公开(公告)号：US20030149180A1

公开(公告)日：2003-08-07

申请号：US10222273

申请日：2002-08-16

Applicant: Dow Global Technologies Inc.

Inventor： Jozef J. Van Dun ,  Patrick J. Schouterden ,  Kalyan Sehanobish ,  Peter F.M. van den Berghe ,  Noorallah Jivraj ,  Johan Vanvoorden ,  Ravi S. Dixit ,  Ruddy Nicasy ,  Frederik E.L. Gemoets

IPC: C08L023/00

CPC classification number: C08F10/02 ,  C08F4/65908 ,  C08F4/65916 ,  C08F10/00 ,  C08F110/02 ,  C08F210/16 ,  C08L23/06 ,  C08L23/08 ,  C08L23/0807 ,  C08L23/0815 ,  C08L2205/025 ,  C08L2308/00 ,  C08L2314/06 ,  C08F2/001 ,  C08F4/6592 ,  C08L2666/06 ,  C08L2666/04 ,  C08F210/14 ,  C08F2500/13 ,  C08F2500/02 ,  C08F2500/01 ,  C08F2500/07 ,  C08F2500/05 ,  C08F2500/12 ,  C08F2/00 ,  C08F2500/18 ,  C08F2500/24 ,  C08F210/08

Abstract: The invention relates to a polyethylene composition with a bimodal molecular weight distribution and articles made therefrom, such as high topload blow moldings and transmission and distribution pipes. The composition comprises a low-molecular-weight (LMW) ethylene homopolymer component and a homogeneous, high-molecular-weight (HMW) ethylene interpolymer component, wherein the LMW component is characterized as having a molecular weight distribution, MWDL, of less than about 8. The composition is characterized as having a bimodal molecular weight distribution, and a ductile-brittle transition temperature, Tdb, of less than null20null C. In some embodiments, the HMW component is characterized by a reverse comonomer distribution.

Abstract translation: 本发明涉及具有双峰分子量分布的聚乙烯组合物和由其制成的制品，例如高顶吹模塑制品和输配管。 组合物包含低分子量（LMW）乙烯均聚物组分和均相的高分子量（HMW）乙烯互聚物组分，其中LMW组分的特征在于分子量分布MWDL小于约 该组合物的特征在于具有小于-20℃的双峰分子量分布和延性 - 脆性转变温度Tdb。在一些实施方案中，HMW组分的特征在于反向共聚单体分布。