Toyota Jidosha Kabushiki Kaisha

Sumitomo Bayer Urethane Co., Ltd.

Yuji Hoshino

Takashi Ohta

Norio Sato

Mitsumasa Matsushita

Takumi Taniguchi

Kanemitsu Kondo

Naruaki Abe

Hiroshi Ikuta

Takaaki Masuda

Hisao Mitobe

A composite resin material exhibiting excellent physical properties, which is formed by adding semi-rigid or rigid polyurethane resin waste to a thermoplastic reactive resin, a nonreactive resin, a polymer alloy or the like. A first kind of the composite resin material is composed of a crosslinking polyurethane resin and a reactive resin, a nonreactive resin or a polymer alloy, which is formed by kneading the crosslinking polyurethane resin and the reactive resin, the nonreactive resin or the polymer alloy at a predetermined temperature or more. A second kind of the composite resin material is composed of a hydrolysis product of crosslinking polyurethane resin and a solid filler, which are mixed with a nonreactive resin and a polymer alloy by kneading. A third kind of the composite resin material is formed by kneading a moisture-absorbing crosslinking polyurethane resin, a reactive resin and one of a reactive resin, a nonreactive resin and a polymer alloy composed of a resilient rubber material and a thermoplastic resin at a temperature of not less than the hydrolysis temperature of the crosslinking polyurethane resin and not less than the melting point of the one of the nonreactive resin and the polymer alloy.

Composite resin material and method of forming the same

A cross-linked polyurethane resin powder includes a powder including particles made from a hard or a semi-hard polyurethane resin. The particles have a superficial portion and an internal portion disposed inside the superficial portion, and involve cross-linked bondings therein. Part of the cross-linked bondings are unchanged, and another part thereof are broken to result in activated groups. At least part of the activated groups are exposed on the superficial portion of the particles. The cross-linked polyurethane resin powder is produced by hydrolyzing a hard or semi-hard polyurethane resin in the presence of water and in a temperature range of from a hydrolysis temperature of the resin to a liquefying temperature thereof, and by applying a predetermined shearing force to the resin. The cross-linked polyurethane resin powder can disperse well in resinous substrates, and can upgrade the physical properties of the resulting recycled products.

Cross-linked polyurethane resin powder and process for producing the same

Method for decomposing polymer containing urethane linkage and/or

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Nagoya, Japan

Yuji Hoshino