Polyolefin compositions and uses thereof

Patent metadata

Field	Value
Publication number	US-9765164-B2
Application number	US-201414316877-A
Country	US
Kind code	B2
Filing date	Jun 27, 2014
Priority date	Jun 27, 2014
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A linear low density polyethylene composition suitable for injection molding applications comprising less than or equal to 100 percent by weight of the units derived from ethylene, less than 35 percent by weight of units derived from one or more α-olefin comonomers, and characterized by its density, molecular weight distribution (M w /M n ), a melt index (I 2 ), a molecular weight distribution (M z /M w ), vinyl unsaturation, and zero shear viscosity ratio (ZSVR). The linear low density polyethylene composition exhibits low hexane extractable levels.

First claim

We claim:

1. An injection molded article comprising a linear low density polyethylene composition comprising:
less than or equal to 100 percent by weight of the units derived from ethylene;
less than 35 percent by weight of units derived from one or more α-olefin comonomers;
wherein said linear low density polyethylene composition has a density in the range of 0.912 to 0.925 g/cm 3 , a molecular weight distribution (M w /M n ) in the range of 2.5 to 4.5, a melt index (I 2 ) in the range of 15 to 30 g/10 minutes, a molecular weight distribution (M z /M w ) in the range of from 1.9 to 3, vinyl unsaturation of less than 0.1 vinyls per one thousand carbon atoms present in the backbone of said composition, and a zero shear viscosity ratio (ZSVR) in the range from 1 to 1.2.

2. The composition of claim 1 , wherein said linear low density polyethylene composition is characterized by having a density in the range of 0.915 to 0.922 g/cm 3 , and a melt index (I 2 ) in the range of 18 to 28 g/10 minutes.

3. The composition of claim 1 , wherein said linear low-density polyethylene composition has a hexane extractable in the range of from 0.5 to 2 weight percent, based on the weight of the linear low-density polyethylene composition.

4. The injection molded article claim 1 , wherein said injection molded article is a container device.

5. The injection molded article claim 1 , wherein said injection molded article is a closure device.

6. An article for storing items comprising a container and a lid adapted to be releasably secured to the container, wherein the container and lid are formed from a linear low density polyethylene composition comprising:
less than or equal to 100 percent by weight of the units derived from ethylene;
less than 35 percent by weight of units derived from one or more α-olefin comonomers;
wherein said linear low density polyethylene composition has a density in the range of 0.912 to 0.925 g/cm 3 , a molecular weight distribution (M w /M n ) in the range of 2.5 to 4.5, a melt index (I 2 ) in the range of 15 to 30 g/10 minutes, a molecular weight distribution (M z /M w ) in the range of from 1.9 to 3, vinyl unsaturation of less than 0.1 vinyls per one thousand carbon atoms present in the backbone of said composition, and a zero shear viscosity ratio (ZSVR) in the range from 1 to 1.2.

Assignees

• Dow Global Technologies Llc

Inventors

• Kababik David W
• Pletcher Kathleen E
• Wang Jian
• Brodil Jason C
• Tambling Troy M
• Reib Robert N
• Kapur Mridula

Classifications

• B65D2543/00296

  Plastic · CPC title

• C08F2500/19

  Shear ratio or shear ratio index · CPC title

• C08F4/65925

  two cyclopentadienyl rings being mutually non-bridged · 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