Bimodal polyethylene film

US7897710B2 · kind B2 · utility

Assignee

• INEOS MANUFACTURING BELGIUM NV · BE

Inventors

• John Amos · Tervuren, BE
• Choon Kooi Chai · Overijse, BE
• Luc Dheur · Brussels, BE

Key dates

• Filing date: Aug 12, 2005
• Grant date: Mar 1, 2011
• Expiry date: Feb 25, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/24975
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Film formed from a polyethylene resin composition which obeys a dynamic rheological relationship at 190° C. between melt storage modulus G′, measured in Pa and at a dynamic frequency where the loss modulus G″=3000 Pa, and dynamic complex viscosity η*100, measured in Pa·s at 100 rad/s, such that (a) G′(G″=3000)>−0.86η*100+z where z=3800, and at the same time (b) G′(G″=3000)>0.875η*100−y where y=650, and having an impact strength (DDT) of at least 250 g, measured on 15 μm thick film (blown under conditions with BUR=5:1 and Neck Height=8×D) conditioned for 48 hours at 20°-25° C., according to ASTM D1709.