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    Production method of foamed polypropylene resin beads
    51.
    发明申请
    Production method of foamed polypropylene resin beads 有权
    发泡聚丙烯树脂珠的生产方法

    公开(公告)号：US20030034580A1

    公开(公告)日：2003-02-20

    申请号：US10163366

    申请日：2002-06-07

    Applicant: JSP CORPORATION

    Inventor： Hidehiro Sasaki ,  Kazuya Ogiyama ,  Akinobu Hira ,  Keiichi Hashimoto ,  Hiroki Yanagisawa ,  Hisao Tokoro

    IPC: B29C044/02

    CPC classification number: C08J9/18 ,  B29C44/445 ,  C08J2203/06 ,  C08J2323/12

    Abstract: A method for producing expanded polypropylene resin particles wherein polypropylene resin particles impregnated with a physical blowing agent are heated along with an aqueous medium and a dispersant and are released and expanded at reduced pressure from the interior of a pressure-tight vessel, wherein the aforementioned aqueous medium has an electrical conductivity of from not less than 0.00 ms/m to not more than 20.00 mS/m. The resulting particles obtained are without inconsistencies caused by differences in the amount of dispersant adhering to the particles or the amount of dispersant added to prevent the particles from fusing together during the heat treatment step of the method.

    Abstract translation: 一种生产发泡聚丙烯树脂颗粒的方法，其中浸渍有物理发泡剂的聚丙烯树脂颗粒与水性介质和分散剂一起加热，并在减压下从压力容器的内部释放和膨胀，其中上述水溶液 介质的导电率不小于0.00ms / m到不大于20.00mS / m。 获得的所得颗粒没有由附着于颗粒的分散剂的分散量的不均匀性或加入的分散剂的量而引起的不一致，以防止在该方法的热处理步骤期间颗粒熔合在一起。

    METHOD FOR PRODUCING POLYPROPYLENE-BASED RESIN EXPANDED BEADS
    53.
    发明申请
    METHOD FOR PRODUCING POLYPROPYLENE-BASED RESIN EXPANDED BEADS 有权

    公开(公告)号：US20250001657A1

    公开(公告)日：2025-01-02

    申请号：US18694740

    申请日：2022-08-16

    Applicant: JSP CORPORATION

    Inventor： Akinobu HIRA ,  Tokunobu NOHARA

    IPC: B29C44/34 ,  B29C44/02 ,  B29K23/00 ,  B29K105/04 ,  B29K507/04

    Abstract: A method for producing polypropylene-based resin expanded beads containing a post-consumer recycled material of a polypropylene-based resin foamed molded article containing carbon black in order to enable provision of a black expanded beads molded article excellent in appearance and physical properties using a post-consumer recycled material of a polypropylene-based resin foamed molded article containing carbon black. The method includes: a mixing step of melt-mixing a polypropylene-based resin at 230° C. under a load of 2.16 kg and a polypropylene-based resin recovered materials including of a recovered materials of a post-consumer recycled material of a polypropylene-based resin foamed molded article with an extruder to obtain a mixture; an extrusion step; and a foaming step, wherein in the mixture, the polypropylene-based resin recovered materials contains carbon black.

    POLYPROPYLENE RESIN FOAM PARTICLES
    54.
    发明申请
    POLYPROPYLENE RESIN FOAM PARTICLES 有权

    公开(公告)号：US20240409704A1

    公开(公告)日：2024-12-12

    申请号：US18700608

    申请日：2022-10-07

    Applicant: JSP Corporation

    Inventor： Yukiya SAITO ,  Hajime OHTA

    IPC: C08J9/18 ,  C08J9/00 ,  C08J9/12

    Abstract: A polypropylene-based resin expanded bead, in which the melting point Tma of a polypropylene-based resin (a) constituting a core layer in an expanded state is 135° C. or higher and 155° C. or lower; a polypropylene-based resin (b) constituting a covering layer contains a propylene-based copolymer containing a propylene component, an ethylene component, and a butene component, as a main component; the difference [Tma−Tmb] between the melting point Tma of the polypropylene-based resin (a) and the melting point Tmb of the polypropylene-based resin (b) is 1° C. or more and 30° C. or less; the difference [Tmb−Tcb] between the melting point Tmb of the polypropylene-based resin (b) and the crystallization temperature Tcb of the polypropylene-based resin (b) is 40° C. or less; and the covering layer contains a higher fatty acid amide.

    METHOD FOR PRODUCING POLYAMIDE-BASED RESIN MULTI-STAGE-EXPANDED BEADS
    57.
    发明公开
    METHOD FOR PRODUCING POLYAMIDE-BASED RESIN MULTI-STAGE-EXPANDED BEADS 审中-公开

    公开(公告)号：US20230407035A1

    公开(公告)日：2023-12-21

    申请号：US18030561

    申请日：2021-10-13

    Applicant: JSP CORPORATION

    Inventor： Tetsu OTSUKA

    IPC: C08J9/18 ,  C08J9/12 ,  C08J9/228

    CPC classification number: C08J9/18 ,  C08J9/228 ,  C08J9/12

    Abstract: A method for producing polyamide-based resin multi-stage expanded beads includes an internal pressure applying step of placing polyamide-based resin expanded beads in a pressure-resistant container, impregnating the polyamide-based resin expanded beads with a physical blowing agent in the pressure-resistant container to apply internal pressure higher than atmospheric pressure; and a heating and foaming step of heating and expanding the polyamide-based resin expanded beads to which internal pressure is applied obtained in the internal pressure applying step to obtain polyamide-based resin multi-stage expanded beads having apparent density lower than that of polyamide-based resin expanded beads used in the internal pressure applying step, in the internal pressure applying step, polyamide-based resin expanded beads in a wet state having a water content of 1% or more being impregnated with the physical blowing agent at a temperature higher than change-point temperature of storage modulus of the polyamide-based resin expanded beads in a wet state.

    POLYAMIDE-BASED RESIN EXPANDED BEADS, MOLDED ARTICLE OF POLYAMIDE-BASED RESIN EXPANDED BEADS, AND METHOD FOR PRODUCING POLYAMIDE-BASED RESIN EXPANDED BEADS
    60.
    发明申请
    POLYAMIDE-BASED RESIN EXPANDED BEADS, MOLDED ARTICLE OF POLYAMIDE-BASED RESIN EXPANDED BEADS, AND METHOD FOR PRODUCING POLYAMIDE-BASED RESIN EXPANDED BEADS 有权

    公开(公告)号：US20230053755A1

    公开(公告)日：2023-02-23

    申请号：US17794760

    申请日：2021-02-01

    Applicant: JSP CORPORATION

    Inventor： Tatsuya HAYASHI

    IPC: C08J9/16

    Abstract: Polyamide-based resin expanded beads contain a polyamide-based resin as a base material resin. The beads have a crystal structure, an intrinsic peak of the polyamide-based resin and a high-temperature peak having a peak top temperature on a higher temperature side than a peak top temperature of the intrinsic peak appear in a DSC curve obtained under a predetermined condition; an amount of heat of fusion of the high-temperature peak is within 5 J/g or more and 50 J/g or less; and a coefficient of variation of the amount of heat of fusion of the high-temperature peak is 20% or less. The beads are produced by in-mold molding. A method for producing the beads includes: impregnating a polyamide-based resin; and releasing expandable polyamide-based resin beads from a sealed container, a temperature in the sealed container is raised at a rate of 0.3° C. or higher and 1.5° C. or lower per 10 minutes.

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