申请人:IDEMITSU PETROCHEMICAL CO. LTD.
公开号:EP0302297A1
公开(公告)日:1989-02-08
The present invention provides a butene-1 copolymer which comprises 60 to 98.5 mol % of butene-1 unit, 0.5 to 20 mol % of ethylene unit and 0.5 to 20 mol % of another α-olefin unit(s), said butene-1 copolymer having an intrinsic viscosity of 0.9 to 7.2 dl/g measured in a decalin solution heated to 135 °C, a density of 0.840 to 0.920 g/cm³, a weight-average molecular weight/number-average molecular weight ratio of 2 to 15, a maximum melting point of 50 to 120 °C measured by a differential scanning calorimeter, a soluble matter content of the butene-1 copolymer in boiling diethyl ether of 3 to 50 wt % and a crystallinity of 5 to 60 % measured by X-ray diffractometry, and containing one or less neighboring bond of the ethylene unit and the other α-olefin unit(s) per 1,000 carbon atoms measured by NMR, which copolymer has excellent mechanical properties such as a high tensile strength, high impact strength and etc., good working characteristics, small change of shrinkage after molding, moderate flexibility, and good low-temperature impact properties such as retention of a high impact strength at a low temperature, and is used as various materials for, for example, films, wire sheaths or pipes.
本发明提供了一种丁烯-1 共聚物,它包括 60 至 98.5 摩尔%的丁烯-1 单元、0.5 至 20 摩尔%的乙烯单元和 0.5 至 20 摩尔%的另一种α-烯烃单元,所述丁烯-1 共聚物在加热至 135 °C 的癸醛溶液中测得的固有粘度为 0.9 至 7.2 dl/g,密度为 0.840 至 0.920 g/cm³,重量平均分子量/数量平均分子量比为 2 至 15,用差示扫描量热计测量的最大熔点为 50 至 120 °C,丁烯-1 共聚物在沸腾的二乙醚中的可溶物含量为 3 至 50 wt %,用 X 射线衍射仪测量的结晶度为 5 至 60 %、通过核磁共振测量,每 1,000 个碳原子中含有一个或更少的乙烯单元和其他 α-烯烃单元的邻接键,该共聚物具有优异的机械性能,如高拉伸强度、高冲击强度等。,这种共聚物具有良好的机械性能,如较高的拉伸强度、较高的冲击强度等,良好的加工性能,成型后收缩率变化小,柔韧性适中,以及良好的低温冲击性能,如在低温下仍能保持较高的冲击强度,可用作薄膜、电线护套或管道等各种材料。