The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 13, 2001
Filed:
Apr. 18, 1996
Jacques Breulet, Wezembeek-Oppem, BE;
Benoît Koch, Hannut, BE;
Michel Promel, Brussels, BE;
Jiang Bian, Brussels, BE;
Olivier LHost, Mons, BE;
Solvay Polyolefins Europe-Belgium, Brussels, BE;
Abstract
Ethylene polymer having a die swell ratio (R,) of at least 1.4, a resistance to crazing under stress (ESCR) of at least 55 h and a melt index (MI,) 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 aluminum phosphates, used in a polymerization in a single or in two reactors.