US 12,263,628 B2
Multilayer films and articles comprising the same
Gianna Buaszczyk, Sao Paulo (BR); Bruno Cesar De Moraes Barbosa, Sao Paulo (BR); Nicolas C. Mazzola, Pearland, TX (US); Rahul Sharma, Pearland, TX (US); and Ronald Wevers, Terneuzen (NL)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 18/041,106
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Oct. 4, 2021, PCT No. PCT/US2021/053346
§ 371(c)(1), (2) Date Feb. 9, 2023,
PCT Pub. No. WO2022/093488, PCT Pub. Date May 5, 2022.
Claims priority of provisional application 63/107,890, filed on Oct. 30, 2020.
Prior Publication US 2023/0264404 A1, Aug. 24, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. B29C 48/08 (2019.01); B29C 48/00 (2019.01); B32B 27/08 (2006.01); B32B 27/32 (2006.01); B29K 23/00 (2006.01); B29K 103/04 (2006.01)
CPC B29C 48/08 (2019.02) [B29C 48/022 (2019.02); B32B 27/08 (2013.01); B32B 27/32 (2013.01); B29K 2023/0625 (2013.01); B29K 2023/0633 (2013.01); B29K 2103/04 (2013.01); B32B 2250/246 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A multilayer film comprising:
(a) a first polyethylene composition that comprises:
(1) from 25 to 37 percent by weight of a first polyethylene fraction having a density in the range of 0.935 to 0.947 g/cm3 and a melt index (12) of less than 0.1 g/10 minutes; and
(2) from 63 to 75 percent by weight of a second polyethylene fraction; and
wherein the first polyethylene composition has less than 0.10 branches per 1,000 carbon atoms when measured using 13C NMR, wherein the density of the first polyethylene composition is at least 0.965 g/cm3, and wherein the melt index (12) of the first polyethylene composition is 0.5 to 10 g/10 minutes; and
(b) a second polyethylene composition that comprises:
(1) 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 area fraction is an area in the elution profile beneath the single peak of the first polyethylene fraction between 45 and 87° C.; and
(2) 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 area fraction is an area in the elution profile beneath the single peak of the second polyethylene fraction between 95° C. and 120° C.;
wherein the second polyethylene composition has a density of 0.924 g/cm3 to 0.936 g/cm3 and a melt index (12) of 0.25 g/10 minutes to 2.0 g/10 minutes, wherein the second 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.;
wherein the multilayer film comprises 40 weight percent or less of the first polyethylene composition based on the total weight of the multilayer film.