公开(公告)号：US20240018325A1

公开(公告)日：2024-01-18

申请号：US18349308

申请日：2023-07-10

Applicant: JSP CORPORATION

Inventor： Takumi SAKAMURA ,  Hajime OHTA

IPC: C08J9/228 ,  C08L23/14

CPC classification number: C08J9/228 ,  C08L23/14 ,  C08J2201/034 ,  C08J2323/14 ,  C08J2423/14

Abstract: A thermoplastic resin expanded bead and a molded article composed of the thermoplastic resin expanded beads are provided. The expanded bead includes a foam layer containing a thermoplastic resin. The expanded bead has a columnar shape, and has two or more and eight or less through-holes penetrating in the axial direction thereof. A ratio Ct/A of a total cross-sectional area Ct of the through-holes to a cross-sectional area A of the expanded bead in a cut surface obtained by cutting the expanded bead along a plane perpendicular to the axial direction at the center in the axial direction is 0.02 or more and 0.15 or less.

公开(公告)号：US20240279421A1

公开(公告)日：2024-08-22

申请号：US18569292

申请日：2022-06-17

Applicant: JSP CORPORATION

Inventor： Takumi SAKAMURA ,  Hajime OHTA

IPC: C08J9/228 ,  B29B9/12 ,  B29K23/00 ,  B29K105/04 ,  C08J9/18

CPC classification number: C08J9/228 ,  B29B9/12 ,  C08J9/18 ,  B29K2023/12 ,  B29K2105/046 ,  B29K2105/048 ,  B29K2995/0082 ,  C08J2205/052 ,  C08J2323/14

Abstract: A polypropylene-based resin expanded bead having a tubular shape with a through-hole, containing a foamed core layer constituted by a polypropylene-based resin and a fusion-bonding layer covering the foamed core layer. An average hole diameter d of the through-hole in 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, a mass ratio of the foamed core layer and the fusion-bondable layer is foamed core layer:fusion-bondable layer=99.5:0.5 to 85:15, and the polypropylene-based resin constituting the foamed core layer has a flexural modulus of 800 MPa or more and less than 1200 MPa and a melting point Tmc of 150° C. or lower.

公开(公告)号：US20230203263A1

公开(公告)日：2023-06-29

申请号：US17439258

申请日：2020-03-09

Applicant: JSP CORPORATION

Inventor： Takumi SAKAMURA ,  Naoki MOCHIDA ,  Akinobu HIRA

IPC: C08J9/18 ,  C08J9/12 ,  C08J9/228 ,  C08J9/00 ,  C08J3/22 ,  C08K3/38

CPC classification number: C08J9/18 ,  C08J9/122 ,  C08J9/228 ,  C08J9/0004 ,  C08J3/226 ,  C08K3/38 ,  C08J2323/14 ,  C08J2203/06 ,  C08J2203/22 ,  C08K2003/387 ,  B29C44/44

Abstract: A molded article of polyolefin-based resin expanded beads having excellent appearance and further suppressed color unevenness is provided.
Polyolefin-based resin expanded beads obtained by expanding polyolefin-based resin particles including one or two or more metal borates selected from zinc borate and magnesium borate, wherein the particles of the metal borate has an arithmetic average particle diameter based on the number of 1 μm or more, and a number rate of the particles of the metal borate having a particle diameter of 5 μm or more is 20% or less. A method for producing polyolefin-based resin expanded beads by releasing expandable polyolefin-based resin particles containing one or two or more metal borates selected from zinc borate and magnesium borate and a physical blowing agent dispersed in an aqueous medium in a closed vessel together with the aqueous medium from the closed vessel to a low pressure region than an inside of the closed vessel to expand the expandable polyolefin-based resin particles, the method comprising: using a metal borate having an arithmetic average particle diameter based on the number of 1 μm or more and a number rate of the particles having a particle diameter of 5 μm or more of 20% or less as the metal borate.

公开(公告)号：US20240301158A1

公开(公告)日：2024-09-12

申请号：US18549445

申请日：2022-03-11

Applicant: JSP CORPORATION

Inventor： Takumi SAKAMURA ,  Hajime OHTA

IPC: C08J9/18 ,  B29C44/02 ,  B29C44/34 ,  B29K23/00 ,  B29K105/00 ,  B29K105/04 ,  B29K105/16 ,  B29K507/04 ,  C08J3/12 ,  C08J9/00 ,  C08J9/12

CPC classification number: C08J9/18 ,  B29C44/3461 ,  C08J3/126 ,  C08J9/0066 ,  C08J9/122 ,  B29C44/02 ,  B29C44/3415 ,  B29K2023/12 ,  B29K2023/16 ,  B29K2105/0005 ,  B29K2105/0032 ,  B29K2105/0085 ,  B29K2105/046 ,  B29K2105/16 ,  B29K2105/251 ,  B29K2507/04 ,  B29K2995/0063 ,  C08J2323/16 ,  C08J2323/18

Abstract: A method for producing polypropylene-based resin (PPBR) expanded beads may include dispersing, first expanding, and second expanding. In the dispersing, resin particles are dispersed in a dispersion medium, the resin particles each including a core layer, containing carbon black blended into PPBR in a predetermined ratio, based on 100 parts by mass of PPBR, and a covering layer covering the core layer, containing carbon black blended into a polyolefin-based resin (POBR) in a predetermined ratio, based on 100 parts by mass of POBR. The first expanding expands the core layer of the resin particle to obtain a first expanded bead having a bulk ratio of 5 to 25 times. The second expanding expands the first expanded beads further to obtain second expanded beads. An M2/M1 ratio of a bulk ratio M2 of the second expanded beads to a bulk ratio M1 of the first expanded beads is 1.2 to 3.0.

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：US20240400782A1

公开(公告)日：2024-12-05

申请号：US18699674

申请日：2022-09-28

Applicant: JSP CORPORATION

Inventor： Takumi SAKAMURA ,  Hajime OHTA

IPC: C08J9/232 ,  C08J9/00 ,  C08J9/18 ,  C08K3/04

Abstract: A method for producing polypropylene-based resin expanded beads each having a through-hole by performing a first expanding step and a second expanding step is provided. In the first expanding step, tubular resin particles containing carbon black and having through-holes are dispersed in a dispersion medium and released to an environment under a low pressure, thereby obtaining first-step expanded beads having a bulk ratio of M1 times. In the second expanding step, the first-step expanded beads are further expanded to obtain polypropylene-based resin expanded beads having a bulk ratio of M2 times. The bulk ratio M1 is 5 times or more and 25 times or less. A ratio M2/M1 of the bulk ratio M2 to the bulk ratio M1 is 1.2 or more and 3.0 or less.

公开(公告)号：US20240124674A1

公开(公告)日：2024-04-18

申请号：US18392071

申请日：2023-12-21

Applicant: JSP CORPORATION

Inventor： Takumi SAKAMURA ,  Hajime OHTA

IPC: C08J9/228

CPC classification number: C08J9/228 ,  C08J2205/052 ,  C08J2323/16 ,  C08J2423/20

Abstract: A method for producing a molded article of expanded beads includes filling tubular polypropylene-based resin expanded beads each having a through-hole in a mold, and supplying a heating medium to fusion-bond the expanded beads to each other. The expanded beads have a foamed layer constituted by polypropylene-based resin. A closed cell of the expanded beads is 90% or more. An average hole diameter (d) of through-holes of the expanded beads is less than 1 mm. A ratio [d/D] of the average hole diameter (d) to an average outer diameter (D) of the expanded beads is 0.4 or less. An open cell content of the molded article of expanded beads is 2.5% or more and 12% or less.