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    Process for the production of block copolymer of propylene
    1.
    发明授权
    Process for the production of block copolymer of propylene 失效
    生产丙烯嵌段共聚物的方法

    公开(公告)号：US4772661A

    公开(公告)日：1988-09-20

    申请号：US934801

    申请日：1986-11-25

    申请人： Tadashi Asanuma ,  Mitsuru Ito ,  Kaneo Ito ,  Shigeru Kimura ,  Nobutaka Uchikawa ,  Ichiro Fujio

    发明人： Tadashi Asanuma ,  Mitsuru Ito ,  Kaneo Ito ,  Shigeru Kimura ,  Nobutaka Uchikawa ,  Ichiro Fujio

    IPC分类号： B23Q39/02 ,  C08F2/00 ,  C08F297/08

    CPC分类号： C08F297/083

    摘要： A block copolymer of propylene is produced by using propylene itself as a liquid medium, conducting continuous polymerization (former-stage polymerization) of propylene alone or propylene and a small amount of ethylene at first and then conducting batchwise copolymerization (latter-stage polymerization) of ethylene and propylene. The amount of an activity improver to be added to a polymerization tank for the latter-stage polymerization and/or the polymerization time of the latter-stage polymerization are controlled in accordance with the amount of a slurry transferred from a polymerization tank for the former-stage polymerization to the polymerization tank for the latter-stage polymerization so as to maintain the ratio of the amount of the polymer polymerized by the former-stage polymerization to the amount of the polymer polymerized by the latter-stage polymerization constant in the block copolymer.

    摘要翻译： 丙烯的嵌段共聚物通过使用丙烯本身作为液体介质，首先进行单独的丙烯或丙烯的连续聚合（前段聚合）和少量乙烯，然后进行分批共聚（后期聚合） 乙烯和丙烯。 添加到用于后期聚合的聚合槽中的活性改进剂的量和/或后期聚合的聚合时间的量根据从前者聚合的聚合槽转移的浆料的量来控制， 进行后段聚合的聚合槽进行聚合，以保持前段聚合所聚合的聚合物的量与通过嵌段共聚物中的后期聚合常数聚合的聚合物的量的比例。

    Method for preparing block copolymers of propylene
    2.
    发明授权
    Method for preparing block copolymers of propylene 失效
    制备丙烯嵌段共聚物的方法

    公开(公告)号：US5175208A

    公开(公告)日：1992-12-29

    申请号：US377268

    申请日：1989-07-10

    申请人： Tadashi Asanuma ,  Mitsuru Ito ,  Tutomu Iwatani ,  Kaoru Kawanishi ,  Nobutaka Uchikawa ,  Shigeru Kimura ,  Ryuichi Sugimoto

    发明人： Tadashi Asanuma ,  Mitsuru Ito ,  Tutomu Iwatani ,  Kaoru Kawanishi ,  Nobutaka Uchikawa ,  Shigeru Kimura ,  Ryuichi Sugimoto

    IPC分类号： C08F297/08

    CPC分类号： C08F297/083

    摘要： An improved method for preparing block copolymers of propylene which comprises providing a polymerizer composed of at least two reaction vessels connected to one another, substantially homopolymerizing propylene in a first step and then copolymerizing ethylene and propylene in a second step in the presence of a stereoregular catalyst, characterized by carrying out the homopolymerization of propylene in the polymerizer composed of at least two reaction vessels connected to one another in series, then introducing the resulting polymer slurry into a countercurrent washing column and countercurrently washing the slurry with propylene, introducing the washed slurry withdrawn from the lower part of the washing column into a reaction vessel in the second step connected to the washing column and performing the polymerization of ethylene and propylene, of which ratio ranges from 15/85 to 95/5. According to this method, a block copolymer of propylene exhibiting excellent physical properties can be obtained efficiently.

    Method of controlling the molecular weight of polypropylene
    3.
    发明授权
    Method of controlling the molecular weight of polypropylene 失效
    控制聚丙烯分子量的方法

    公开(公告)号：US5098967A

    公开(公告)日：1992-03-24

    申请号：US258052

    申请日：1988-10-17

    申请人： Tadashi Asanuma ,  Ichiro Fujio ,  Nobutaka Uchikawa

    发明人： Tadashi Asanuma ,  Ichiro Fujio ,  Nobutaka Uchikawa

    IPC分类号： C08F2/02 ,  C08F10/06 ,  C08F110/06

    CPC分类号： C08F10/06 ,  C08F110/06 ,  Y10S526/902 ,  Y10S526/905

    摘要： Disclosed herein is a method for controlling the molecular weight of a propylene homo- or co-polymer at a constant level upon subjecting propylene alone or a mixture of propylene and another .alpha.-olefin copolymerizable with propylene as a monomer or monomer mixture to bulk polymerization in the presence of hydrogen as a molecular weight modifier in a reaction tank equipped with a reflux condenser. According to the present invention, it is possible to prepare continuously a propylene homo- or copolymer, the molecular weight of which is controlled at a desired level, by measuring moment by moment the quantity of heat removed from the reaction tank, calculating the amount of the monomer or monomer mixture polymerized in the reaction tank based on the thus-calculated quantity, determining in advance the relationship between molecular weights and the volumes of hydrogen consumption required per unit amounts of corresponding polypropylene homo- or co-polymers, calculating the volume of hydrogen which is to be introduced into the reaction tank so as to obtain polypropylene of a desired molecular weight from the above relationship and the above-calculated polymerized amount, and charging hydrogen into the reaction tank in accordance with the above-calculated volume of hydrogen which varies from time to time.

    摘要翻译： 本文公开了一种在丙烯单独或丙烯与可与丙烯共聚的另一种α-烯烃的混合物作为单体或单体混合物进行本体聚合的情况下，以恒定水平控制丙烯均聚物或共聚物的分子量的方法 在装有回流冷凝器的反应罐中作为分子量调节剂存在氢。 根据本发明，可以连续地制备其分子量控制在所需水平的丙烯均聚物或共聚物，通过测量瞬间从反应槽中除去的热量，计算出 基于由此计算的量在反应罐中聚合的单体或单体混合物，预先确定分子量与每单位量相应的聚丙烯均聚物或共聚物所需的氢消耗量之间的关系，计算 将从上述关系和上述计算的聚合量导入到反应槽中以获得所需分子量的聚丙烯的氢气，并根据上述计算的氢气体积将氢气加入到反应罐中 不时变化。

    Polypropylene fiber and a preparation process thereof
    7.
    发明授权
    Polypropylene fiber and a preparation process thereof 失效
    聚丙烯纤维及其制备方法

    公开(公告)号：US5478646A

    公开(公告)日：1995-12-26

    申请号：US15056

    申请日：1993-02-08

    申请人： Tadashi Asanuma ,  Tetsunosuke Shiomura ,  Shigeru Kimura ,  Nobutaka Uchikawa ,  Yoichi Kawai ,  Keigo Suehiro ,  Satoshi Fukushima

    发明人： Tadashi Asanuma ,  Tetsunosuke Shiomura ,  Shigeru Kimura ,  Nobutaka Uchikawa ,  Yoichi Kawai ,  Keigo Suehiro ,  Satoshi Fukushima

    IPC分类号： D01F6/06 ,  D02G3/00

    CPC分类号： D01F6/06 ,  Y10T428/2913 ,  Y10T428/2929 ,  Y10T428/2931

    摘要： A fiber excellent in strength and having an average size of 10,000-0.1 denier can be obtained by extruding a raw material composed mainly of a polypropylene having a syndiotactic pentad fraction of 0.7 or more and optionally stretching the resulting extruded material.By using as the raw material a composition consisting of two kinds of polypropylenes each having an intrinsic viscosity .eta..sub.1 or .eta..sub.2, the log(.eta..sub.2 /.eta..sub.1) being more than 0.05 or less than -0.05, and a syndiotactic pentad fraction of 0.7 or more at a weight ratio of 95:5-5:95 or a composition consisting of at least 50 parts by weight of a syndiotactic polypropylene having the intrinsic viscosity .eta..sub.1 and a syndiotactic pentad fraction of 0.7 or above and at most 50 parts by weight of an isotactic polypropylene having the intrinsic viscosity .eta..sub.2, the extrudability is improved and the fiber stretching conditions are broadened.

    摘要翻译： 通过将主要由间同立构五单元组分为0.7以上的聚丙烯组成的原料挤出并任选地拉伸所得的挤出材料，可以获得强度优异且平均粒径为10,000-0.1旦尼尔的纤维。 通过使用由两种各自具有特性粘度eta 1或eta 2的聚丙烯组成的组合物，log（eta 2 / eta 1）大于0.05或小于-0.05，并且间同立构五单元组分数 0.7重量％以上，重量比为95:5.5:95的组合物或由至少50重量份的特性粘度η1和间同立构五单元组分数为0.7以上至多50份的间同立构聚丙烯组成的组合物 的特性粘度等于2的全同立构聚丙烯，可挤出性提高，纤维拉伸条件变宽。