Polyethylenes with increased molecular weight distribution

Patent metadata

Field	Value
Publication number	US-9856339-B2
Application number	US-201414911665-A
Country	US
Kind code	B2
Filing date	Sep 2, 2014
Priority date	Sep 5, 2013
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

Methods for making olefin polymerization catalysts and methods for making polyethylene polymers using the catalysts are provided. The polyethylenes can have a molecular weight distribution (MWD) of about 4.5 to about 14, a slope of strain hardening greater than about 0.75, and a melt flow ratio (MFR) greater than or equal to 8.33+(4.17×MWD).

First claim

What is claimed is:

1. A polyethylene comprising:
a molecular weight distribution (MWD) of about 4.5 to about 14;
a slope of strain hardening greater than about 0.75, as measured by extensional viscosity fixture (EVF); and
wherein the polyethylene has a heterogeneous distribution of short chain branching (SCB) and a melt flow ratio (I 21 /I 2 ) greater than or equal to 8.33+(4.17×MWD).

2. The polyethylene of claim 1 , wherein the polyethylene has a MWD of about 6.8 to about 14.

3. The polyethylene of claim 1 , wherein the polyethylene has a MWD of about 6.9 to about 14.

4. The polyethylene of claim 1 , wherein the polyethylene has a MWD of about 7.0 to about 14.

5. The polyethylene of claim 1 , wherein the polyethylene has a long chain branching (LCB) greater than about 0.01 per 1,000 carbon atoms and less than about 0.07 per 1,000 carbon atoms.

6. The polyethylene of claim 1 , wherein the polyethylene has a long chain branching (LCB) between about 0.05 and 0.06 per 1,000 carbon atoms.

7. The polyethylene of claim 1 , wherein the polyethylene has a long chain branching (LCB) having a length of 4 or more carbon atoms.

8. The polyethylene of claim 1 , wherein the polyethylene has a ratio of weight-average molecular weight calculated using an LS detector to weight-average molecular weight calculated using an RI detector, M w (LS)/M w (RI), of from about 1.4 to about 3.0.

9. The polyethylene of claim 1 , wherein the polyethylene has a ratio of weight-average molecular weight calculated using an LS detector to weight-average molecular weight calculated using an RI detector, M w (LS)/M w (RI), of from about 1.4 to about 2.8.

10. The polyethylene of claim 1 , wherein the polyethylene has a comonomer homogeneity index (CHI) of less than about 0.5.

11. The polyethylene of claim 1 , wherein the polyethylene has a melt flow ratio (I 21 /I 2 ) ranging from about 30 to about 60.

12. The polyethylene of claim 1 , wherein the polyethylene has a melt flow ratio (I 21 /I 2 ) ranging from about 45 to about 60.

13. The polyethylene of claim 1 , wherein the polyethylene has a density of from 0.91 g/cm 3 to about 0.965 g/cm 3 .

14. The polyethylene of claim 1 , wherein the polyethylene has a density greater than or equal to 0.945 g/cm 3 and a melt strength greater than or equal to a ×(3.7463×exp(−1.485×log(MI))), wherein a is equal to 1.5.

15. The polyethylene of claim 1 , wherein the polyethylene has a density greater than or equal to 0.945 g/cm 3 and a melt strength greater than or equal to a ×(3.7463×exp(−1.485×log(MI))), wherein a is equal to 1.75.

16. The polyethylene of claim 1 , wherein the polyethylene has a density greater than or equal to 0.945 g/cm 3 and a melt strength greater than or equal to a ×(3.7463×exp(−1.485×log(MI))), wherein a is equal to 1.9.

17. The polyethylene of claim 1 , wherein the polyethylene has a density less than or equal to 0.945 g/cm 3 and a melt strength greater than or equal to a ×(3.7463×exp(−1.485×log(M1))), wherein a is equal to 1.2.

18. The polyethylene of claim 1 , wherein the polyethylene has a density less than or equal to 0.945 g/cm 3 and a melt strength greater than or equal to a ×(3.7463×exp(−1.485×log(MI))), wherein a is equal to 1.5.

19. The polyethylene of claim 1 , wherein the polyethylene has a density less than or equal to 0.945 g/cm 3 and a melt strength greater than or equal to a ×(3.7463×exp(−1.485×log(MI))), wherein a is equal to 1.9.

20. The polyethylene of claim 1 , wherein the polyethylene is made using a catalyst that is free or essentially free from any electron donors or donor compounds.

Assignees

• Univation Tech Llc

Inventors

• Mariott Wesley R
• Cann Kevin J
• Moorhouse John H
• Goode Mark G
• Oswald Thomas

Classifications

• C08J2323/08

  Copolymers of ethene (C08J2323/16 takes precedence) · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• C08F210/16 Primary

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

• C08F4/6555

  and magnesium or compounds thereof · CPC title

• C08F2500/12

  Melt flow index or melt flow ratio · CPC title