hexene copolymer (PHC) is at least 95 wt. %;
- and
- (a6) the weight ratio [(PHC-1)/(PHC-2)] between the 1st propylene 1-hexene copolymer (PHC-1) and the 2nd propylene 1-hexene copolymer (PHC-2) is in the range of 30/70 to 50/50;
- and
- wherein the plastomer (PL) has a melt flow rate MFR2 (190° C./2.16 kg) measured according to ISO 1133 in the range of 0.1 to 1.1 g/10 min.
9 more elements
Dependencies are inferred from the claim text.