Kuraray Co., Ltd.

Setuo Yamashita

Koji Hirai

Yukiatsu Komiya

Takuji Okaya

Katsura Maeda

Masao Ishida

Shinji Komori

Michihiro Ishiguro

Tatuya Oshita

Elastic polyurethane fiber

Novel polyamide copolymers having skeletons of a specific structure are disclosed. The polyamide copolymers have excellent resistance to hydrolysis, low temperature characteristics (low temperature softness), heat aging resistance and mechanical properties as compared to conventional polyamide copolymers. The polyamide copolymers also show excellent efficiencies in fabrication properties and transparency. In particular, the polyamide copolymers having a branched structure in the molecule thereof provide good results.

Polyamide copolymers

The present invention is directed to an elastic polyurethane obtained by copolymerization of a polymer diol of a polyesterpolycarbonate diol utilizing a long-chain diol having methyl branches or a mixed diol of a polyester diol and a polycarbonate diol, with an organic diisocyanate and a chain extender. Elastic fibers obtained by spinning said polyurethane have low tensile stress at low tensile strain zone and high tensile stress at high tensile strain zone.

Polyurethane, elastic polyurethane fiber and polyesterpolycarbonatediol

Provided is an elastic polyurethane fiber having excellent hot water resistance, elastic recovery at low temperatures and elongation, prepared from a polyurethane obtained by copolymerization of a high polymer diol obtained from 3-methyl-1,5-pentanediol and an aliphatic dicarboxylic acid, an organic diisocyanate and a chain extender.

Polyester urethane fiber: polyester made from methyl pentane diol

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Kurashiki, Japan

Setuo Yamashita