Kuraray Co., Ltd.

Yunitika Ltd.

Tomoyasu Tsuda

Noriaki Yoshimura

Kazuhiko Tanaka

Masao Kawamoto

Koji Hirai

Yasuo Tokitoh

Yukiatsu Komiya

Kiyoshi Hirakawa

Takashi Hori

Kazunori Watanabe

A process for producing 7-octen-1-al by isomerization of 2,7.octadien-1-ol by feeding 2,7-octadien-1-ol and hydrogen to a reaction zone in the presence of a copper catalyst while controlling the molar ratio of 2,7-octadien-1-ol to hydrogen within a range of 99/1 to 75/25, and effecting isomerization in the gaseous phase. This process ensures a high yield, a high selectivity and stable operation over a long period of time.

Process for producing 7-octen-1-al

A process for producing octadienes comprises, on synthesis of octadienes by reacting butadiene with formic acid in the presence of a palladium catalyst, controlling the reaction pressure at not more than the vapor pressure of butadiene at the reaction temperature employed, thereby suppressing formation of byproducts which would accumulate in a catalyst-containing layer and minimizing the decrease of reaction rate and selectivity which would occur by such accumulation.

Process for producing octadienes

Fibers composed of a vinyl alcohol unit-containing polymer, or composite fibers, yarns or fiber products composed of the phase of the vinyl alcohol unit-containing polymer and the other fiber-forming polymer phase are acetalized with at least one of aldehyde compounds represented by the formulas,

Vinyl alcohol unit-containing polymer fibers having high moisture

Provided are a polyurethane comprising (A) a structural unit derived from polyester diol, which consists essentially of 1 to 3 members selected from the structural units (I), (II) and (III) shown below, and the structural units (IV) and (V) shown below, the molar fractions of these structural units satisfying specific relationships:

Polyurethane, process for its production and polyester diol used for its

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Kurashiki, Japan

Tomoyasu Tsuda