Invista North America S.a.r.l.

Sanyo Chemical Industries, Ltd.

Toray Opelontex Co., Ltd.

The Lycra Company UK Limited

Hiroshi Takayama

Toshihiro Tanaka

Hong Liu

Masashi Hara

Shingo Ito

Yusuke Koike

Shinpei Funaoka

Kenzo Hori

[Problem] To provide a polyurethane elastic yarn which has the high strength and ductility sought in polyurethane elastic yarn, and also has excellent durability and heat resistance, as well as little fatigue at low temperature; and a production method thereof. [Means of Resolution] A polyurethane elastic yarn made from polyurethane which has polymer diol and diisocyanate as starting substances, wherein said polyurethane comprises a polyurethane A containing a polybutadiene structure in which the proportion of 1,2-bonded butadiene structure to 1,4-bonded butadiene structure in the molecule is in the range from 91:9 to 20:80.

Polyurethane elastic yarn and production method thereof

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

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Shiga, Japan

Hiroshi Takayama