申请人:Asahi Kasei Kogyo Kabushiki Kaisha
公开号:EP0234512A2
公开(公告)日:1987-09-02
crystalline block copolymer containing at least a triblock chain represented by the formula A-B-C or containing at least a radial structure represented by the formula (D-EX in the polymer chain is provided. These triblock chains or radial structures comprise blocks of a homopolymer of a vinyl aromatic compound or a copolymer of a vinylaromatic compound with another vinylaromatic compound or a conjugated diene compound having a glass transition temperature of not lower that 50°C and a weight average molecular weight in the range of from 2,000 to 100,000 and blocks of a homopolymer of a conjugated diene compound or a copolymer of a conjugated diene compound with another conjugated diene compound or a copolymer of a conjugated diene compound having less that 20 wt.% of a vinyl aromatic compound having a glass transition temperature of not higher than 10°C and a crystallinity at 25°C and a 1,4-trans-linkage ratio in the conjugated diene portion of 80 % or higher.
These crystalline block copolymers are produced by polymerization of the respective monomers in the presence of a composite catalyst comprising the catalyst components (a), (b) and (c), or (a), (b), (c) and (d), wherein
(a) is an organic compound of barium or strontium;
(b) is an organic compound of lithium;
(c) is an organomagnesium compound; and
(d) is an organoaluminum or organozinc compound.
Further provided are shaped bodies obtainable by injection, extrusion or compression molding comprising such crystalline block copolymer.
本发明提供了一种结晶嵌段共聚物,其聚合物链中至少含有一个由式 A-B-C 表示的三嵌段链或至少含有一个由式(D-EX)表示的径向结构。这些三嵌段链或径向结构包括乙烯基芳香族化合物均聚物嵌段,或乙烯基芳香族化合物与另一种乙烯基芳香族化合物或共轭二烯化合物的共聚物嵌段,其玻璃化转变温度不低于 50℃,重量平均分子量在 2,000 至 100,000 之间;以及共轭二烯化合物均聚物嵌段,或共轭二烯化合物与另一种共轭二烯化合物的共聚物嵌段,或共轭二烯化合物与乙烯基芳香族化合物或共轭二烯化合物的共聚物嵌段,其玻璃化转变温度不低于 50℃,重量平均分子量在 2,000 至 100,000 之间。乙烯基芳香族化合物的共聚物,其玻璃化转变温度不高于 10°C,结晶度为 25°C,共轭二烯部分的 1,4-反式连接比例为 80% 或更高。
这些结晶嵌段共聚物是在由催化剂组分(a)、(b)和(c)或(a)、(b)、(c)和(d)组成的复合催化剂存在下,通过聚合各单体而制得的,其中
(a) 是钡或锶的有机化合物;
(b) 是锂的有机化合物
(c) 是一种有机镁化合物;和
(d) 有机铝或有机锌化合物。
此外,还提供了可通过注塑、挤压或压缩成型获得的由此类结晶嵌段共聚物组成的成型体。