Polyethylene Molding Composition for Producing Blown Films Having Improved Processability
    11.
    发明申请
    Polyethylene Molding Composition for Producing Blown Films Having Improved Processability 审中-公开
    用于生产具有改进的加工性能的吹塑薄膜的聚乙烯模塑组合物

    公开(公告)号:US20080139750A1

    公开(公告)日:2008-06-12

    申请号:US11885356

    申请日:2006-02-23

    IPC分类号: C08L23/04 C08J5/18

    摘要: The invention relates to a polyethylene molding composition having a multimodal molar mass distribution particularly suitable for blow molding films having a thickness in the range from 8 to 200 μm. The molding composition has a density at a temperature of 23° C. in the range from 0.953 to 0.960 g/cm3 and an MFR190/5 of the final product after extrusion in the range from 0.10 to 0.50 dg/min. The composition comprises from 30 to 60% by weight of a first ethylene polymer fraction made of a homopolymer A having a first molecular weight, from 22 to 40% by weight of a second ethylene polymer fraction made of a further homopolymer or first copolymer B of ethylene and at least one first comonomer from the group of olefins having from 4 to 8 carbon atoms, the first copolymer B having a second molecular weight higher than the first molecular weight, and from 10 to 30% by weight of a third ethylene polymer fraction made of a second copolymer C having a third molecular weight higher than the second molecular weight. The molding composition of the invention allows to produce thin films having improved processability without impairing the mechanical properties.

    摘要翻译: 本发明涉及一种具有多峰摩尔质量分布的聚乙烯模塑组合物,特别适用于厚度在8至200μm之间的吹塑薄膜。 该模塑组合物在23℃的温度下的密度为0.953至0.960g / cm 3的范围内,最终产品的MFR为190/5 / 挤出范围为0.10至0.50dg / min。 该组合物包含30至60重量%的由具有第一分子量的均聚物A制成的第一乙烯聚合物部分,22至40重量%的由其它均聚物或第一共聚物B制成的第二乙烯聚合物部分 乙烯和来自具有4至8个碳原子的烯烃基团的至少一种第一共聚单体,第一共聚物B具有高于第一分子量的第二分子量和10至30重量%的第三乙烯聚合物部分 由具有高于第二分子量的第三分子量的第二共聚物C制成。 本发明的模塑组合物允许制造具有改进加工性能的薄膜而不损害机械性能。

    Process for the preparation of a polyolefin polymer with improved wax deposition
    13.
    发明授权
    Process for the preparation of a polyolefin polymer with improved wax deposition 有权
    用于制备具有改进的蜡沉积的聚烯烃聚合物的方法

    公开(公告)号:US08802795B2

    公开(公告)日:2014-08-12

    申请号:US13818845

    申请日:2011-08-30

    IPC分类号: C08F2/12 C08F6/24 C08F210/08

    摘要: Process for the preparation of a polyolefin polymer by continuously polymerizing one or more olefin monomers in suspension at temperatures of from 40° C. to 120° C. and pressures of from 0.1 to 10 MPa in the presence of a polymerization catalyst in at least one polymerization reactor, comprising a) withdrawing a suspension of solid polyolefin particles in a suspension medium from the polymerization reactor, wherein the suspension has a temperature of from 65° C. to 120° C.; b) feeding the suspension withdrawn from the polymerization reactor to a moderating vessel; c) keeping the suspension in the moderating vessel at a temperature of from 60° C. to 85° C. for a time sufficiently long that the mean residence time of the suspension in the moderating vessel is at least 5 min; d) withdrawing suspension from the moderating vessel; e) cooling the suspension withdrawn from the moderating vessel to a temperature of from 20° C. to 55° C.; and f) mechanically separating the solid polyolefin particles from the liquid suspension medium, and method for controlling the content of hydrocarbons with from 14 to 300 carbon atoms in a polyolefin polymer prepared by polymerizing one or more olefin monomers in suspension.

    摘要翻译: 在聚合催化剂存在下,在至少一种聚合催化剂的存在下,通过在40℃至120℃的温度和0.1至10MPa的温度下将悬浮液中的一种或多种烯烃单体连续聚合来制备聚烯烃聚合物的方法 聚合反应器,包括a)从聚合反应器中取出固体聚烯烃颗粒在悬浮介质中的悬浮液,其中悬浮液的温度为65℃至120℃; b)将从聚合反应器中取出的悬浮液送入调节容器; c)将悬浮液在调节容器中保持在60℃至85℃的温度下足够长的时间,使得悬浮液在调节容器中的平均停留时间为至少5分钟; d)从缓和容器中取出悬浮液; e)将从调节容器中取出的悬浮液冷却至20℃至55℃的温度; 和f)从液体悬浮介质中机械分离固体聚烯烃颗粒,以及通过在悬浮液中聚合一种或多种烯烃单体制备的聚烯烃聚合物中控制含有14至300个碳原子的烃的含量的方法。

    Method for Transitioning Between Incompatible Olefin Polymerization Catalyst Systems
    16.
    发明申请
    Method for Transitioning Between Incompatible Olefin Polymerization Catalyst Systems 有权
    不相容的烯烃聚合催化剂体系的转化方法

    公开(公告)号:US20110294957A1

    公开(公告)日:2011-12-01

    申请号:US13133803

    申请日:2009-12-17

    摘要: A method for transitioning from a Ziegler-Natta to a Phillips catalyst system for the olefin polymerization reaction in one reactor, preferably a gas phase reactor, is described. The method comprises the steps of a) discontinuing a first olefin polymerization reaction performed in the presence of the Ziegler-Natta catalyst system; b) performing a second olefin polymerization reaction in the presence of a further catalyst system comprising catalyst components (A) and (B) producing, respectively, a first and a second polyolefin fraction, wherein the Mw of the first polyolefin fraction is less than the Mw of the second polyolefin fraction and the initial activity of catalyst component (A) exceeds the initial activity of catalyst component (B); and c) performing a third olefin polymerization reaction the presence of the Phillips catalyst system. Thanks to this method, there is no need to empty the reactor after each olefin polymerization reaction, and the transitioning time needed to attain the desired quality of the polyolefin obtained in each olefin polymerization reaction subsequent to the first one is sufficiently short to permit a quick and reliable change of production.

    摘要翻译: 描述了在一个反应​​器,优选气相反应器中从齐格勒 - 纳塔过渡到用于烯烃聚合反应的菲利普斯催化剂体系的方法。 该方法包括以下步骤:a)停止在齐格勒 - 纳塔催化剂体系存在下进行的第一种烯烃聚合反应; b)在另外的催化剂体系存在下进行第二烯烃聚合反应,所述催化剂体系包含分别产生第一和第二聚烯烃部分的催化剂组分(A)和(B),其中第一聚烯烃部分的Mw小于 第二聚烯烃级分的Mw和催化剂组分(A)的初始活性超过催化剂组分(B)的初始活性; 和c)进行第三烯烃聚合反应的存在的菲利浦催化剂体系。 由于这种方法,在每个烯烃聚合反应之后不需要清空反应器,并且在第一个烯烃聚合反应之后获得的每个烯烃聚合反应中获得的聚烯烃所需的质量所需的转化时间足够短,以使快速 可靠的生产变更。

    Process for homogenizing and pelletizing a polyethylene composition
    18.
    发明授权
    Process for homogenizing and pelletizing a polyethylene composition 有权
    均化和造粒聚乙烯组合物的方法

    公开(公告)号:US09289935B2

    公开(公告)日:2016-03-22

    申请号:US14116087

    申请日:2012-05-08

    摘要: A process for homogenizing and pelletizing a polyethylene composition comprising the steps of a) providing a polyethylene composition having a density of from 0.90 g/cm3 to 0.97 g/cm3 and a melt flow rate MFR21.6 at 190° C. under a load of 21.6 kg of from 1 g/10 min to 80 g/10 min, b) melting the polyethylene composition; c) passing the melt through a combination of screens consisting of screens having a mesh opening of at least 205 μm and comprising at least two screens having a mesh opening of from 205 μm to 350 μm; and e) pelletizing the molten polyethylene composition, the use of a polyethylene composition obtained by such a process for the preparation of films, fibers, pipes, blow-molded articles, injection-molded articles, compression-molded articles or rotomolded articles and films, fibers, pipes, blow-molded articles, injection-molded articles, compression-molded articles or rotomolded articles prepared from a polyethylene composition obtained by such a process.

    摘要翻译: 一种聚乙烯组合物均质和造粒的方法,包括以下步骤:a)提供密度为0.90g / cm 3至0.97g / cm 3的聚乙烯组合物和190℃下的熔体流动速率MFR 21.6, 21.6kg,从1g / 10min至80g / 10min,b)熔融聚乙烯组合物; c)使熔体通过由具有至少205μm的网孔的筛网组成的筛网组合,并且包括至少两个网孔为205μm至350μm的筛网; 和e)使熔融的聚乙烯组合物造粒,使用通过这种制备薄膜,纤维,管,吹塑制品,注射成型制品,压塑制品或滚塑制品和薄膜的方法获得的聚乙烯组合物, 纤维,管,吹塑制品,注射成型制品,压塑制品或由通过这种方法获得的聚乙烯组合物制备的滚塑制品。

    PROCESS FOR HOMOGENIZING AND PELLETIZING A POLYETHYLENE COMPOSITION
    20.
    发明申请
    PROCESS FOR HOMOGENIZING AND PELLETIZING A POLYETHYLENE COMPOSITION 有权
    均聚和聚合聚乙烯组合物的方法

    公开(公告)号:US20140145376A1

    公开(公告)日:2014-05-29

    申请号:US14116087

    申请日:2012-05-08

    IPC分类号: B29C47/00

    摘要: A process for homogenizing and pelletizing a polyethylene composition comprising the steps of a) providing a polyethylene composition having a density of from 0.90 g/cm3 to 0.97 g/cm3 and a melt flow rate MFR21.6 at 190° C. under a load of 21.6 kg of from 1 g/10 min to 80 g/10 min, b) melting the polyethylene composition; c) passing the melt through a combination of screens consisting of screens having a mesh opening of at least 205 μm and comprising at least two screens having a mesh opening of from 205 μm to 350 μm; and e) pelletizing the molten polyethylene composition, the use of a polyethylene composition obtained by such a process for the preparation of films, fibers, pipes, blow-molded articles, injection-molded articles, compression-molded articles or rotomolded articles and films, fibers, pipes, blow-molded articles, injection-molded articles, compression-molded articles or rotomolded articles prepared from a polyethylene composition obtained by such a process.

    摘要翻译: 一种聚乙烯组合物均质和造粒的方法,包括以下步骤:a)提供密度为0.90g / cm 3至0.97g / cm 3的聚乙烯组合物和190℃下的熔体流动速率MFR 21.6, 21.6kg,从1g / 10min至80g / 10min,b)熔融聚乙烯组合物; c)使熔体通过由具有至少205μm的网孔的筛网组成的筛网组合,并且包括至少两个网孔为205μm至350μm的筛网; 和e)使熔融的聚乙烯组合物造粒,使用通过这种制备薄膜,纤维,管,吹塑制品,注射成型制品,压塑制品或滚塑制品和薄膜的方法获得的聚乙烯组合物, 纤维,管,吹塑制品,注射成型制品,压塑制品或由通过这种方法获得的聚乙烯组合物制备的滚塑制品。