Provided is an α-olefin polymer having an excellent balance between a molecular weight and a melting point, which is a polymer of one or more kinds of α-olefins having 20 to 40 carbon atoms, and which meets the following requirements (1) to (4): (1) the α-olefin polymer has a molecular weight distribution (Mw/Mn) determined from its weight average molecular weight (Mw) and number average molecular weight (Mn) in terms of polystyrene measured by a GPC method of 2 or less, and has an Mw of 5,000 or less; (2) measurement of a melting point (Tm) of the α-olefin polymer with DSC shows one melting peak, a melting heat absorption (AH) calculated from an area of the melting peak is 20 J/g or more, and the melting peak has a half value width of 10° C. or less; (3) when the Mw falls within a range of 1,000 to 5,000 and an average number of carbon atoms (Cn) of the α-olefins falls within a range of 20 to 40, the Mw, the Cn, and the Tm measured with the DSC satisfy the relationship, 0.0025×Mw+(Cn×3.3812−29.5)≦Tm≦0.0025×Mw+((Cn+1)×3.3812−29.5); and (4) a stereoregularity index [M
2
] derived from a chain of the α-olefins each having 20 to 40 carbon atoms is 20% by mol or more.
提供的是一种α-烯烃聚合物,具有分子量和熔点之间的优异平衡,是由一种或多种具有20至40个碳原子的α-烯烃聚合而成,并满足以下要求(1)至(4):(1)α-烯烃聚合物具有分子量分布(Mw / Mn),通过
GPC法测量的聚
苯乙烯的重均分子量(Mw)和数均分子量(Mn)确定为2或以下,并且具有Mw小于或等于5,000的值;(2)使用
DSC测量α-烯烃聚合物的熔点(Tm)仅显示一个熔化峰,从熔化峰的面积计算出的熔化热吸收(AH)为20 J / g或更高,并且熔化峰的半值宽度为10℃或更小;(3)当Mw在1,000至5,000范围内,α-烯烃的平均碳原子数(Cn)在20至40范围内时,使用
DSC测量的Mw,Cn和Tm满足关系式,0.0025×Mw +(Cn×3.3812-29.5)≦ Tm ≦0.0025×Mw +((Cn + 1)×3.3812-29.5);(4)从具有20至40个碳原子的α-烯烃链中派生的立体异构指数[M2]为20%摩尔或更高。