	US 11,718,719 B2
	Oriented films comprising ethlyene-based polymers and methods of making same
Etienne R. H. Lernoux, Longueville (BE); Giriprasath Gururajan, Missouri City, TX (US); Donald A. Winesett, Houston, TX (US); and Stefan B. Ohlsson, Keerbergen (BE)
Assigned to ExxonMobil Chemical Patents Inc., Baytown, TX (US)
Appl. No. 16/341,549
Filed by ExxonMobil Chemical Patents Inc., Baytown, TX (US)
PCT Filed Oct. 4, 2017, PCT No. PCT/US2017/055142 § 371(c)(1), (2) Date Apr. 12, 2019, PCT Pub. No. WO2018/071250, PCT Pub. Date Apr. 19, 2018.
Claims priority of provisional application 62/408,282, filed on Oct. 14, 2016.
Claims priority of application No. 16206928 (EP), filed on Dec. 27, 2016.
Prior Publication US 2020/0369841 A1, Nov. 26, 2020
Int. Cl. C08J 5/18 (2006.01); B29C 48/00 (2019.01); C08L 23/06 (2006.01)

CPC C08J 5/18 (2013.01) [B29C 48/0018 (2019.02); C08L 23/06 (2013.01); B29C 2948/92152 (2019.02); B29C 2948/92266 (2019.02); B29K 2995/005 (2013.01); B29K 2995/0089 (2013.01); C08J 2323/06 (2013.01); C08L 2207/066 (2013.01)]

24 Claims

1. A machine direction oriented (MDO) polymer film obtained by:

stretching a polymer film having a gauge of from 11 to 120 μm and comprising at least one layer comprising 50 to 100 wt. % of an ethylene-based polymer having:

i. a melt index (I_2.16) of from about 0.1 g/10 min to about 10.0 g/10 min;

ii. a melt index ratio (I_21.6/I_2.16) of from about 15 to about 45;

iii. a weight average molecular weight (M_w) of from about 20,000 to about 200,000;

iv. a molecular weight distribution (M_w/M_n) of from about 2.0 to about 5.0;

v. a M_z/M_wratio of from 1.7 to about 3.5; and

vi. a density of from 0.900 to 0.925 g/cm³,

wherein:

stretching is performed at a temperature less than the melting point of the polymer to a MDO draw ratio of from 11 to 6.0 sufficient to produce the MDO polymer film; and

the MDO polymer film has a gauge from 10 to 20 μm and a normalized MD Elmendorf Tear of at least 40 g/μm.