Patent · US Expired

Ethylene polymer and processes for obtaining it

US6335411B1 · kind B1 · utility

1Cited by

6References

7Claims

0Family size

Assignee

Solvay Polyolefins Europe-Belgium (Societe Anonyme) · US

Inventors

Benoit Koch · Hannut, BE
Michel Promel · Brussels, BE
Jiang Bian · Brussels, BE

Key dates

Filing date	Apr 2, 1999
Grant date	Jan 1, 2002
Priority date	—
Expiry date	Apr 2, 2019

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F2410/04
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Ethylene polymer having a blow-up ratio (RB) of at least 1.4, a resistance to crazing under stress (ESCR) of at least 55 h and a melt index (MI5) of at least 0.2 g/10 min. Processes for obtaining this ethylene polymer using different catalytic systems, the first based on titanium and zirconium used in a polymerization in two reactors; the second consisting of a mixture of a titanium catalyst and a titanium and zirconium catalyst, used in a polymerization in two reactors; the third based on chromium on a support comprising at least two constituents chosen from silica, alumina and aluminium phosphates, used in a polymerization in a single or in two reactors.

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