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US 2023/0264404 A1Published application
Multilayer films and articles comprising the same
AssigneeDow Global Technologies LLC
InventorsGianna Buaszczyk, Bruno Cesar De Moraes Barbosa, Nicolas C. Mazzola, Rahul Sharma, Ronald Wevers
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Abstract
The present invention relates to multilayer films. In one aspect, a multilayer film comprises a first polyethylene composition having a density of at least 0.965 g/cm3 and as further described herein and a second polyethylene composition having a density of 0.924 g/cm3 to 0.936 g/cm3 and as further described herein, wherein the multilayer film comprises 40 weight percent or less of the first polyethylene composition based on the total weight of the multilayer film.
Claims7
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 (I2) 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 (I2) 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 (I2) 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.
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Dependencies are inferred from the claim text.