US 12,264,235 B2
Polypropylene composition for film sealing layer
Jingbo Wang, Linz (AT); Klaus Bernreitner, Linz (AT); Markus Gahleitner, Linz (AT); and Pauli Leskinen, Porvoo (FI)
Assigned to BOREALIS AG, Vienna (AT)
Appl. No. 17/312,758
Filed by BOREALIS AG, Vienna (AT)
PCT Filed Dec. 5, 2019, PCT No. PCT/EP2019/083769
§ 371(c)(1), (2) Date Jun. 10, 2021,
PCT Pub. No. WO2020/126516, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 18215213 (EP), filed on Dec. 21, 2018.
Prior Publication US 2022/0017734 A1, Jan. 20, 2022
Int. Cl. C08L 23/14 (2006.01); C08J 5/18 (2006.01)
CPC C08L 23/142 (2013.01) [C08J 5/18 (2013.01); C08J 2323/16 (2013.01); C08J 2423/14 (2013.01); C08L 2203/162 (2013.01); C08L 2205/025 (2013.01); C08L 2314/02 (2013.01); C08L 2314/06 (2013.01)] 12 Claims
 
1. Polypropylene composition (PP) comprising a blend of:
(a) 75.0 to 95.0 wt % of a propylene-ethylene random copolymer (A) having:
(a1) ethylene content in the range of from 1.5 to 6.0 wt %;
(a2) MFR2, 230° C., 2.16 kg, ISO1133, in a range of from 1.5 to 20.0 g/10 min;
(a3) melting temperature Tm, DSC, is in the range of from 135° C. to 155° C.; and
(b) 5.0 to 25.0 wt % of a component (B) selected from a propylene-hexene random copolymer (B1) having:
(b1) hexene content in the range of from 3.0 to 5.5 wt %;
(b3) MFR2, 230° C., 2.16 kg, ISO1133, in a range of from 1.5 to 20.0 g/10 min;
(b4) melting temperature Tm, DSC, in the range of from 125° C. to 145° C., based on the total weight of the sum of the component (A) and component (B), whereby the MFR2, 230° C., 2.16 kg, ISO1133, of the blend is in a range of from 1.5 to 20.0 g/10 min, and a weight ratio of component (A) and component (B) is from 3:1 to 12:1.