Tube made of a heterophasic polypropylene composition

US10266671B2 · kind B2 · utility

Assignee

• Borealis AG · AT

Inventors

• Ann Watson · Diest, BE
• Bill Fajardo · Ridgewood, US
• Ted Gormanos · Marietta, US
• Markus Gahleitner · Ansfelden, AT
• Jingbo Wang · Linz, AT
• Hermann Braun · Eislingen/Fils, DE
• Fredrik Bergfors · Göteborg, SE

Key dates

• Filing date: Jul 7, 2016
• Grant date: Apr 23, 2019
• Expiry date: Jul 7, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/441
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a tube comprising a heterophasic polypropylene composition comprising a heterophasic polypropylene copolymer with an antioxidant comprising a sterically hindered phenol. The heterophasic polypropylene copolymer has the relative amount of crystal line polypropylene above 20 wt %. the relative amount of xylene cold solubles (XCS) fraction is at least 10 wt % and the relative content of isolated ethylene sequences (I(E)) of the XCS fulfills the equation: I(E)<78−1.97×C+0.015×(C)2 wherein C is the comonomer content [wt %] of the XCS fraction and wherein the I(E) content is defined by equation I(E) wherein I(E) is the relative content of isolated to block ethylene sequences.