Polyolefin compositions having improved optical and mechanical properties

US8288481B2 · kind B2 · utility

Assignee

• Borealis Technology Oy · FI

Inventors

• Joachim Fiebig · Felberleiten, AT
• Markus Gahleitner · Ansfelden, AT
• Pirjo Jaaskelainen · Porvoo, FI
• Bo Malm · Espoo, FI
• Tonja Schedenig · Ansfelden, AT

Key dates

• Filing date: Aug 26, 2008
• Grant date: Oct 16, 2012
• Expiry date: Sep 20, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/139
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Novel polyolefin compositions comprising (A) a first propylene-ethylene random copolymer and (B) a second propylene-ethylene random copolymer, wherein the polyolefin composition has an ethylene content CMAB of 1-10 wt % and an MFR(AB) of 3-20 g/10 min with the proviso that CMAB>CMA and MFR(A)/MFR(AB)>1.45 and where the polyolefin composition further has a randomness R of the ethylene distribution in the polymer chain of ≧0.945. Articles made from the novel polyolefin compositions have excellent optical properties even after subjecting them to a heat sterilization step.