Toughened propylene polymers having little tendency to white fracture

US6815490B2 · kind B2 · utility

Assignee

• Basell Polyolefine GmbH · DE

Inventors

• Stefan Seelert · Bischofswerda, DE
• Klaus-Dieter Rumpler · Monsheim, DE

Key dates

• Filing date: Jan 28, 2003
• Grant date: Nov 9, 2004
• Expiry date: Jan 28, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2314/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Propylene polymers containa) from 50 to 95 parts by weight of a propylene homopolymer having a melt flow index of from 0.1 to 100 g/10 min., at 230° C. and under a weight of 2.16 kg, according to ISO standard 1133, and an isotacticity index of at least 98%,b) from 5 to 50 parts by weight of an ethylene copolymer containing from 4 to 40% by weight of polymerized C4-C20-alk-1-ene and having a density of from 0.865 to 0.920 g/cm3 andc) from 0 to 1.5 parts by weight of a nucleating agent, the sum of the parts by weight of the propylene homopolymer a) and of the ethylene copolymer b) always being 100 parts by weight.The propylene polymers are distinguished in particular by high rigidity and little tendency to white fracture.