Invention Grant
- Patent Title: Polyethylene composition and film having high stiffness, outstanding sealability and high permeability
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Application No.: US16508385Application Date: 2019-07-11
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Publication No.: US11339278B2Publication Date: 2022-05-24
- Inventor: XiaoChuan Wang , Peter Zoricak , Brian Molloy , Qinyan Wang , Lawrence VanAsseldonk , Norman Aubee
- Applicant: NOVA Chemicals (International) S.A.
- Applicant Address: CH Fribourg
- Assignee: NOVA Chemicals (International) S.A.
- Current Assignee: NOVA Chemicals (International) S.A.
- Current Assignee Address: CH Fribourg
- Agent Thomas J. Styslinger
- Priority: CA3011050 20180711
- Main IPC: C08L23/08
- IPC: C08L23/08 ; C08L23/06

Abstract:
A polyethylene composition includes 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, and a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 70,000 to 250,000 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 10 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), a seal initiation temperature (SIT) of ≤90° C. (at a film thickness of about 2 mil), an area of hot tack window (AHTW) of ≥160 Newtons·C° (at a film thickness of about 2 mil) and an oxygen transmission rate (OTR) of ≥600 cm3 per 100 inch per day (at a film thickness of about 1 mil).
Public/Granted literature
- US20200017669A1 POLYETHYLENE COMPOSITION AND FILM HAVING HIGH STIFFNESS, OUTSTANDING SEALABILITY AND HIGH PERMEABILITY Public/Granted day:2020-01-16
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