Polyolefin composition

Patent metadata

Field	Value
Publication number	US-9631059-B2
Application number	US-201314653352-A
Country	US
Kind code	B2
Filing date	Dec 27, 2013
Priority date	Dec 27, 2012
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

The instant invention provides a polyolefin composition suitable for packaging applications, films, multilayer structures and packaging devices made therefrom. The polyolefin composition according to the present invention comprises: an ethylene/α-olefin interpolymer composition comprising (a) from 50 to 75 percent by weight of a first ethylene/α-olefin copolymer fraction having a density in the range of 0.894 to 0.908 g/cm 3 , a melt index (I 2 ) in the range of from 0.2 to 1 g/10 minutes, and (b) from 25 to 50 percent by weight of a second ethylene/α-olefin copolymer fraction, and wherein said ethylene/α-olefin interpolymer composition has a density in the range of 0.910 to 0.924 g/cm 3 , a melt index (I 2 ) in the range of from 0.5 to 2 g/10 minutes, a zero shear viscosity ratio (ZSVR) in the range of from 1.15 to 2.5, a molecular weight distribution, expressed as the ratio of the weight average molecular weight to number average molecular weight (M w /M n ) in the range of from 2.0 to 4.0, and tan delta at 0.1 radian/second and 190° C. in the range of from 6 to 43.

First claim

We claim:

1. A monolayer blown film comprising a polyolefin composition suitable for packaging applications which comprises:
an ethylene/α-olefin interpolymer composition comprising (a) from 50 to 75 percent by weight of a first ethylene/α-olefin copolymer fraction having a density in the range of 0.894 to 0.908 g/cm 3 , a melt index (I 2 ) in the range of from 0.2 to 1 g/10 minutes, and (b) from 25 to 50 percent by weight of a second ethylene/α-olefin copolymer fraction,
wherein said ethylene/α-olefin interpolymer composition has a density in the range of 0.910 to 0.924 g/cm 3 , a melt index (I 2 ) in the range of from 0.5 to 2 g/10 minutes, a zero shear viscosity ratio (ZSVR) in the range of from 1.15 to 2.5, a molecular weight distribution, expressed as the ratio of the weight average molecular weight to number average molecular weight (M w /M n ) in the range of from 2.0 to 4.0, and tan delta at 0.1 radian/second and 190° C. in the range of from 6 to 43, wherein said ethylene/α-olefin interpolymer composition has at least 2 peaks on elution profile via crystallization elution fractionation (CEF) procedure, wherein each peak comprises at least 25 weight percent of the total area of the elution profile, wherein the separation of the 2 peak positions are in the range of from 20 to 40° C., wherein a higher elution temperature peak is at an elution temperature greater than 90° C., and wherein a lower elution temperature peak is at an elution temperature in the range of from 50 to 80° C., and wherein the width of the higher elution temperature peak at 50 percent peak height is less than 4° C., and wherein the width of the higher elution temperature peak at 10 percent peak height is less than 9° C., and wherein the width of the lower elution temperature peak at 50 percent peak height is less than 8° C., and wherein the width of the lower elution temperature peak at 10 percent peak height is less than 25° C.

Assignees

• Dow Global Technologies Llc

Inventors

• Demirors Mehmet
• Kapur Mridula
• Jain Pradeep
• Fontaine Philip P
• Ginger Douglas S
• Gillespie David T
• Bilgen Mustafa

Classifications

• 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

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L23/0815

  with aliphatic 1-olefins containing one carbon-to-carbon double bond · CPC title

• C08L23/08

  Copolymers of ethene (C08L23/16 takes precedence) · CPC title

• C08L23/06

  Polyethylene · CPC title