Low density ethylene-based polymer compositions with high melt strength and mid-high density control

Patent metadata

Field	Value
Publication number	US-2018346697-A1
Application number	US-201715820083-A
Country	US
Kind code	A1
Filing date	Nov 21, 2017
Priority date	May 22, 2013
Publication date	Dec 6, 2018
Grant date	—

Abstract

The invention provides a composition comprising a first ethylene-based polymer, formed by a high pressure, free-radical polymerization process, and a second ethylene-based polymer, formed by a high pressure, free-radical polymerization process, such composition comprising the following properties:
a) a melt index (I2) from 2.0 to 10 dg/min; b) a density from 0.922 to 0.935 g/cc; and wherein the second ethylene-based polymer is present in an amount from 60 to 95 weight percent, based on the sum of the weight of the first polymer and the second polymer; and wherein the second ethylene-based polymer has a density greater than, or equal to, 0.924 g/cc; and wherein the first ethylene-based polymer has a melt index less than 2.5 dg/min.

First claim

1 - 14 . (canceled)

15 . A composition comprising a first ethylene-based polymer, formed by a high pressure, free-radical polymerization process, and a second ethylene-based polymer, formed by a high pressure, free-radical polymerization process, such composition comprising the following properties:
a) a melt index (12) from 2.0 to 10 dg/min; b) a density from 0.922 to 0.935 g/cc; and wherein the second ethylene-based polymer is present in an amount from 60 to 95 weight percent, based on the sum of the weight of the first ethylene-based polymer and the second ethylene-based polymer; and wherein the second ethylene-based polymer has a density greater than, or equal to, 0.924 g/cc; and wherein the first ethylene-based polymer has a melt index less than 2.5 dg/min; and wherein the first ethylene-based polymer is formed in a tubular reactor comprising at least three reaction zones.

16 . The composition of claim 15 , wherein the first ethylene-based polymer has a melt index less than 2.0 dg/min.

17 . The composition of claim 15 , wherein the second ethylene-based polymer is present in an amount from 70 to 92 weight percent, based on the sum of the weight of the first polymer and the second polymer.

18 . The composition of claim 15 , wherein the first ethylene-based polymer has a Melt Strength greater than, or equal to, 15 cN.

19 . The composition of claim 15 , wherein the second ethylene-based polymer has a melt index from 2.0 to 50 dg/min.

20 . The composition of claim 15 , wherein the second ethylene-based polymer has a melt index from 3.0 to 30 dg/min.

21 . The composition of claim 15 , wherein the composition has a hexane extractable content less than 5.5 wt %.

22 . The composition of claim 15 , wherein the composition has a hexane extractable content less than 2.6 wt %.

23 . The composition of claim 15 , wherein the first ethylene-based polymer and the second ethylene-based polymer each independently has a hexane extractable content less than, or equal to, 2.6 wt %.

24 . The composition of claim 15 , wherein each polymer component of the composition independently has a hexane extractable content less than, or equal to, 2.6 wt %.

25 . The composition of claim 15 , wherein the composition has a melt index (I2) from 2.5 to 10 dg/min.

26 . The composition of claim 15 , wherein the composition has a density from 0.922 to 0.932 g/cc.

27 . An article comprising at least one component formed from the composition of claim 15 .

28 . The article of claim 27 , wherein the article is a coating, a film, a foam, a laminate, a fiber, or a tape.

29 . A method for forming the composition of claim 15 , said method comprising mixing the first ethylene-based polymer and the second ethylene-based polymer.

30 . A method for forming the composition of claim 15 , said method comprising separately feeding the first ethylene-based polymer and the second ethylene-based polymer into an extrusion system.

Assignees

• Dow Global Technologies Llc

Inventors

• Den Doelder Cornelis F J
• Zuercher Karl
• Berbee Otto J
• Wang Jian
• Karjala Teresa P

Classifications

• C08L2203/16

  used for films · CPC title

• C09D123/06

  Polyethylene · CPC title

• C08L2207/066

  LDPE (radical process) · CPC title

• C08J2323/06

  Polyethene · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title