Jsp Corporation

Nobumasa Koshita

Masaharu Oikawa

Tatsuya Hayashi

Koki Nishijima

Shota Takagi

Hajime Ohta

Syouta Takagi

A modified expanded bead that includes an expanded bead which includes a specific base polymer (β) and a coating layer which includes a specific base polymer (α). The coating layer covers at least part of an outer surface of the expanded bead. The melting point Tα of the base polymer (α) and the melting point Tβ of the base polymer (β) satisfy a relationship of 0≤Tα−Tβ≤20. When the modified expanded bead is cut into two halves along a cutting plane to form two half portions and thereafter one of the two half portions is cut along planes perpendicular to the cutting plane to form ten small pieces, outermost pieces among the ten small pieces have a xylene-insoluble content (B) which is less than a xylene-insoluble content (A) in the half portion and the xylene-insoluble content (A) is 10-80% by mass.

Modified expanded bead and foam molded article of expanded beads

The present invention provides expanded beads of thermoplastic polyurethane, wherein the thermoplastic polyurethane constituting the expanded beads is an ether-based thermoplastic polyurethane, and a difference (T&#x2212;T) between a melting peak temperature (T) and a melting peak temperature (T) is from 0 to 8&#xb0; C., wherein the melting peak temperature (T) is a melting peak temperature at the time of first heating in a DSC curve obtained by heating the expanded beads from 20&#xb0; C. to 260&#xb0; C. at a heating rate of 10&#xb0; C./min, the melting peak temperature (T) is a melting peak temperature at the time of second heating in a DSC curve obtained by cooling from 260&#xb0; C. to 20&#xb0; C. at a cooling rate of 10&#xb0; C./min after the first heating and further heating again from 20&#xb0; C. to 260&#xb0; C. at a heating rate of 10&#xb0; C./min, and the DSC curves are obtained by the heat flux differential scanning calorimetry in conformity with JIS K7121-1987. The expanded beads of thermoplastic polyurethane not only have excellent surface appearance and fusion bonding properties but also have a low shrinkage factor.

Expanded thermoplastic polyurethane particles and expanded thermoplastic polyurethane particle molded article

The present invention relates to an expanded beads molded article, which is obtained through in-mold molding of expanded thermoplastic elastomer beads, has voids, and has a density of 150 to 300 kg/mand a voidage of 10 to 70% by volume.

Foaming particle molded body

The present invention is concerned with expanded beads of thermoplastic polyurethane in which a water-soluble anionic surfactant is attached at 50 mg/mto 1,000 mg/monto 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.

Thermoplastic polyurethane foamed particles and method for manufacturing thermoplastic polyurethane foamed particle molded article

Provided are expanded beads capable of providing an expanded thermoplastic polyurethane beads molded article which is excellent in physical properties, such as compression characteristics, repulsion elasticity, etc., and an expanded thermoplastic polyurethane beads molded article. Expanded beads of thermoplastic polyurethane, wherein a Shore A hardness of the thermoplastic polyurethane is 85 or more; an average cell diameter of the expanded beads is 50 to 300 &#x3bc;m; and a closed cell ratio when bisecting the expanded thermoplastic polyurethane bead is 60% or more; and an expanded thermoplastic polyurethane beads molded article obtained through in-mold molding of the same are disclosed.

Provided is an expanded propylene resin bead including a core layer in a foamed state, which includes a propylene-based resin composition (a) satisfying the following (i) and (ii); and a cover layer which includes an olefin-based resin (b) satisfying the following (iii) or (iv):

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Mibu-machi, Japan

Nobumasa Koshita