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    • 6. 发明授权
    • Ethylene/alpha-olefin copolymer
    • 乙烯/α-烯烃共聚物
    • US5459217A
    • 1995-10-17
    • US345793
    • 1994-11-22
    • Akira TodoMamoru TakahashiSeiichi IkeyamaToshiyuki Tsutsui
    • Akira TodoMamoru TakahashiSeiichi IkeyamaToshiyuki Tsutsui
    • C08F210/16C08J5/18C08F10/02C08F210/02
    • C08J5/18C08F210/16C08J2323/08
    • The present invention provides an ethylene/.alpha.-olefin copolymer comprising constituent units (a) derived from ethylene and constituent units (b) derived from an .alpha.-olefin having 3 to 20 carbon atoms, the ethylene copolymer being characterized in that(A) the ethylene/.alpha.-olefin copolymer has a density (d) of 0.88 to 0.95 g/cm.sup.3 ;(B) the ethylene/.alpha.-olefin copolymer has a MFR of 0.01 to 200 g/10 min as measured at a temperature of 190.degree. C. and a load of 2.16 kg;(C) the temperature (Tm) at which the exothermic curve of the ethylene/.alpha.-olefin copolymer measured by a differential scanning calorimeter (DSC) shows the highest peak and the density (d) satisfy the relationTm 75.times.MFR; and(F) the melt tension (MT) at 190.degree. C. and MFR of the copolymer satisfy the relation,3.98.times.MFR.sup.-0.66 >MT>2.times.MFR.sup.-0.65.
    • 本发明提供一种乙烯/α-烯烃共聚物,其包含衍生自乙烯的构成单元(a)和衍生自具有3-20个碳原子的α-烯烃的构成单元(b),所述乙烯共聚物的特征在于(A) 乙烯/α-烯烃共聚物的密度(d)为0.88〜0.95g / cm3; (B)乙烯/α-烯烃共聚物在190℃的温度和2.16kg的负荷下测得的MFR为0.01至200g / 10min; (C)通过差示扫描量热计(DSC)测定的乙烯/α-烯烃共聚物的放热曲线的温度(Tm)显示最高峰,密度(d)满足Tm <400d-250的关系; (D)在室温下正癸烷可溶成分的量分数(W)满足关系式,在MFR≤10g/ 10分钟的情况下,W <80×exp(-100(d-0.88) )+0.1,在MFR≥10g/ 10min的情况下,W <80x(MFR-9)0.35×exp(-100(d-0.88))+ 0.1; (E)当熔融共聚物在190℃的剪切应力达到2.4×10 6达因/ cm 2时给出的剪切速率所限定的流动指数(FI)满足关系式,FI> 75xMFR; 和(F)190℃下的熔体张力(MT),共聚物的MFR满足关系式3.98xMFR-0.66> MT> 2xMFR-0.65。