Monomodal copolymer of ethylene for injection molding and process for its preparation

US10626202B2 · kind B2 · utility

Assignee

• Basell Polyolefine GmbH · DE

Inventors

• Klaus Foettinger · Kelkheim, DE
• Manfred Hecker · Linz, DE
• Lothar Berger · Bonn, DE
• Rainer Karer · Kaiserslautern, DE
• Dieter Lilge · Schifferstadt, DE

Key dates

• Filing date: Jan 15, 2008
• Grant date: Apr 21, 2020
• Expiry date: Aug 28, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F210/16
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Monomodal copolymers of ethylene and molding compositions comprising such copolymers, wherein the copolymers have a density determined according to DIN EN ISO 1183-1, variant A in the range from 0.938 to 0.944 g/cm3, a melt index MFR21 determined according to ISO 1133 at 190° C. under a load of 21.6 kg in the range from 12 to 17 g/10 min, a weight average molar mass Mw in the range from 140 000 g/mol to 330 000 g/mol, a polydispersity Mw/Mn in the range from 9 to 17, and a content of comonomer side chains per 1000 carbon atoms Cx equal to or above a value defined via equation (I) Cx=128.7−134.62×d′, wherein d′ is the numerical value of the density of the copolymer in g/cm3, the use of the copolymers for producing injection-molded articles, as well as injection-molded articles comprising the copolymers, and process for the preparation of such monomodal copolymers.