PROCESS FOR THE (CO)POLYMERIZATION OF ETHYLENE,申请号KR20067011857-传众专利搜索

PROCESS FOR THE (CO)POLYMERIZATION OF ETHYLENE

申请公布号：KR20060132617(A)

申请号：KR20067011857

申请日期：2004.11.24

申请公布日期：2006.12.21

申请人：

BASELL POLYOLEFINE GMBH

发明人：BAITA PIETRO;COVEZZI MASSIMO;MEI GABRIELE;MORINI GIAMPIERO;PATER JOACHIM T. M.

分类号：C08F210/16;C08F10/00;C08F10/02;C08F210/02

主分类号：C08F210/16

摘要：A process for preparing a broad molecular weight polyethylene carried out in the presence of a catalyst system comprising (i) a solid catalyst component comprising Mg, Ti, halogen, and optionally an internal electron donor compound, and (ii) an Al-alkyl cocatalyst said process comprising at least two step of polymerization (a) and (b), in which, - in a first step (a) ethylene is polymerized in the presence of a molecular weight regulator in order to produce a ethylene (co)polymer, and in a further step (b), which is carried out in the presence of an external electron donor compound added to this polymerization step as a fresh reactant, ethylene is copolymerized with an alpha olefin of formula CH2=CHR, in which R is a C1-C20 hydrocarbon group, to produce an ethylene copolymer having a molecular weight higher than that of the copolymer produced in step (b).