Low density ethylene-based polymers with broad molecular weight distributions and low extractables

Patent metadata

Field	Value
Publication number	US-9683058-B2
Application number	US-201514972346-A
Country	US
Kind code	B2
Filing date	Dec 17, 2015
Priority date	Nov 23, 2011
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

The invention provides an ethylene-based polymer comprising the following properties:
a) a melt index (I2)≧2.0 dg/min; b) a Mw(abs) versus I2 relationship: Mw(abs)<A+B(I2), where A=2.40×10 5 g/mole, and B=−8.00×10 3 (g/mole)/(dg/min); and c) a G′ versus I2 relationship: G′≧C+D(I2), where C=127.5 Pa, and D=−1.25 Pa/(dg/min).

The invention also provides an ethylene-based polymer comprising the following properties:
a) a melt index (I2)≧2.0 dg/min; b) a G′ versus I2 relationship: G′≧C+D(I2), where C=127.5 Pa, and D=−1.25 Pa/(dg/min) c) a chloroform extractable (Clext) versus G′ relationship: Clext.≦E+FG′, where E=0.20 wt %, and F=0.060 wt %/Pa; and d) a “weight fraction (w) of molecular weight greater than 10 6 g/mole, based on the total weight of polymer, and as determined by GPC(abs),” that meets the following relationship: w<I+J(I2), where I=0.080, and J=−4.00×10 −3 min/dg.

First claim

The invention claimed is:

1. An ethylene-based polymer comprising the following properties:
a) a melt index (I2)≧2.0 dg/min;
b) a Mw(abs) versus I2 relationship: Mw(abs)<A+B(I2), where A=2.40×10 5 g/mole, and B=−8.00×10 3 (g/mole)/(dg/min); and
c) a G′(at G″=500 Pa, 170° C.) versus I2 relationship: G′≧C+D( 2 ), where C=127.5 Pa, and D=−1.25 Pa/(dg/min); and
wherein the ethylene-based polymer has a n-hexane extractable level≦3.7 wt %.

2. The ethylene-based polymer of claim 1 , wherein the ethylene-based polymer has a Mw(abs) versus I2 relationship: Mw(abs)≦A+B(I2), where A=2.30×10 5 g/mole, and B=−8.00×10 3 (g/mole)/(dg/min).

3. The ethylene-based polymer of claim 1 , wherein the ethylene-based polymer has a I2≧2.5 g/10 min.

4. The ethylene-based polymer of claim 1 , wherein the ethylene-based polymer has a I2≦30 g/10 min.

5. The ethylene-based polymer of claim 1 , wherein the ethylene-based polymer has a G′≧120 Pa.

6. The ethylene-based polymer of claim 1 , wherein the ethylene-based polymer is selected from a polyethylene homopolymer or an ethylene-based interpolymer.

7. A composition comprising the ethylene-based polymer of claim 1 .

8. The composition of claim 7 , wherein the composition comprises greater than, or equal to, 90 weight percent of the ethylene-based polymer.

9. The composition of claim 7 , wherein the composition comprises greater than, or equal to, 95 weight percent of the ethylene-based polymer.

10. An article comprising at least one component formed from the composition of claim 7 .

11. An ethylene-based polymer comprising the following properties:
a) a melt index (I2)≧2.0 dg/min;
b) a Mw(abs) versus I2 relationship: Mw(abs)<A+B(I2), where A=2.40×10 5 g/mole, and B=−8.00×10 3 (g/mole)/(dg/min); and
c) a G′ versus I2 relationship: G′(at G″=500 Pa, 170° C.)≧C+D(I2), where C=127.5 Pa, and D=−1.25 Pa/(dg/min); and
wherein the ethylene-based polymer further comprises a chloroform extractable (Clext) level≦7.8 wt %.

12. The ethylene-based polymer of claim 11 , wherein the ethylene-based polymer has a Mw(abs) versus I2 relationship: Mw(abs)<A+B(I2), where A=2.30×10 5 g/mole, and B=−8.00×10 3 (g/mole)/(dg/min).

13. The ethylene-based polymer of claim 11 , wherein the ethylene-based polymer has a I2≧2.5 g/10 min.

14. The ethylene-based polymer of claim 11 , wherein the ethylene-based polymer has a I2≦30 g/10 min.

15. The ethylene-based polymer of claim 11 , wherein the ethylene-based polymer has a G′≧120 Pa.

16. The ethylene-based polymer of claim 11 , wherein the ethylene-based polymer is selected from a polyethylene homopolymer or an ethylene-based interpolymer.

17. A composition comprising the ethylene-based polymer of claim 11 .

18. The composition of claim 17 , wherein the composition comprises greater than, or equal to, 90 weight percent of the ethylene-based polymer.

19. The composition of claim 17 , wherein the composition comprises greater than, or equal to, 95 weight percent of the ethylene-based polymer.

20. An article comprising at least one component formed from the composition of claim 17 .

Assignees

• Dow Global Technologies Llc

Inventors

• Berbee Otto J
• Den Doelder Cornelis F J
• Hinrichs Stefan
• Karjala Teresa P

Classifications

• C09D123/06 Primary

  Polyethylene · CPC title

• C09D123/0815

  Copolymers of ethene with aliphatic 1-olefins · CPC title

• C08F218/08

  Vinyl acetate · CPC title

• C08F110/02 Primary

  Ethene · CPC title

• C08F2/01

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