Polyethylene compositions and articles made therefrom

Patent metadata

Field	Value
Publication number	US-10927203-B2
Application number	US-201816152470-A
Country	US
Kind code	B2
Filing date	Oct 5, 2018
Priority date	Nov 13, 2017
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

Polyethylene compositions including at least 65 wt % ethylene derived units and from 0 to 35 wt % of C3-C12 olefin comonomer derived units, based upon the total weight of the polyethylene composition are provided. The polyethylene compositions have a) an RCI,m of 100 kg/mol or greater and one or both of: b) a Tw1-Tw2 value of from −16 to −38° C.; and c) an Mw1/Mw2 value of at least 0.9. The polyethylene compositions may be used to manufacture articles such as films.

First claim

What is claimed is:

1. A polyethylene composition comprising at least 65 wt % ethylene derived units and from 0 to 35 wt % of C3-C12 olefin comonomer derived units, based upon the total weight of the polyethylene composition; wherein the polyethylene composition has:
a) an RCI,m of 150 kg/mol or greater;
and one or both of:
b) a Tw 1 -Tw 2 value of from −16 to −38° C.; and
c) an Mw 1 /Mw 2 value of at least 0.9;
and one or more of the following:
d) a density of from 0.890 g/cm 3 to 0.940 g/cm 3 ;
e) a melt index (MI) of from 0.1 g/10 min to 30 g/10 min;
f) a melt index ratio (121/12) of from 10 to 90;
g) an M w /M n of from 2 to 16;
h) an M z /M w of from 2.5 to 5.0;
i) an M z /M n of from 10 to 50; and
j) a g′(vis) of 0.90 or greater;
and further wherein the internal unsaturation of the polyethylene composition as measured by 1 H NMR is more than 0.2 total internal unsaturations per thousand carbon atoms.

2. The polyethylene composition of claim 1 , wherein the C 3 -C 12 olefin comonomer derived units are C 4 -C 8 α-olefin comonomer derived units.

3. The polyethylene composition of claim 1 , wherein the polyethylene composition comprises from 0.5 to 20 wt % of the C 3 -C 12 olefin comonomer derived units, based upon the total weight of the polyethylene composition.

4. The polyethylene composition of claim 1 , wherein the polyethylene composition comprises from 1 to 10 wt % of C 4 -C 8 α-olefin comonomer derived units, based upon the total weight of the polyethylene composition.

5. The polyethylene composition of claim 1 , wherein the polyethylene composition has a Tw 1 -Tw 2 value of from −23 to −36° C.

6. The polyethylene composition of claim 1 , wherein the polyethylene composition has a Tw 1 -Tw 2 value of from −23 to −33° C.

7. The polyethylene composition of claim 1 , wherein the polyethylene composition has an Mw 1 /Mw 2 value of from 0.9 to 4.

8. The polyethylene composition of claim 1 , wherein the polyethylene composition has an Mw 1 /Mw 2 value of from 1.25 to 4.

9. The polyethylene composition of claim 1 , wherein the polyethylene composition has a melt index (MI) of from 0.1 g/10 min to 6 g/10 min.

10. The polyethylene composition of claim 1 , wherein the polyethylene composition has a melt index ratio (I 21 /I 2 ) of from 20 to 45.

11. The polyethylene composition of claim 1 , wherein the polyethylene composition has a high load melt index (I 21 ) of from 5 to 60 g/10 min.

12. The polyethylene composition of claim 1 , wherein the polyethylene composition has an M w /M n of from 5 to 10.5.

13. The polyethylene composition of claim 1 , wherein the polyethylene composition has a g′(vis) of 0.940 or greater.

14. The polyethylene composition of claim 1 , wherein the polyethylene composition has a density of from 0.900 g/cm 3 to 0.930 g/cm 3 .

15. The polyethylene composition of claim 1 , wherein the polyethylene composition has an RCI,m of 200 kg/mol or greater.

16. The polyethylene composition of claim 1 , having all of the properties (d)-(j).

17. An article made from the polyethylene composition of claim 1 , wherein the article is optionally a blown film or cast film.

18. A film made from the polyethylene composition of claim 1 , wherein the film has an average MD/TD modulus 1.2*X or more, where X=(2,065,292*density of polyethylene composition)−1,872,345.

19. The article of claim 17 , wherein the film exhibits an average MD/TD modulus of between 30,000 psi and 40,000 psi.

20. The article of claim 17 , wherein the film has a dart drop impact resistance of 600 g/mil or greater.

21. The article of claim 17 , wherein the film has a dart drop impact resistance of 700 g/mil or greater.

22. The article of claim 17 , wherein the film has an Elmendorf tear resistance of 300 g/mil or greater in the machine direction (MD).

23. The article of claim 17 , wherein the film has an Elmendorf tear resistance of 350 g/mil or greater in the machine direction (MD).

24. The article of claim 17 , wherein the film has a haze of 12% or less.

25. The article of claim 17 , wherein the polymer composition has an MIR of 35 to 55 and wherein the film has an Elmendorf tear resistance of 300 g/mil or more in the machine direction (MD), and/or a dart drop impact resistance of at least 500 g/mil or more.

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Lue Ching-Tai
• Silva Adriana S
• Holtcamp Matthew W
• Sanders David F
• Impelman Ryan W
• Pequeno Richard E
• Harlan Charles J
• Ye Xuan
• Li Dongming
• Hule Rohan A
• Bedoya Matthew S

Classifications

• C08J2323/04

  Homopolymers or copolymers of ethene · CPC title

• C08F4/65916

  supported on a carrier, e.g. silica, MgCl2, polymer · CPC title

• C08F4/65912

  in combination with an organoaluminium compound · CPC title

• C08F2500/08

  Low density, i.e. < 0.91 g/cm3 · CPC title

• C08F2500/12

  Melt flow index or melt flow ratio · CPC title