Injection molding polymer

US6806338B2 · kind B2 · utility

Assignee

• Borealis Technology Oy · FI

Inventors

• Hege Vale Baann · Stathelle, NO
• Ann Kristin Lindahl · Stathelle, NO

Key dates

• Filing date: May 5, 2003
• Grant date: Oct 19, 2004
• Expiry date: May 5, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2314/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An LLDPE produced using a single site catalyst, e.g., an LLDPE produced using a metallocene (m-LLDPE), is preferably used in injection moulding of food packaging material, especially closures for food containers. Such materials have been found to exhibit low levels of migration, typically less than 40 mg/dm2, e.g., less than 5 mg/dm2, and are particularly suitable for use in packaging foods having a high fat content.