Polypropylene foam

US7799841B2 · kind B2 · utility

Assignee

• Borealis Technology Oy · FI

Inventors

• Manfred Stadlbauer · Linz, AT
• Eberhard Ernst · Linz, AT

Key dates

• Filing date: Feb 9, 2009
• Grant date: Sep 21, 2010
• Expiry date: Feb 9, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2323/12
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present technology relates to a foam comprising a polypropylene material. The polypropylene material is produced in the presence of a metallocene catalyst, and the foam and/or the polypropylene has a branching index g′ of less than 1.00 and a strain hardening index (SHI@1 s−1) of at least 0.30 measured by a deformation rate dε/dt of 1.00 s−1 at a temperature of 180° C., where the strain hardening index (SHI) is defined as the slope of the logarithm to the basis 10 of the tensile stress growth function (log(ηE+)) as a function of the logarithm to the basis 10 of the Hencky strain (log(ε)) in the range of Hencky strains between 1 and 3.