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24 条记录 (耗时 0.021 秒)

    Solid phase deformation process
    4.
    发明授权
    Solid phase deformation process 失效
    固相变形过程

    公开(公告)号：US5096654A

    公开(公告)日：1992-03-17

    申请号：US379735

    申请日：1989-07-13

    申请人： Gordon Craggs ,  Anthony K. Powell ,  Ian M. Ward

    发明人： Gordon Craggs ,  Anthony K. Powell ,  Ian M. Ward

    IPC分类号： B29C47/00 ,  B29C47/54 ,  B29C55/30

    CPC分类号： B29C47/0004 ,  B29C47/54 ,  B29C55/30 ,  B29C47/0021 ,  B29K2023/06

    摘要： A process for the solid phase deformation of orientable, semi-crystalline, thermoplastic, polymeric material, in particular polyethylene, is provided in which an improvement of the mechanical properties of the polyethylene is achieved. The process for producing a product from linear polyethylene includes forming a workpiece which is to be extruded in the solid phase by consolidating a mass of solid particulate linear polyethylene under heat and pressure. The resulting workpiece is subjected to heat treatment under pressure to cause the polyethylene to crystallize in an extended chain morphology and to have a melting point of at least 139.5.degree. C. and a density of at least 0.98 g/cm.sup.3. Thereafter the workpiece of polyethylene is deformed in the solid phase to provide a polyethylene product by, for example, passage through a die, the workpiece being subjected to a deformation extrusion ratio of at least 3 and preferably 3 to 25. The process in accordance with the invention allows more efficient processing of linear polyethylene having a weight average molecular weight of greater than 350,000 than had hitherto been possible.

    摘要翻译： 提供了可取向的，半结晶的，热塑性的聚合物材料，特别是聚乙烯的固相变形方法，其中实现了聚乙烯的机械性能的改善。 从线性聚乙烯制造产品的方法包括通过在热和压力下固化大量的固体颗粒状线性聚乙烯来形成要在固相中挤出的工件。 所得到的工件在压力下进行热处理，使得聚乙烯以延长链形态结晶，并且具有至少139.5℃的熔点和至少0.98g / cm 3的密度。 此后，聚乙烯的工件在固相中变形，以通过例如通过模具提供聚乙烯产品，工件经受至少3，优选3至25的变形挤出比。根据 本发明允许对迄今为止可能的重均分子量大于350,000的线性聚乙烯进行更有效的加工。

    Crosslinking of polymers
    6.
    发明授权
    Crosslinking of polymers 失效
    聚合物的交联

    公开(公告)号：US6020394A

    公开(公告)日：2000-02-01

    申请号：US27709

    申请日：1998-02-23

    申请人： Richard A. Jones ,  Ian M. Ward

    发明人： Richard A. Jones ,  Ian M. Ward

    IPC分类号： C08F2/50 ,  C08F8/00 ,  C08J3/28 ,  C08F2/48

    CPC分类号： C08J3/28 ,  C08J2323/02

    摘要： A process for preparing a modified polyalkylene, preferably polyethylene or polypropylene, polymer product is described. The process involves treating the polymer in an impregnation step with UV radiation in the presence of a carbonyl bearing photoinitiator species and a crosslinking species. The radiation may take place in a gaseous or liquid environment which is substantially free of oxygen gas but which comprises at least one of the species.

    摘要翻译： 描述了制备改性聚亚烷基，优选聚乙烯或聚丙烯聚合物产物的方法。 该方法包括在含有带羰基的光引发剂物质和交联物质存在下用UV辐射在浸渍步骤中处理聚合物。 辐射可以在基本上不含氧气但包含至少一种物质的气态或液体环境中进行。

    Polymer irradiation
    7.
    发明授权
    Polymer irradiation 失效
    聚合物照射

    公开(公告)号：US5160464A

    公开(公告)日：1992-11-03

    申请号：US180707

    申请日：1988-03-08

    申请人： Ian M. Ward ,  Denis W. Woods ,  Walter K. Busfield

    发明人： Ian M. Ward ,  Denis W. Woods ,  Walter K. Busfield

    IPC分类号： C08F6/00 ,  C08F8/00 ,  C08F10/00 ,  C08F255/00 ,  C08J3/28 ,  C08J7/18 ,  D06M10/00 ,  D06M101/00 ,  D06M101/16 ,  D06M101/18

    CPC分类号： C08J7/18 ,  C08F255/00 ,  D06M10/008

    摘要： A process for the preparation of an oriented homo- or co-polyalkene material of improved strain rate sensitivity, which process comprises subjecting the oriented homo- or co-polyalkene material having a weight average molecular weight (M.sub.w).ltoreq.350,000, a number average molecular weight (M.sub.n).gtoreq.5,000, and a 2% secant modulus of at least 10 GPa at a strain rate of 2.times.10.sup.-5 sec.sup.-1 to a high energy irradiation of a dosage of at least 1 Mrad and not more than 60 Mrads at an elevated temperature in vacuo or in an inert or sensitizing atmosphere.

    摘要翻译： 一种制备具有改进的应变速率敏感性的取向的均聚或共聚烯烃材料的方法，该方法包括使重均分子量（＆amp;上升＆Mw）为350,000的定向的均聚或共聚烯烃材料， 数均分子量（＆Upbar＆Mn）≥5000，2×10-5秒-1的应变速率至少为10GPa的2％正割模量与至少1Mrad的剂量的高能量照射而不是 在真空中或在惰性或致敏气氛中在升高的温度下超过60个Mrads。