Processing polyethylenes

US6620895B1 · kind B1 · utility

Assignee

• E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

• Patricia Metzger Cotts · Wilmington, US
• William H. Tuminello · Newark, US
• Lin Wang · Hockessin, US
• Joel David Citron · Wilmington, US

Key dates

• Filing date: Sep 28, 2000
• Grant date: Sep 16, 2003
• Expiry date: Nov 10, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/916
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Polyethylenes made from ethylene and a series of &agr;-olefins using a catalyst that copolymerizes ethylene and &agr;-olefins usually have excellent melt processing characteristics, especially in uses where high zero shear viscosity and low high shear viscosity are desirable. These polyethylenes are preferably made by forming the &agr;-olefins in situ from ethylene during the polymerization process. The polyethylenes are especially useful in blow molding, extrusion or extruded blown film processes.