Jsp Corporation

Tatsuya Hayashi

Masaharu Oikawa

Nobumasa Koshita

Akinobu Hira

Koki Nishijima

A polyamide-based resin expanded bead comprising a foam layer formed by expanding a polyamide-based resin, wherein on a first DSC curve and a second DSC curve, the first DSC curve has a melting peak (intrinsic peak) having a peak top temperature on a low temperature side equal to or lower than a peak top temperature of a melting peak of the second DSC curve and a melting peak (high temperature peak) having a peak top temperature on a high temperature side exceeding the peak top temperature of the second DSC curve, and, the peak top temperature of the melting peak of the second DSC curve is 180° C. or higher and 280° C. or lower, and the polyamide-based resin expanded bead has an apparent density of 10 to 300 kg/mand a closed cell ratio of 85% or more.

Polyamide resin foamed particles and method for producing same

The polyamide-based resin expanded beads are expanded beads including a polyamide-based resin as a base resin, in which the average value of bead weight of the expanded beads is 0.5 mg or more and 8 mg or less, the coefficient of variation of the bead weight of the expanded beads is 10% or less, and the average value of the ratio of a long diameter to a short diameter (a long diameter/a short diameter) of the expanded beads measured with a projection image photographing type bead size distribution analyzer is 1 or more and 1.5 or less, the coefficient of variation of the ratio (a long diameter/a short diameter) is 12% or less, the average value of the a short diameter is 1 mm or more and 4 mm or less, and the coefficient of variation of the a short diameter is 10% or less.

Polyamide-based resin expanded beads and molded article of polyamide-based resin expanded beads

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

Polyamide-based resin 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.

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Yokkaichi, Japan

Tatsuya Hayashi