Bimodal ethylene-based polymers having high molecular weight high density fractions

Patent metadata

Field	Value
Publication number	US-11873393-B2
Application number	US-201916973639-A
Country	US
Kind code	B2
Filing date	Jun 13, 2019
Priority date	Jun 15, 2018
Publication date	Jan 16, 2024
Grant date	Jan 16, 2024

Abstract

A bimodal ethylene-based polymer, including a high density fraction (HDF) from 3.0% to 25.0%, wherein the high density fraction is measured by crystallization elution fractionation (CEF) integration at temperatures from 93° C. to 119° C., an I10/I2 ratio from 5.5 to 7.5, wherein I2 is the melt index when measured according to ASTM D 1238 at a load of 2.16 kg and temperature of 190° C. and I10 is the melt index when measured according to ASTM D 1238 at a load of 10 kg and temperature of 190° C., and a short chain branching distribution (SCBD) less than or equal to 10° C., wherein the short chain branching distribution is measured by CEF full width at half height.

First claim

The invention claimed is:

1. A bimodal ethylene-based polymer, comprising:
a high density fraction (HDF) from 3.0% to 25.0%, wherein the high density fraction is measured by crystallization elution fractionation (CEF) integration at temperatures from 93° C. to 119° C.;
an I 10 /I 2 ratio from 5.5 to 7.5, wherein I 2 is the melt index when measured according to ASTM D 1238 at a load of 2.16 kg and temperature of 190° C. and I 10 is the melt index when measured according to ASTM D 1238 at a load of 10 kg and temperature of 190° C.; and
a short chain branching distribution (SCBD) less than or equal to 10° C., wherein the short chain branching distribution is measured by CEF full width at half height.

2. The bimodal ethylene-based polymer of claim 1 , wherein the bimodal ethylene-based polymer has a density from 0.900 g/cc to 0.925 g/cc.

3. The bimodal ethylene-based polymer of claim 1 , wherein the bimodal ethylene-based polymer has a melt index (I 2 ) from 0.5 g/10 mins to 7.0 g/10 mins.

4. The bimodal ethylene-based polymer of claim 1 , wherein the bimodal ethylene-based polymer has a melt index (I 2 ) from 2.0 g/10 mins to 4.0 g/10 mins.

5. The bimodal ethylene-based polymer of claim 1 , wherein the bimodal ethylene-based polymer has an HDF from 3.0% to 7.5%.

6. The bimodal ethylene-based polymer of claim 1 , wherein the bimodal ethylene-based polymer has a I 10 /I 2 ratio from 5.5 to 6.0.

7. The bimodal ethylene-based polymer of claim 1 , wherein the bimodal ethylene-based polymer has an SCBD less than or equal to 9° C.

8. The bimodal ethylene-based polymer of claim 1 , wherein the bimodal ethylene-based polymer has an SCBD less than or equal to 7° C.

9. The bimodal ethylene-based polymer of claim 1 , wherein
the bimodal ethylene-based polymer comprises a first polymer fraction and a second polymer fraction having a density and melt index (I 2 ) different from that of the first polymer fraction, and
the bimodal ethylene-based polymer comprises from 70.0 wt. % to 92.0 wt. % of a first polymer fraction and 8.0 wt. % to 30 wt. % of a second polymer fraction.

10. The bimodal ethylene-based polymer of claim 9 , wherein the bimodal ethylene-based polymer has a density that is higher than a density of the first polymer fraction.

11. The bimodal ethylene-based polymer of claim 9 , wherein the bimodal ethylene-based polymer has a melt index (I 2 ) that is higher than a melt index (I 2 ) of the first polymer fraction.

12. The bimodal ethylene-based polymer of claim 9 , wherein
a first portion of the second polymer fraction is formed in a mixer and a second portion of the second polymer fraction is formed in a non-agitated reactor, and
the first portion of the second polymer fraction has a higher weight average molecular weight than the second portion of the second polymer fraction.

13. The bimodal ethylene-based polymer of claim 1 , wherein the bimodal ethylene based polymer has a zero shear viscosity ratio from
1.1 to 3.0.

14. The bimodal ethylene-based polymer of claim 1 , wherein a ratio of Mw to Mn is less than 2.800.

15. A film comprising the bimodal ethylene-based polymer of claim 1 .

16. A polymer composition comprising:
the bimodal ethylene-based polymer of claim 1 ; and

at least one polymer selected from the group consisting of low density polyethylene, ultra-low density polyethylene, linear low density polyethylene, high density polyethylene, a propylene-based polymer, and mixtures thereof.

17. The bimodal ethylene-based polymer of claim 2 , wherein the bimodal ethylene-based polymer has a melt index (I 2 ) from 0.5 g/10 mins to 7.0 g/10 mins.

18. The bimodal ethylene-based polymer of claim 2 , wherein the bimodal ethylene-based polymer has an HDF from 3.0% to 7.5%.

19. The bimodal ethylene-based polymer of claim 2 , wherein the bimodal ethylene-based polymer has a I 10 /I 2 ratio from 5.5 to 6.0.

20. The bimodal ethylene-based polymer of claim 2 , wherein the bimodal ethylene-based polymer has an SCBD less than or equal to 9° C.

Assignees

• Dow Global Technologies Llc

Inventors

• Hart Kyle E
• Demirors Mehmet
• Gambrel Timothy W
• Fontaine Philip P
• Jain Pradeep

Classifications

• C08L23/12 Primary

  Polypropene · CPC title

• C08F2/001

  Multistage polymerisation processes characterised by a change in reactor conditions without deactivating the intermediate polymer (C08F295/00, C08F297/00 take precedence) · CPC title

• C08F2/01

  characterised by special features of the polymerisation apparatus used · CPC title

• C08F210/14

  Monomers containing five or more carbon atoms · CPC title

• C08F210/16 Primary

  Copolymers of ethene with alpha-alkenes, e.g. EP rubbers · CPC title