申请人:Idemitsu Kosan Co., Ltd.
公开号:US08178635B2
公开(公告)日:2012-05-15
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 [M2] 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,其分子量和熔点之间具有良好的平衡,是由20至40个碳原子的一种或多种α-烯烃聚合而成,满足以下要求(1)至(4):(1)α-烯烃聚合物的分子量分布(Mw/Mn)以聚苯乙烯为标准,由重均分子量(Mw)和数均分子量(Mn)确定,为2或以下,Mw为5,000或以下;(2)用DSC测量α-烯烃聚合物的熔点(Tm)显示一个熔融峰,从熔融峰的面积计算的熔融热吸收(AH)为20 J/g或更高,熔融峰的半峰宽度为10℃或以下;(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,用DSC测量的Mw、Cn和Tm满足以下关系式:0.0025×Mw+(Cn×3.3812−29.5)≦Tm≦0.0025×Mw+((Cn+1)×3.3812−29.5);(4)由具有20至40个碳原子的α-烯烃链导出的立体规整指数[M2]为20%摩尔分数或更高。