公开(公告)号：US20090099316A1

公开(公告)日：2009-04-16

申请号：US12315552

申请日：2008-12-04

申请人： Venki Chandrashekar ,  Mark P. Mack ,  Charles H. Gates, JR. ,  Charles S. Holland ,  Natalia Nagy ,  Sandor M. Nagy ,  Edward S. Vargas ,  Jean A. Merrick-Mack

发明人： Venki Chandrashekar ,  Mark P. Mack ,  Charles H. Gates, JR. ,  Charles S. Holland ,  Natalia Nagy ,  Sandor M. Nagy ,  Edward S. Vargas ,  Jean A. Merrick-Mack

IPC分类号： C08L23/06

CPC分类号： C08L23/04 ,  C08F4/65912 ,  C08F4/65916 ,  C08F4/65925 ,  C08F4/65927 ,  C08F10/02 ,  C08F110/02 ,  C08F210/16 ,  C08L23/06 ,  C08L23/0807 ,  C08F2/001 ,  C08F4/65904 ,  C08L23/00 ,  C08L2666/06 ,  C08F2500/05 ,  C08F2500/09 ,  C08F210/08

摘要： 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 C3-C10 α-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.