Polyethylene blow molding composition for producing small containers

US7427649B2 · kind B2 · utility

Assignee

• Basell Polyolefine GmbH · DE

Inventors

• Joachim Berthold · Prien am Chiemsee, DE
• Ludwig Bohm · Mainz, DE
• Peter Krumpel · Bad Camberg, DE
• Rainer Mantel · Worms, DE

Key dates

• Filing date: Dec 6, 2003
• Grant date: Sep 23, 2008
• Expiry date: Aug 7, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2205/03
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a polyethylene composition with multi-modal molecular mass distribution, which is particularly suitable for blow molding of small containers with a volume in the range of from 200 to 5000 cm3 (=ml). The composition has a density in the range of from 0.955 to 0.960 g/cm3 at 23° C. and an MFR190/5 in the range from 0.8 to 1.6 dg/min. It composition from 45 to 55% by weight of a low-molecular-mass ethylene homopolymer A, from 20 to 35% by weight of a high-molecular-mass copolymer B made from ethylene and from another 1-olefin having from 4 to 8 carbon atoms, and from 20 to 30% by weight of an ultrahigh-molecular-mass ethylene copolymer C.