An ethylene (co)polymer of the present invention is a (co)polymer with excellent moldability and mechanical properties and either an ethylene homopolymer or a copolymer of ethylene and an α-olefin of 4 to 20 carbon atoms. The (co)polymer has methyl branches measured by
13
C-NMR less than 0.1 in number per 1,000 carbon atoms and Mw/Mn measured by GPC not lower than 1.8 and lower than 4.5. The (co)polymer is either an ethylene homopolymer or a copolymer of ethylene and an α-olefin of 3 to 20 carbon atoms. The melt tension (MT) and the swell ratio (SR) satisfy the relation; log(MT)>12.9−7.15×SR; and the intrinsic viscosity ([η]) and the melt flow rate (MFR) satisfy the relation; [η]>1.85×MFR
−0.192
in the case of MFR<1 and the relation; [η]>1.85×MFR
−0.213
in the case of MFR≧1. Such an ethylene (co)polymer can be usable for various molding applications and especially suitable for pipes.
本发明的
乙烯(共)聚合物是一种具有优异成型性和机械性能的(共)聚合物,可以是
乙烯均聚物或
乙烯和4至20个碳原子的α-烯烃的共聚物。所述(共)聚合物的13C-NMR测量的甲基支链数量不超过每1,000个碳原子0.1个,
GPC测量的Mw/Mn不低于1.8且低于4.5。所述(共)聚合物可以是
乙烯均聚物或
乙烯和3至20个碳原子的α-烯烃的共聚物。熔融张力(
MT)和膨胀比(SR)满足以下关系:log(
MT)>12.9-7.15×SR;本征粘度([η])和熔体流动速率(MFR)满足以下关系:当MFR<1时,[η]>1.85×MFR-0.192;当MFR≥1时,[η]>1.85×MFR-0.213。这种
乙烯(共)聚合物可以用于各种成型应用,特别适用于管道。