Peroxide modified PP/PE blends with superior melt strength
    1.
    发明授权
    Peroxide modified PP/PE blends with superior melt strength 失效
    具有优异熔体强度的过氧化物改性PP / PE共混物

    公开(公告)号:US5639818A

    公开(公告)日:1997-06-17

    申请号:US212630

    申请日:1994-03-11

    摘要: The instant invention is directed to a process for preparing peroxide modified polypropylene/polyethylene blends that have superior extrusion coating properties. More specifically, the peroxide modified PP/PE blends produced by the instant invention exhibit a pronounced viscosity upturn at low frequencies (about

    摘要翻译: 本发明涉及一种制备具有优异的挤出涂布性能的过氧化物改性聚丙烯/聚乙烯共混物的方法。 更具体地说,本发明生产的过氧化物改性的PP / PE共混物在动态流变学数据中在低频(约<1.0rad / sec)下表现出显着的粘度上升。 具体地说,共混物在低于约1.0rad / sec的频率下显示其动态复数粘度ηa和动态储能模量G'值的增加。 本发明还涉及由本发明的方法生产的过氧化物改性的PP / PE共混物。 与现有技术的混合物相比,由本发明方法制备的这种聚合物共混物表现出优异的动态神学性质,特别是熔体强度。 此外,本发明的过氧化物改性的PP / PE共混物显示出显着降低的拉伸共振行为。 因此,具有上述特征的本发明的PP / PE共混物将适用于各种各样的应用,例如热成型,吹塑和优选的挤出涂层。

    Impact strength, stress-whitening and bruise-resistance for impact
modified polypropylene
    3.
    发明授权
    Impact strength, stress-whitening and bruise-resistance for impact modified polypropylene 失效
    抗冲改性聚丙烯的冲击强度,应力增白和抗冲击性

    公开(公告)号:US5459201A

    公开(公告)日:1995-10-17

    申请号:US212754

    申请日:1994-03-11

    摘要: The present invention relates to a process for preparing high melt flow rate thermoplastic compositions that have improved impact and bruise-resistance properties and to the thermoplastic composition that are produced by the process of the instant invention. Specifically, the process comprises the steps of precontacting a non-crosslinked elastomeric polymeric component with a peroxide compound at a temperature below the decomposition temperature of the peroxide and below the melting point of the non-crosslinked polymeric component to produce a peroxide adsorbed polymeric component; and melt mixing the aforementioned peroxide adsorbed polymeric component with a high propylene content polymeric component selected from the group consisting of homopolymers of propylene, block copolymers of propylene and ethylene, and thermoplastic olefin polymers at a temperature above the decomposition temperature of the peroxide.

    摘要翻译: 本发明涉及一种制备具有改善的冲击和抗腐蚀性能的高熔体流动速率的热塑性组合物的方法以及通过本发明的方法生产的热塑性组合物。 具体地说,该方法包括以下步骤:在低于过氧化物的分解温度并低于非交联聚合物组分的熔点的温度下将过渡化合物预先接触过氧化物,以产生过氧化物吸附的聚合物组分; 并且在高于过氧化物分解温度的温度下将上述过氧化物吸附的聚合物组分与选自丙烯的均聚物,丙烯和乙烯的嵌段共聚物以及热塑性烯烃聚合物的高丙烯含量的聚合物组分熔融混合。

    High performance blow molding resins and process for their preparation
    6.
    发明授权
    High performance blow molding resins and process for their preparation 失效
    高性能吹塑树脂及其制备方法

    公开(公告)号:US5486575A

    公开(公告)日:1996-01-23

    申请号:US208155

    申请日:1994-03-08

    申请人: Ramesh N. Shroff

    发明人: Ramesh N. Shroff

    摘要: A process is provided to improve the properties of polyethylene resins obtained from chromium catalyzed polymerizations and blow molded bottles produced therefrom. The process entails modifying the polyethylene resin by contacting the resin in a molten state with an organic peroxide at a temperature above the decomposition temperature of peroxide. Polyethylene resins utilized for the process have specific densities, melt indexes, long chain branching indexes, unsaturation contents and molecular weight distributions. Blow molded bottles produced from the modified resins have significantly increased top load stress crack resistance and improved swell characteristics.

    摘要翻译: 提供了一种改进由铬催化聚合获得的聚乙烯树脂和由其制备的吹塑瓶的性能的方法。 该方法需要通过在高于过氧化物的分解温度的温度下使熔融状态的树脂与有机过氧化物接触来改性聚乙烯树脂。 用于该方法的聚乙烯树脂具有特定的密度,熔体指数,长链支化指数,不饱和含量和分子量分布。 由改性树脂生产的吹塑瓶具有显着增加的顶部承载应力抗裂性和改善的膨胀特性。

    Blow molding extrusion die with rectangular slots
    7.
    发明授权
    Blow molding extrusion die with rectangular slots 失效
    具有矩形槽的吹塑挤出模具

    公开(公告)号:US5486333A

    公开(公告)日:1996-01-23

    申请号:US122248

    申请日:1993-09-16

    摘要: A die for a blow molding machine has at least one circumferential rectangular cutout section contiguous with the die exit in at least the die ring or the mandrel. The rectangular cutout section expands the material flow channel between the die ring and the mandrel to increase the volume flow of material passing through the die exit at the rectangular cutout section. However, the constant length of the rectangular cutout section in a longitudinal direction maintains a constant linear velocity of material flowing through the die exit.

    摘要翻译: 用于吹塑机的模具在至少模具环或心轴中具有与模具出口邻接的至少一个圆周矩形切口部分。 矩形切口部分使模具环和心轴之间的材料流动通道膨胀,以增加在矩形切口部分通过模具出口的材料的体积流量。 然而,矩形切口部分在纵向上的恒定长度保持流过模具出口的材料的恒定线速度。