Du Pont Toray Company Limited

Sanyo Chemical Industries, Ltd.

Toray Opelontex Co., Ltd.

Shingo Ito

Masao Umezawa

Toshikazu Matsuda

Toshihiro Tanaka

Hiroshi Takayama

Yusuke Koike

Shinpei Funaoka

Kenzo Hori

The present invention relates to a polyurethane resin including, as constituent units, a diol (a1) having a number average molecular weight of 500 to 10,000, an organic diisocyanate (b), and a chain extender (a2). The total concentration of urethane groups and urea groups in the polyurethane resin is 1.25 to 2.50 mmol/g based on the weight of the polyurethane resin. Hard segment domains of the polyurethane resin have an average domain size of 20 to 30 nm as measured with an atomic force microscope.

Polyurethane resin, polyurethane resin composition, and method for manufacturing polyurethane resin

Dry-spun polyurethane-based spandex &reg; containing 1-10 weight percent poly(vinylpyrrolidone) and a process of their preparation, are provided.

Process for the manufacture of spandex and the spandex made thereby

A viscosity-stable solution of a polyurethaneurea, in the substantial absence of viscosity stabilizers, and spandex dry-spun therefrom, prepared from certain polyether glycols and aliphatic diisocyanates and ethylene diamine, are provided.

Stable polyurethaneurea solutions

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Shiga, Japan

Shingo Ito