US 12,330,399 B2
Multilayer films comprising polyethylene and barrier layers and methods of producing the same
Georgia Natacha Eftalie Bitinis, Tarragona (ES); Albert Carbonell, Tarragona (ES); Peter Hermann Roland Sandkuehler, Horgen (CH); Sanjib Biswas, Lake Jackson, TX (US); Mehmet Demirors, Pearland, TX (US); Joshua B. Gaubert, Lake Jackson, TX (US); Mridula Kapur, Lake Jackson, TX (US); and Didem Oner-Deliormanli, Freeport, TX (US)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 17/632,706
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Aug. 4, 2020, PCT No. PCT/US2020/044864
§ 371(c)(1), (2) Date Feb. 3, 2022,
PCT Pub. No. WO2021/026141, PCT Pub. Date Feb. 11, 2021.
Claims priority of provisional application 62/883,497, filed on Aug. 6, 2019.
Claims priority of provisional application 62/883,467, filed on Aug. 6, 2019.
Claims priority of application No. 19382903 (EP), filed on Oct. 15, 2019.
Prior Publication US 2022/0305763 A1, Sep. 29, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. B32B 27/08 (2006.01); B32B 27/30 (2006.01); B32B 27/32 (2006.01)
CPC B32B 27/08 (2013.01) [B32B 27/306 (2013.01); B32B 27/32 (2013.01); B32B 2250/05 (2013.01); B32B 2250/246 (2013.01); B32B 2250/42 (2013.01); B32B 2270/00 (2013.01); B32B 2307/30 (2013.01); B32B 2307/558 (2013.01); B32B 2307/581 (2013.01); B32B 2439/70 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A multilayer film comprising:
a first layer comprising polyethylene;
a second layer comprising a first medium density polyethylene;
a barrier layer, wherein the second layer is positioned between the first layer and the barrier layer;
a third layer comprising a second medium density polyethylene, wherein the barrier layer is positioned between the second layer and the third layer; and
a fourth layer comprising polyethylene, wherein the third layer is positioned between the barrier layer and the fourth layer;
wherein the first medium density polyethylene and the second medium density polyethylene each comprise:
(a) a first polyethylene fraction having a single peak in a temperature range of 45° C. to 87° C. in an elution profile via improved comonomer composition distribution (iCCD) analysis method, wherein a first polyethylene fraction area is an area in the elution profile beneath the single peak of the first polyethylene fraction between 45° C. and 87° C.; and
(b) a second polyethylene fraction having a single peak in a temperature range of 95° ° C. to 120° C. in the elution profile via iCCD analysis method and wherein a second polyethylene fraction area is an area in the elution profile beneath the single peak of the second polyethylene fraction between 95° C. and 120° C.;
wherein the first medium density polyethylene and the second medium density polyethylene each have a density of 0.924 g/cm3 to 0.936 g/cm3 and a melt index (I2) of 0.25 g/10 minutes to 2.0 g/10 minutes, wherein the first polyethylene fraction area comprises at least 40% of the total area of the elution profile, wherein a ratio of the first polyethylene fraction area to the second polyethylene fraction area is 0.75 to 2.5, and wherein the width of the single peak of the second polyethylene fraction at 50 percent peak height is less than 5.0° C.