Process for the production of block copolymer of propylene
    21.
    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

    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。

    Process for the continuous discharge of a slurry
    22.
    发明授权
    Process for the continuous discharge of a slurry 失效
    用于连续排出浆料的方法

    公开(公告)号:US4632976A

    公开(公告)日:1986-12-30

    申请号:US724635

    申请日:1985-04-16

    IPC分类号: C08F6/00 C08F6/24

    CPC分类号: C08F6/24

    摘要: A process is provided herein wherein a solid polymer slurry diluted with a specific diluent is continuously discharged under controlled conditions from a high pressure zone to a low pressure zone substantially maintained at atmospheric pressure and the slurry is then separated into said diluent and dried polymer, the improvement wherein the discharged amount of the solid polymer slurry is strictly controlled by varying the heat in the second zone and simultaneously adding a diluent which is gaseous under normal temperature and pressure so that by the control of these two perimeters a continuous slurry discharge can be maintained at predetermined levels.

    摘要翻译: 本文提供一种方法,其中用特定稀释剂稀释的固体聚合物浆料在受控条件下从高压区域连续排出至基本维持在大气压下的低压区域,然后将浆料分离成所述稀释剂和干燥聚合物, 其中固体聚合物浆料的排出量通过改变第二区域中的热量并同时加入在常温常压下为气态的稀释剂来严格控制,使得通过这两个周边的控制可以保持连续的浆料排出 在预定水平。

    Method of controlling the molecular weight of polypropylene
    23.
    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

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

    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。

    Purification process of polymerization solvent
    24.
    发明授权
    Purification process of polymerization solvent 失效
    聚合溶剂的纯化过程

    公开(公告)号:US4725338A

    公开(公告)日:1988-02-16

    申请号:US832412

    申请日:1986-02-24

    摘要: A process for purifying a solvent suitable for use in the polymerization of an olefin in the presence of a Ziegler-Natta catalyst, which comprises feeding the polymerization solvent to a stage lower than a chimney tray of a multi-stage distillation column, said chimney tray being provided at a height between the top and bottom of the column, feeding an organoaluminum compound to a stage higher than the chimney tray, drawing out a condensate from the chimney tray, heating the condensate to produce heated vapor, introducing the heated vapor to the chimney tray or to a stage higher than the chimney tray but lower than the stage to which the organoaluminum compound has been fed, and drawing the solvent in a purified state from the top.

    摘要翻译: 一种在齐格勒 - 纳塔催化剂存在下纯化适用于烯烃聚合的溶剂的方法,该方法包括将聚合溶剂进料到比多级蒸馏塔的烟囱式塔板低的阶段,所述烟囱式塔板 提供在塔的顶部和底部之间的高度,将有机铝化合物供给到高于烟囱托盘的台阶上,从烟囱托盘抽出冷凝物,加热冷凝物以产生加热的蒸汽,将加热的蒸气引入到 烟囱式塔板或高于烟囱式塔架但比有机铝化合物进料的阶段低的阶段,并从顶部抽出处于纯化状态的溶剂。

    Insulating composition and formed article thereof
    25.
    发明授权
    Insulating composition and formed article thereof 失效
    绝缘组合物及其成型体

    公开(公告)号:US5656371A

    公开(公告)日:1997-08-12

    申请号:US495792

    申请日:1995-06-27

    摘要: An insulating composition comprising a syndiotactic polypropylene (s-PP) having a syndiotactic pentad ratio of not less than 0.7 and an MFR of 0.05-2.0 g/10 min. The composition of the present invention comprising a specific s-PP can provide an article having superior electric properties and mechanical properties. In particular, the article can retain superior electric properties and mechanical properties even after rapid cooling or gradual cooling for re-processing of said article. Accordingly, the composition of the present invention can be suitable used for insulating layer, coating layer of various power cables inclusive of high voltage wires and low voltage wires, coating layer of optical fibers and insulator of wire-connecting structures.

    摘要翻译: 一种绝缘组合物,其包含间同立构五单元组比不小于0.7,MFR为0.05-2.0g / 10min的间同立构聚丙烯(s-PP)。 包含特定s-PP的本发明的组合物可以提供具有优异的电性能和机械性能的制品。 特别地,即使在快速冷却或逐渐冷却以对所述制品进行再处理之后,该制品也能保持优异的电性能和机械性能。 因此,本发明的组合物可以适用于绝缘层,包括高压电线和低压电线的各种电力电缆的涂层,光纤的涂层和电线连接结构的绝缘体。