公开(公告)号：US20230075291A1

公开(公告)日：2023-03-09

申请号：US17760410

申请日：2021-02-17

Applicant: JSP CORPORATION

Inventor： Yohei KANEKO ,  Kenji HARAGUCHI

IPC: C08F220/18 ,  C08F212/08 ,  C08F2/32 ,  C08F218/04 ,  C08J9/22

Abstract: A HIPE foam may including a vinyl-based crosslinked polymer as a base material resin. The vinyl-based crosslinked polymer may be formed by crosslinking a polymer of a styrene-based monomer and/or an acryl-based monomer. An apparent density ρ of the HIPE foam may be 35 kg/m3 or more and 500 kg/m3 or less. A molecular weight between crosslinking points of the vinyl-based crosslinked polymer forming the HIPE foam may be 2×103 or more and 2×105 or less. The HIPE foam may be used as, for example, a machinable material or an impact absorbing material.

公开(公告)号：US11560458B2

公开(公告)日：2023-01-24

申请号：US17171732

申请日：2021-02-09

Applicant: JSP Corporation

Inventor： Tatsuya Hayashi

IPC: C08J9/18

Abstract: Polyamide-based resin expanded beads having a crystallite size of more than 8 nm as measured by X-ray diffraction method are provided.

公开(公告)号：US20220267552A1

公开(公告)日：2022-08-25

申请号：US17591725

申请日：2022-02-03

Applicant: JSP CORPORATION

Inventor： Takumi SAKAMURA ,  Hajime OHTA

IPC: C08J9/18 ,  C08J9/00 ,  C08J9/12 ,  B29C44/34

Abstract: An expanded bead having a tubular shape with a through hole and a method for producing the same are provided. The expanded bead includes a foamed core layer and a covering layer. A polyolefin-based resin included in the covering layer has a melting point lower than a melting point of a polypropylene-based resin included in the foamed core layer. An average hole diameter d of the through hole of the expanded bead is less than 1 mm, and a ratio d/D of the average hole diameter d to an average outer diameter D of the expanded bead is 0.4 or less. The polypropylene-based resin for the foamed core layer has a flexural modulus of 1,200 MPa or more and a melting point of 158° C. or lower.

公开(公告)号：US11225562B2

公开(公告)日：2022-01-18

申请号：US16333479

申请日：2017-09-15

Applicant: JSP Corporation

Inventor： Shota Takagi ,  Masaharu Oikawa

IPC: C08J9/18 ,  B29C44/34 ,  B29C44/44 ,  B29K23/00 ,  C08K5/00

Abstract: The present invention provides expanded beads comprising a crosslinked multi-block copolymer containing an ethylene block and an ethylene-α-olefin copolymer block, having an apparent density of 40 to 300 g/L, a gel fraction of 30 to 70% by weight by a hot xylene extraction method, an average cell diameter (a) of 50 to 180 μm, and an average surface layer thickness (b) of 3 to 27 μm, and the expanded beads are excellent in in-mold moldability, and can produce an expanded beads molded article being excellent in tensile characteristics in a well balanced manner.

公开(公告)号：US11174365B2

公开(公告)日：2021-11-16

申请号：US16344891

申请日：2017-11-02

Applicant: JSP Corporation

Inventor： Shota Takagi ,  Masaharu Oikawa

IPC: C08J9/232 ,  C08J3/20 ,  C08J9/18 ,  C08J9/16 ,  B29B9/12 ,  B29B7/00 ,  B29B9/06 ,  B29C44/34 ,  B29K23/00 ,  B29K96/04 ,  B29K105/00 ,  B29K105/04 ,  B29K105/24 ,  B29B7/38 ,  B29C44/00

Abstract: The present invention is concerned with expanded beads of a block copolymer of a polyethylene block and an ethylene/α-olefin copolymer block, wherein a xylene insoluble fraction (A) of the expanded beads by a hot xylene extraction method is 10 to 70% by weight, and a ratio (A/B) of the xylene insoluble fraction (A) to a xylene insoluble fraction (B) of the expanded beads by a hot xylene extraction method when divided into two equal parts and measured is 1.0 to 1.1, and is able to provide expanded beads with excellent in-mold moldability and an expanded beads molded article with excellent fusion bondability and restorability.

公开(公告)号：US20210309843A1

公开(公告)日：2021-10-07

申请号：US17274530

申请日：2018-09-21

Applicant: JSP CORPORATION

Inventor： Masahiro GOMIBUCHI ,  Jinichiro NORO

IPC: C08L23/14 ,  C08J9/12

Abstract: A method for producing a polypropylene-based resin foamed molded article by blow molding a foamed parison formed of a base resin, in which: the base resin contains, in specific mixing proportions, a branched polypropylene-based resin (A), a linear polypropylene-based resin (B) and a recovered raw material (C) that is recovered in the course of production of the polypropylene-based resin foamed molded article. Each of the resin (A), resin (B) and the recovered raw material (C), has a specific range of a melt tension and a melt flow rate. A difference in melting point between the resin (A) and resin (B) is within a specific range. A difference in crystallization temperature between the resin (A) and resin (B) is within a specific range.

公开(公告)号：US20210060833A1

公开(公告)日：2021-03-04

申请号：US16348355

申请日：2017-11-08

Applicant: JSP Corporation

Inventor： Shota TAKAGI ,  Masaharu OIKAWA

IPC: B29C44/44 ,  C08J9/18 ,  C08J9/232

Abstract: An expanded beads molded article containing a block copolymer of a polyethylene block and an ethylene-α-olefin copolymer block and having a density of 150 kg/m3 or more and 500 kg/m3 or less and a tensile strength of 0.5 MPa or more.

公开(公告)号：US20200282695A1

公开(公告)日：2020-09-10

申请号：US16645420

申请日：2018-09-14

Applicant: JSP CORPORATION

Inventor： Tomoo TOKIWA

IPC: B32B5/24 ,  B29B11/06 ,  B29B11/16 ,  B29C44/44 ,  B29C44/14 ,  B32B27/32 ,  B32B27/20 ,  C08J9/228 ,  C08J9/00

Abstract: A skin-covered foamed molded article having excellent lightweight property, bending rigidity, and favorable dimensional stability, which includes: a skin material composed of a hollow molded body produced by blow-molding an extruded parison; and an expanded bead molded article located inside the skin material, wherein the skin material has an average wall thickness of from 1.0 mm to 5.0 mm, the skin material includes a glass fiber-reinforced polypropylene-based resin containing glass fiber in a range of from 5 mass % to 30 mass %, the glass fiber has a weight-average fiber length of from 0.4 mm to 1.5 mm, the expanded bead molded article includes a polypropylene-based resin, the peeling strength between the skin material and the expanded bead molded article is 0.1 MPa or higher, and the longitudinal linear expansion coefficient of the skin-covered foamed molded article (100) at from 23° C. to 80° C. is 7×10−5/° C. or lower.

公开(公告)号：US10766166B2

公开(公告)日：2020-09-08

申请号：US14792763

申请日：2015-07-07

Applicant: JSP CORPORATION

Inventor： Tomoo Tokiwa

IPC: B29C44/44 ,  B29B11/14 ,  B29C44/34 ,  B29C44/14 ,  C08J9/12 ,  C08J9/18 ,  C08J9/232 ,  B29K23/00 ,  B29K105/04 ,  B29L9/00 ,  B29C51/02 ,  B29C48/08 ,  B29C48/345 ,  B29C48/30 ,  B29C48/05 ,  B29C48/00

Abstract: A method for producing a skin-covered molded article including filling polypropylene-based resin expanded beads in a hollow space of a thermoplastic resin skin and feeding steam into the hollow space to fusion-bond the expanded beads together, the expanded beads showing specific DSC characteristics involving a specific high temperature peak(s) with specific heat of fusion.

公开(公告)号：USRE48098E1

公开(公告)日：2020-07-14

申请号：US16263547

申请日：2019-01-31

Applicant: JSP CORPORATION

Inventor： Takuya Chiba ,  Masaharu Oikawa

IPC: C08J9/16 ,  B29B9/06 ,  B29C44/02 ,  B29C44/34 ,  C08J9/00 ,  C08J9/12 ,  C08J9/228 ,  C08J9/232 ,  B32B5/18 ,  B32B27/18 ,  C08J9/18 ,  C08J9/22 ,  B29K105/12 ,  B29K509/00

Abstract: Thermoplastic resin foamed particles of the present invention including more than one or more functional additive selected from inorganic powder and inorganic fibers each includes a core layer formed of a thermoplastic resin and a coating layer in a foamed state formed of a thermoplastic resin, the mass ratio of the coating layer to the core layer is 99:1 to 50:50, the content (X) of the functional additive in the core layer is 5 to 90% by mass, and the content of the functional additive in the coating layer is smaller than the content (X) of the functional additive in the core layer. By this way, thermoplastic resin foamed particles from which a homogeneous foamed particle molding having excellent dimension stability, fusibility and appearance can be obtained while containing functional additive are provided.