	US 11,993,701 B2
	Polypropylene composition
Markus Gahleitner, Linz (AT); Jingbo Wang, Linz (AT); Klaus Bernreitner, Linz (AT); Peter Niedersüss, Linz (AT); Friedrich Berger, Linz (AT); and Stefan Ortner, Linz (AT)
Assigned to BOREALIS AG, Vienna (AT)
Filed by BOREALIS AG, Vienna (AT)
Filed on May 24, 2022, as Appl. No. 17/752,243.
Application 17/752,243 is a division of application No. 16/631,498, abandoned, previously published as PCT/EP2018/074543, filed on Sep. 12, 2018.
Claims priority of application No. 17192035 (EP), filed on Sep. 20, 2017.
Prior Publication US 2022/0282077 A1, Sep. 8, 2022
Int. Cl. C08L 23/14 (2006.01); B29C 39/00 (2006.01); B29C 49/00 (2006.01); C08L 23/08 (2006.01); C08L 23/16 (2006.01); C08L 23/18 (2006.01); B29K 23/00 (2006.01)

CPC C08L 23/14 (2013.01) [B29C 39/003 (2013.01); B29C 49/0005 (2013.01); C08L 23/08 (2013.01); C08L 23/16 (2013.01); C08L 23/18 (2013.01); B29K 2023/14 (2013.01); B29K 2023/16 (2013.01); C08L 2201/10 (2013.01); C08L 2203/162 (2013.01); C08L 2205/025 (2013.01); C08L 2314/02 (2013.01)]

7 Claims

1. An unoriented film, wherein the unoriented film is a cast film or a blown film, wherein the unoriented film comprises more than 90% of a polypropylene composition, the polypropylene composition comprising

(A) a blend of

(a) 80.0 to 92.0 wt %, based on the blend, of a propylene terpolymer comprising

(i) ethylene-derived comonomer units in an amount of from 1.0 to 1.6 wt %, and

(ii) comonomer units derived from a C₄to C₁₀α-olefin in an amount of from 6.0 to 10.0 wt %,

whereby the terpolymer has an MFR₂(230° C., 2.16 kg, ISO 1133) in a range of 1.5 to 5.0 g/10 min and

(b) 8.0 to 20.0 wt %, based on the blend, of an ethylene based plastomer having a density according to ISO 1183 of from 0.850 g/cm³to 0.900 g/cm³and an MFR₂according to ISO 1133 (190° C.; 2.16 kg) in the range of 0.3 to 4.0 g/10 min, and

(B) optionally one or more additives in a total amount of from 0.0 up to 5.0 wt %, based on the polypropylene composition, selected from the group consisting of slip agents, anti-block agents, UV stabilizers, alpha and/or beta nucleating agents, antistatic agents, and antioxidants,

wherein the MFR₂according to ISO 1133 (230° C.; 2.16 kg) of the polypropylene composition is in the range of 1.7 to 4.0 g/10 min,

wherein the unoriented film has a Dart Drop Impact according to ASTM D1709, method A of 500 g to 1500 g, a haze according to ASTM D1003-00 determined on 50 μm blown film of 20.0% to 25.0%, a tensile modulus in machine direction according to ISO 527-3 on blown film with a thickness of 50 μm at a cross head speed of 100 mm/min of 300 to 558 MPa, and a sealing initiation temperature in the range of 100° C. to 108° C.