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    Methods for producing multi-layer foamed sheets
    2.
    发明授权
    Methods for producing multi-layer foamed sheets 失效
    生产多层发泡片材的方法

    公开(公告)号：US06878318B2

    公开(公告)日：2005-04-12

    申请号：US10071185

    申请日：2002-02-11

    申请人： Akinobu Sakamoto ,  Shigehumi Takuno ,  Tatsuhiro Nagamatsu

    发明人： Akinobu Sakamoto ,  Shigehumi Takuno ,  Tatsuhiro Nagamatsu

    IPC分类号： C08J9/04 ,  B29C47/04 ,  B29C47/06 ,  B29C47/20 ,  B29K23/00 ,  B29K105/04 ,  B29L7/00 ,  B29L9/00 ,  B32B5/22 ,  B32B27/32 ,  B32B37/15 ,  C08F10/06 ,  B29C44/24

    CPC分类号： B29C47/0023 ,  B29C44/24 ,  B29C47/065 ,  B29C47/26 ,  B29K2023/086 ,  B29K2023/12 ,  B29L2009/00 ,  B32B5/22 ,  B32B27/32 ,  B32B37/153 ,  B32B2305/022 ,  Y10S264/92

    摘要： The invention provides, as a method for producing a multi-layer foamed sheet whose scale-like appearance has been improved by means of a multi-layer circular die coextrusion method, a method for producing a multi-layer foamed sheet having foam layers and non-foam layers by a multi-layer circular die coextrusion method which is a method for producing a multi-layer foamed sheet wherein the shear stress at the interface of each layer is 5000 Pa or higher and not higher than 50000 Pa, a method for producing a multi-layer foamed sheet wherein the resin of said non-foam layer is a linear propylenic resin having a melt flow rate of 5 to 30 g/10 minutes, and a method for producing a multi-layer foamed sheet wherein the resin of said foam layer is a propylenic resin whose melt tension (MT) at 190° C. and melt flow rate (MFR) at 230° C. satisfy the following equation A: MT≧7.52×MFR (−0.576)  [Equation A]

    摘要翻译： 本发明提供一种通过多层圆形模具共挤出法改善其鳞片状外观的多层发泡片材的制造方法，其特征在于，提供具有泡沫层和非泡沫层的多层发泡片材的制造方法， 通过多层圆形模头共挤出方法，其为每层界面处的剪切应力为5000Pa以上且50000Pa以下的多层发泡片材的制造方法， 一种多层发泡片材，其中所述非泡沫层的树脂是熔体流动速率为5至30g / 10分钟的线性丙烯酸树脂，以及制备多层发泡片材的方法，其中所述 泡沫层是在190℃下的熔融张力（MT）和230℃下的熔体流动速率（MFR）满足下列等式A的丙烯树脂：

    Process for producing uncrosslinked polypropylene-based resin foam sheets and uncrosslinked polypropylene-based resin foam sheets
    4.
    发明授权
    Process for producing uncrosslinked polypropylene-based resin foam sheets and uncrosslinked polypropylene-based resin foam sheets 失效
    制造未交联的聚丙烯类树脂发泡体片材和未交联的聚丙烯类树脂发泡体片材的方法

    公开(公告)号：US06290884B1

    公开(公告)日：2001-09-18

    申请号：US09363842

    申请日：1999-07-30

    申请人： Akinobu Sakamoto ,  Tatsuhiro Nagamatsu

    发明人： Akinobu Sakamoto ,  Tatsuhiro Nagamatsu

    IPC分类号： B28B150

    CPC分类号： B29C47/165 ,  B29C44/3442 ,  B29C44/60 ,  B29C47/0019 ,  B29C47/92 ,  B29C2947/92514 ,  B29C2947/92895

    摘要： The present invention provides a process for producing uncrosslinked polypropylene-based resin foam sheets which is characterized by using an extrusion foaming apparatus having a gear pump which is interposed between the extruder and the die and which is linked by means of adapters, wherein the pressure (Pg) at the inlet of the gear pump is within the range specified by the following formula (Formula 1) and the extruder is controlled so that the value of Pg is constant. Formula 1 Pc≦Pg(atm)≦Pc+90 Pc=(&khgr;−1)/H &khgr;: theoretical expansion ratio when the foaming agent added is 100% held H: coefficient of solubility of the foaming gas in the resin at the resin temperature in the gear pump inlet (cm3(STP)/cm3·atm) and the like. The present invention makes it possible to produce uncrosslinked polypropylene-based resin foam sheets having fine foam cells and good appearance and being excellent in productivity and extrusion stability as well as in productivity improving effect in the production of high-expansion thin sheets with reducing wavy or corrugated defects at ends of sheets.

    摘要翻译： 本发明提供了一种生产未交联的聚丙烯基树脂发泡片的方法，其特征在于使用具有齿轮泵的挤出发泡装置，所述挤出发泡装置介于挤出机和模头之间，并通过适配器连接，其中压力 齿轮泵入口处的Pg）在下式（式1）所规定的范围内，并且控制挤出机使得Pg的值是恒定的。当加入的发泡剂为100时，理论膨胀比为1 ％保持H：齿轮泵入口中树脂温度下发泡气体在树脂中的溶解度系数（cm3（STP）/ cm3））等。本发明使得可以生产未交联的聚丙烯类树脂发泡体 具有细泡沫单元和良好外观的片材，并且生产率和挤出稳定性以及生产率提高效果在高膨胀薄片w 减少片材端部的波纹或波纹缺陷。

    Polypropylene resin composition, polypropylene resin foamed material and process for producing the same
    5.
    发明授权
    Polypropylene resin composition, polypropylene resin foamed material and process for producing the same 失效
    聚丙烯树脂组合物，聚丙烯树脂发泡材料及其制造方法

    公开(公告)号：US5616627A

    公开(公告)日：1997-04-01

    申请号：US502880

    申请日：1995-07-17

    申请人： Tadashi Sakurai ,  Kouichirou Asao ,  Akinobu Sakamoto

    发明人： Tadashi Sakurai ,  Kouichirou Asao ,  Akinobu Sakamoto

    IPC分类号： C08J9/06 ,  C08J9/04 ,  C08J9/10 ,  C08L53/00

    CPC分类号： C08J9/103 ,  C08L53/00 ,  C08J2353/00

    摘要： The present invention relates to a polypropylene resin composition containing about 90 to 60 parts by weight of a polypropylene block copolymer (A); and about 10 to 40 parts by weight of a polyethylene resin (B), wherein the polypropylene block copolymer is a polypropylene block copolymer which contains about 99 to 90% by weight of a crystalline polypropylene (a) and about 1 to 10% by weight of an amorphous ethylene-.alpha.-olefin copolymer (b) and has a melt flow rate (MFR) of about 2 to 15 g/10 minutes, and a die swell ratio, measured by a capillary rheometer, of at least 1.7. Foamed materials containing a fine and uniform foam are obtainable from this composition.

    摘要翻译： 本发明涉及聚丙烯树脂组合物，其含有约90〜60重量份的聚丙烯嵌段共聚物（A）; 和约10至40重量份的聚乙烯树脂（B），其中聚丙烯嵌段共聚物是聚丙烯嵌段共聚物，其含有约99至90重量％的结晶聚丙烯（a）和约1至10重量％ 的无定形乙烯-α-烯烃共聚物（b），并且具有约2至15g / 10分钟的熔体流动速率（MFR）和通过毛细管流变仪测量的模头膨胀比为至少1.7。 含有细均匀泡沫的泡沫材料可从该组合物获得。