Ternary thermoplastic molding composition containing polypropylene copolymers

US4319005A · kind A · utility

Assignee

• Dynamit Nobel GmbH · DE

Inventors

• Paul Spielau · Troisdorf, DE
• Werner Kuhnel · Uttenreuth, DE
• Dietmar Welsch · Weißenburg, DE
• Gerd Klingberg · Lohmar, DE
• Hans E. Konermann · Troisdorf, DE
• Wilfried Leeder · Troisdorf, DE

Key dates

• Filing date: Mar 31, 1981
• Grant date: Mar 9, 1982
• Expiry date: Mar 31, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2205/03
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A ternary molding composition is formed of an admixture of ethylene-propylene copolymer, propylene polymer, and polyethylene and contains 30-45% by weight of a partially crystalline ethylene-propylene copolymer with an ethylene content of at least 65% by weight; a melt index MFI (230/5) of 0.7-2.0 g/10 min, and a tensile strength higher than 5.0 N/mm.sup.2 ; 35-65% by weight of propylene polymer with a melt index MFI (230/5) of 15-50 g/10 min, and 3-30% by weight of polyethylene with a melt index MFI (230/5) of 15-50 g/10 min, said molding composition having a melt index MFI (230/5) of at least 8 g/10 min and a tensile strength of at least 15 N/mm.sup.2 and an elongation at yield of at least 450%.