Polyethylene compositions

Patent metadata

Field	Value
Publication number	US-12570841-B2
Application number	US-202017789424-A
Country	US
Kind code	B2
Filing date	Dec 21, 2020
Priority date	Dec 31, 2019
Publication date	Mar 10, 2026
Grant date	Mar 10, 2026

Abstract

Embodiments of a polyethylene composition are provided, which may include a first polyethylene fraction comprising at least one peak in a temperature range of from 35° C. to 70° C. in an elution profile via improved comonomer composition distribution (iCCD) analysis method, where a first polyethylene area fraction is an area in the elution profile from 35° C. to 70° C., and where the first polyethylene fraction area comprises from 25% to 65% of the total area of the elution profile; and a second polyethylene fraction comprising at least one peak in a temperature range of from 85° C. to 120° C. in the elution profile, where a second polyethylene area fraction is an area in the elution profile from 85° C. to 120° C., and where the second polyethylene fraction area comprises at least 20% of the total area of the elution profile.

First claim

The invention claimed is:

1 . A polyethylene composition comprising:
(a) a first polyethylene fraction comprising at least one peak in a temperature range of from 35° C. to 70° 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 from 35° C. to 70° C., and wherein the first polyethylene fraction area comprises from 25% to 65% of the total area of the elution profile; (b) a second polyethylene fraction comprising at least one peak in a temperature range of from 85° C. to 120° C. in the elution profile via iCCD analysis method, wherein a second polyethylene area fraction is an area in the elution profile from 85° C. to 120° C., and wherein the second polyethylene fraction area comprises at least 20% of the total area of the elution profile; and (c) a third polyethylene fraction in a temperature range of from 70° C. to 85° C. in the elution profile via iCCD analysis method, wherein the third polyethylene area fraction is an area in the elution profile from 70° C. to 85° C., and wherein the third polyethylene fraction area comprises less than 10% of the total area of the elution profile; and wherein the polyethylene composition has a density of 0.880 g/cm 3 to 0.910 g/cm 3 , a melt index (I 2 ) of 0.50 g/10 minutes to 6.0 g/10 minutes, and a zero shear viscosity ratio of the polyethylene composition less than 2.0.

2 . The polyethylene composition of claim 1 , further comprising a fourth polyethylene fraction comprising at least one peak in a temperature range of from 20° C. to 35° C. in an elution profile via improved comonomer composition distribution (iCCD) analysis method, wherein a fourth polyethylene area fraction is an area in the elution profile from 20° C. to 35° C., and wherein the fourth polyethylene fraction area comprises from 0% to 35% of the total area of the elution profile.

3 . The polyethylene composition of claim 1 , wherein the first polyethylene fraction area comprises from 30% to 55% of the total area of the elution profile.

4 . The polyethylene composition of claim 1 , wherein the second polyethylene fraction area comprises from 20% to 45% of the total area of the elution profile.

5 . The polyethylene composition of claim 1 , wherein the third polyethylene fraction area comprises from 4% to 10% of the total area of the elution profile.

6 . The polyethylene composition of claim 1 , wherein the polyethylene composition has a molecular weight distribution, expressed as the ratio of the weight average molecular weight to number average molecular weight (Mw/Mn) in the range of from 2.0 to 6.0.

7 . The polyethylene composition of claim 1 , wherein a ratio of the molecular weight of the first polyethylene fraction to the molecular weight of the total area of the elution profile is from 0.5 to 1.5.

8 . The polyethylene composition of claim 1 , wherein the polyethylene composition has a tan delta, measured at 0.1 radian/sec and 190° C., from 10 to 100.

9 . A multilayer film comprising,
at least one layer comprising a polyethylene composition comprising:
(a) a first polyethylene fraction comprising at least one peak in a temperature range of from 35° C. to 70° 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 from 35° C. to 70° C., and wherein the first polyethylene fraction area comprises from 25% to 65% of the total area of the elution profile;
(b) a second polyethylene fraction comprising at least one peak in a temperature range of from 85° C. to 120° C. in the elution profile via iCCD analysis method, wherein a second polyethylene area fraction is an area in the elution profile from 85° C. to 120° C., and wherein the second polyethylene fraction area comprises at least 20% of the total area of the elution profile; and
(c) a third polyethylene fraction in a temperature range of from 70° C. to 85° C. in the elution profile via iCCD analysis method, wherein the third polyethylene area fraction is an area in the elution profile from 70° C. to 85° C., and wherein the third polyethylene fraction area comprises less than 10% of the total area of the elution profile; and
wherein the polyethylene composition has a density of 0.880 g/cm 3 to 0.910 g/cm 3 , a melt index (I 2 ) of 0.50 g/10 minutes to 6.0 g/10 minutes, and a zero shear viscosity ratio of the polyethylene composition less than 2.0.

10 . The multilayer film of claim 9 , wherein the at least one layer comprising a polyethylene composition is a sealant layer.

11 . The multilayer film of claim 10 , further comprising a substrate layer.

12 . A method of producing an article comprising the steps of:
applying the polyethylene composition of claim 1 to at least one surface of a substrate layer, thereby forming an article comprising a sealant layer associated with the at least one surface of the substrate layer.

Assignees

• Dow Global Technologies Llc

Inventors

• Biswas Sanjib
• Sharma Rahul
• Degroot Jacquelyn A
• Spiekermann Erica
• Ginger Douglas S
• Wang Jian
• Demirors Mehmet
• Gillespie David T
• Do Hien Q
• Fontaine Philip P

Classifications

• C08J2323/06

  Polyethene · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• C08F210/02

  Ethene · CPC title

• Y02P20/582

  Recycling of unreacted starting or intermediate materials · CPC title

• B32B2307/746

  Slipping, anti-blocking, low friction · CPC title