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    METHOD FOR PRODUCING POLYPROPYLENE-BASED RESIN EXPANDED BEADS
    2.
    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
    3.
    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
    6.
    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
    9.
    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.

    Skin material-coated foamed particle molded body
    10.
    发明授权
    Skin material-coated foamed particle molded body 有权

    公开(公告)号：US11529754B2

    公开(公告)日：2022-12-20

    申请号：US16494255

    申请日：2018-03-19

    Applicant: JSP CORPORATION

    Inventor： Tomoo Tokiwa ,  Hiroki Kawakami

    IPC: B29C44/14 ,  B29C44/44 ,  B32B5/24 ,  B32B27/12

    Abstract: A skin material-coated foamed particle molded body includes a skin material made of a polypropylene-based resin molded body and a polypropylene-based resin foamed particle molded body coated with the skin material. The skin material has a multilayer structure including an inner layer adhered to the foamed particle molded body and an outer layer outside the inner layer. The outer layer contains a polypropylene-based resin and a reinforcement fiber. The inner layer contains the polypropylene-based resin and a reinforcement fiber in a lower content ratio than a content ratio of the reinforcement fiber contained in the outer layer or contains the polypropylene-based resin and substantially no reinforcement fiber. An average value of the outer layer thickness ratio to a sum of the outer and inner layer thicknesses is 0.20 or more and 0.65 or less, and a coefficient of variation Cv of the ratio is 30% or less.

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