公开(公告)号：US5693719A

公开(公告)日：1997-12-02

申请号：US573427

申请日：1995-12-15

申请人： Yukitaka Goto ,  Nobuaki Sakurai ,  Tadashi Takahashi ,  Katsumi Hirakawa ,  Yoichi Maeda ,  Yoshihiko Sasaki ,  Satoshi Nishimura ,  Masataka Souda

发明人： Yukitaka Goto ,  Nobuaki Sakurai ,  Tadashi Takahashi ,  Katsumi Hirakawa ,  Yoichi Maeda ,  Yoshihiko Sasaki ,  Satoshi Nishimura ,  Masataka Souda

IPC分类号： C08F2/00 ,  C08F10/02 ,  C08F210/16 ,  C08L23/08

CPC分类号： C08F10/02 ,  C08F210/16

摘要： An ethylene polymer which is useful for molding inflation film having a particularly excellent moldability is provided. The ethylene polymer is obtainable by the first and second steps and satisfying the following conditions (a) to (d): (a) the polymer produced in the first polymerization step having an weight average molecular weight (Mw,.sub.1) in the range of 6.times.10.sup.5 to 4.times.10.sup.6 ; (b) the ratio (Mw,.sub.2 /Mw,.sub.1) of the weight average molecular weight of the polymer produced in the first polymerization step (Mw,.sub.1) and the weight average molecular weight of the polymer produced in the second polymerization step (Mw,.sub.2) being in the range of 0.7 to 1.4; (c) the molecular weight in which the integration fraction from the low molecular weight is equal to 1/2 of the weight fraction (W.sub.2) of the polymer produced in the second polymerization step being in the range of 5.times.10.sup.3 to 3.times.10.sup.4 ; and (d) the weight fraction (W.sub.1) of the polymer produced in the first step being in the range of 0.45 to 0.70, and the weight fraction (W.sub.2) of the polymer produced in the second step being in the range of 0.30 to 0.55.

摘要翻译： 提供了一种用于模塑具有特别优异成型性的膨胀膜的乙烯聚合物。 乙烯聚合物可通过第一步和第二步获得，并满足以下条件（a）至（d）：（a）在第一聚合步骤中制备的聚合物的重均分子量（Mw，1） 6×10 5至4×10 6; （b）在第一聚合步骤中制备的聚合物的重均分子量（Mw，1）和在第二聚合步骤中制备的聚合物的重均分子量（Mw，2 / Mw，1） Mw，2）在0.7至1.4的范围内; （c）在第二聚合步骤中制备的聚合物的重量分数（W 2）的从低分子量的积分分数等于+ E，f 1/2 + EE的分子量在5×10 3 至3x104; 和（d）在第一步骤中制备的聚合物的重量分数（W1）在0.45至0.70的范围内，并且在第二步骤中制备的聚合物的重量分数（W2）在0.30至0.55的范围内 。