POLYETHYLENE COMPOSITION AND FILM HAVING RETAINED DART IMPACT

WIPO Patent Application WO/2020/012313

A3

A polyethylene composition comprises a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution Mw/Mn of < 2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of less than 75,000 and a molecular weight distribution Mw/Mn of < 2.3, and a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 100,000 to 300,000 and a molecular weight distribution Mw/Mn of > 2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene. The polyethylene composition has a soluble fraction in a CEF analysis of at least 15 weight percent. Film made from the polyethylene composition may have a machine direction 1% secant modulus of ≥ 200 MPa (at a film thickness of about 1 mil) and an oxygen transmission rate (OTR) of ≥ 700 cm3 per 100 inch2 (at a film thickness of about 1 mil). Film made from the polyethylene composition retains much of its dart impact performance on downgauging from a thickness of 1 mil to a thickness of 0.75 mil.

WANG XIAOCHUAN (CA)
ZORICAK PETER (CA)
MOLLOY BRIAN (CA)
WANG QINYAN (CA)
VANASSELDONK LAWRENCE (CA)
AUBEE NORMAN (CA)

PCT/IB2019/055770

April 09, 2020

July 06, 2019

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NOVA CHEM INT SA (CH)

C08F210/16; C08J5/18; C08L23/06

WO2016063200A1	2016-04-28
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WO2017106120A2	2017-06-22
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WO1994026816A1	1994-11-24
WO2014099307A1	2014-06-26

US9963529B1	2018-05-08
US20170158789A1	2017-06-08
US20080038533A1	2008-02-14

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