Patent · US Expired

Process for producing ethylene/.alpha.-olefin copolymer

US6313240A · kind A · utility

19Cited by

5References

2Claims

0Family size

Assignee

TOSOH CORPORATION · CN

Inventors

Saiki Hasegawa · Somalomo, CM
Makoto Sone · Shimabara, JP
Hisami Yasuda · Shimabara, JP
Akihiro Yano · Tokyo, JP

Key dates

Filing date	Feb 18, 1994
Grant date	Nov 6, 2001
Priority date	—
Expiry date	Feb 18, 2014

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S526/943
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for producing an ethylene/.alpha.-olefin copolymer is provided in which ethylene is copolymerized with an .alpha.-olefin having three or more carbons by use of an olefin polymerization catalyst at a polymerization temperature of not lower than 120.degree. C. The olefin polymerization catalyst comprises, as constitutional components, a) a metallocene compound comprising hafnium, b) an ionizing ionic compound, and c) an organoaluminum compound, the ionizing ionic compound (b) being a compound which is capable of changing the metallocene compound (a) into a cationic form and does not further react the cationic form of the metallocene compound.

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