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.

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.

公开(公告)号：US11466137B2

公开(公告)日：2022-10-11

申请号：US16348108

申请日：2017-11-07

Applicant: JSP Corporation

Inventor： Shota Takagi ,  Masaharu Oikawa

IPC: C08J9/228 ,  C08J9/18 ,  C08K3/04 ,  C08K5/3417 ,  C08J9/16

Abstract: The present invention is concerned with expanded beads that are olefin-based thermoplastic elastomer expanded beads containing a coloring agent, wherein an apparent density of the expanded beads is 40 to 300 g/L, and an average surface layer membrane thickness (a) is 3 to 25 μm, and a molded article thereof, and is able to provide expanded beads capable of producing an expanded beads molded article which is excellent in in-mold moldability and excellent in tensile characteristics and an expanded beads molded article using the expanded beads.

公开(公告)号：US11420365B2

公开(公告)日：2022-08-23

申请号：US16469009

申请日：2017-12-21

Applicant: JSP CORPORATION

Inventor： Hiroki Kawakami ,  Tomoo Tokiwa

IPC: B29C44/18 ,  C08J9/236 ,  C08L23/16 ,  B29B11/06 ,  C08J9/232 ,  B29K23/00 ,  B29K105/04

Abstract: A method for producing a foamed particle molded article provided with a skin, includes: forming a hollow molded article; filling a hollow part of the hollow molded article with polypropylene-based resin foamed particles; and heating and fusing the particles to each other. A melt elongation at 190° C. of the polypropylene-based resin forming the hollow molded article is 100 m/min or more. A half-crystallization time at 100° C. of the polypropylene-based resin is between 25 to 80 seconds. In heat flux differential scanning calorimetry, a melting peak temperature of the polypropylene-based resin is between 130 to 155° C., a partial heat of fusion at 140° C. or more of the polypropylene-based resin is between 20 to 50 J/g, and a ratio of the partial heat of fusion of the polypropylene-based resin to the total (partial heat of fusion/total heat of fusion) is between 0.2 to 0.8.

公开(公告)号：US20220235216A1

公开(公告)日：2022-07-28

申请号：US17610659

申请日：2020-04-23

Applicant: JSP Corporation

Inventor： Shota TAKAGI ,  Akinobu HIRA

IPC: C08L53/00

Abstract: The present invention relates to cylindrical expanded thermoplastic elastomer beads provided with through-holes, the expanded thermoplastic elastomer beads including a core layer in an foamed state constituted of a base polymer containing a thermoplastic elastomer and a cover layer covering the core layer and constituted of a thermoplastic polymer, wherein a coefficient of dynamic friction of the thermoplastic polymer is 0.8 or less, and a difference between a melting point (Tmc) of the base polymer and a melting point (Tms) of the thermoplastic polymer is −20° C. or more and 20° C. or less. The present invention also relates to an expanded thermoplastic elastomer beads molded article formed by subjecting expanded thermoplastic elastomer beads provided with through-holes to in-mold molding, the molded article including a core layer in a foamed state and a cover layer covering the core layer, wherein a voidage is 15% or more, a density is 10 kg/m3 or more and 200 kg/m3 or less, and the product of a tensile strength (MPa) and a tensile elongation (%) is 5 or more.

公开(公告)号：US11254774B2

公开(公告)日：2022-02-22

申请号：US16631415

申请日：2018-07-20

Applicant: JSP Corporation

Inventor： Kenji Haraguchi ,  Jumpei Goto

IPC: C08F257/02

Abstract: The present invention relates to a styrene-based resin having a weight average molecular weight Mw′ as determined by the GPC-MALS method of 1,000,000 or more and 5,000,000 or less, a degree of long-chain branching of 0.2 or more per 1,000 styrene units, and a tetrahydrofuran-insoluble matter of 0.1% by weight or less (including 0), the styrene-based resin being free from a component derived from a polyfunctional monomer in a molecular chain thereof. In a method for producing this styrene-based resin, in an impregnation step of adding a polymerization initiator and a styrene monomer in an aqueous medium, thereby impregnating the polymerization initiator and the styrene monomer in the seed particle at a temperature at which polymerization of the styrene monomer does not substantially proceed, the amount of the styrene monomer is 20 to 200 parts by weight based on 100 parts by weight of the seed particle; and in an additional impregnation polymerization step of graft polymerizing the styrene monomer on the styrene-based resin, the addition amount of the styrene monomer is 50 to 700 parts by weight based on 100 parts by weight of the seed particle, and the content of the styrene monomer in the seed particle is held at 10% by weight or less.

公开(公告)号：US20220016873A1

公开(公告)日：2022-01-20

申请号：US17490175

申请日：2021-09-30

Applicant: JSP CORPORATION

Inventor： Ryuichi TANIGUCHI ,  Hirotoshi KAKUTA ,  Takashi ORI

IPC: B32B27/06 ,  B29C48/00 ,  B29C48/07 ,  B29C48/21 ,  B32B5/18 ,  B32B27/32

Abstract: A laminated foam sheet having a polyethylene resin foam layer and an antistatic polyethylene layer laminated on one or both sides thereof is produced by coextruding melts for respective layers, wherein the melt for the antistatic layer contains a polyethylene resin, an ionomer resin antistatic agent and a specific amount of volatile plasticizer blend containing an alcohol and a saturated hydrocarbon or a dialkyl ether. The antistatic layer of the obtained laminated foam sheet has specific morphology.

公开(公告)号：US11052800B2

公开(公告)日：2021-07-06

申请号：US16486269

申请日：2018-02-15

Applicant: JSP CORPORATION

Inventor： Atsuo Takayama ,  Keiichi Hashimoto ,  Katsunori Hisamatsu

IPC: B60N2/70

Abstract: A seat core material of the present invention is a seat core material for vehicle including a thermoplastic resin expanded bead article and a frame member embedded in a peripheral edge portion of the expanded bead article. The frame member includes a front frame part, a rear frame part, and two side frame parts interconnecting the front frame part and the rear frame part. Slits crossing the two side frame parts are formed along a longitudinal direction with continuous parts left intact outside the side frame parts on both ends of the expanded bead article. The slit penetrates or does not penetrate the expanded bead article in a thickness direction. The continuous parts are formed in a curved shape or a bent shape.

公开(公告)号：US10899904B2

公开(公告)日：2021-01-26

申请号：US16088746

申请日：2017-02-03

Applicant: JSP Corporation

Inventor： Masaharu Oikawa ,  Koki Nishijima ,  Nobumasa Koshita ,  Tatsuya Hayashi

IPC: C08J9/236 ,  C08J9/224 ,  C08J9/18 ,  B29C44/34 ,  C08J9/232 ,  B29C44/02 ,  B29C44/44 ,  C08J9/20 ,  B29K75/00

Abstract: The present invention is concerned with expanded beads of thermoplastic polyurethane in which a water-soluble anionic surfactant is attached at 50 mg/m2 to 1,000 mg/m2 onto the surfaces of expanded beads of thermoplastic polyurethane having a dispersant attached thereto; and a method for producing an expanded beads molded article, including filling the expanded beads of thermoplastic polyurethane in a mold for molding and heating with a water vapor to mutually fuse the expanded beads with each other. The present invention provides expanded beads from which an expanded TPU beads molded article having excellent tensile strength and a method for producing an expanded TPU beads molded article.

公开(公告)号：US20200269542A1

公开(公告)日：2020-08-27

申请号：US16731302

申请日：2019-12-31

Applicant: JSP CORPORATION

Inventor： Ryuichi TANIGUCHI ,  Hirotoshi KAKUTA

IPC: B32B5/18 ,  B32B27/32 ,  B32B27/08

Abstract: A laminated foam sheet having a polyethylene resin foam layer and an outer layer laminated on each side of the foam layer, each outer layer being composed of an outermost surface polyethylene resin layer and an intermediate polyethylene resin layer which is positioned between the outermost surface layer and the foam layer and which contains a specific amount of a polymeric antistatic agent relative to the weight of the intermediate layer and to the basis weight of each of the intermediate layer and outermost surface layer.