Charles Anthony Gates

US Patent:

20070055021, Mar 8, 2007

Filed:

Sep 2, 2005

Appl. No.:

11/218888

Inventors:

Venki Chandrashekar - Houston TX, US
Mark Mack - West Chester OH, US
Charles Gates - Lake Jackson TX, US
Charles Holland - Coal City IL, US
Natalia Nagy - Naperville IL, US
Sandor Nagy - Naperville IL, US
Edward Vargas - Loveland OH, US

International Classification:

C08L 23/04

US Classification:

525240000

Abstract:

Disclosed is a polyethylene composition. The composition comprises single-site multimodal resin A and single-site multimodal resin B, wherein resin A differs from resin B in molecular weight, in monomeric composition, in density, in long chain branch concentration or distribution, or in combinations thereof. Disclosed is also a method for making the polyethylene composition. The method comprises polymerizing, in the presence of two or more single-site catalysts, ethylene or its mixture with a C-Cα-olefin to form a first multimodal resin and continuing the polymerization in the presence of the same catalysts but in a different hydrogen concentration, in a different monomer composition, or at a different temperature to form a second multimodal resin.