Patent · US Expired

Manufacture of polyethylenes

US6921795B2 · kind B2 · utility

30Cited by

7References

7Claims

0Family size

Assignee

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

Inventors

Lin Wang · Hockessin, US
Maria Spinu · Wilmington, US
Joel David Citron · Wilmington, US

Key dates

Filing date	Feb 6, 2003
Grant date	Jul 26, 2005
Priority date	—
Expiry date	Feb 6, 2023

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L2314/06
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Blends of two or more polyethylenes are made by reacting ethylene with an oligomerization catalyst that forms α-olefins, and two polymerization catalysts, one of which under the process conditions copolymerizes ethylene and α-olefins, and the other of which under process conditions does not readily copolymerize ethylene and α-olefins. The blends may have improved physical properties and/or processing characteristics.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.