Kuraray Co., Ltd.

Hirofumi Sano

Akio Ohmory

Tomoyuki Sano

Akitsugu Akiyama

Toshiaki Sato

Hiroshi Narukawa

Hayami Yoshimochi

Syunpei Naramura

Yoshiharu Fukunishi

Mitsuro Mayahara

Akira Shimizu

Yoshinori Hitomi

Yusuke Ando

Hiroshi Sumura

Polyvinyl alcohol-based fiber having excellent hot water resistance and

Provided are high-performance polyvinyl alcohol fibers having excellent resistances to hot water and dry heat as well as excellent strength and elastic modulus. The fibers are produced from a highly syndiotactic polyvinyl alcohol containing units from vinyl pivalate in an appropriate amount, which renders it possible to draw the highly crystalline fiber in a high drawing ratio of at least 16.

Polyvinyl alcohol fiber

High-strength polyvinyl alcohol fiber is provided by extruding a polyvinyl alcohol dope solution through a spinneret into a coagulating bath, the spinneret being located such that substantially only its dope-extruding surface contacts the coagulating bath. This process can produce stably and at a low cost polyvinyl alcohol fibers with excellent strength.

Process of making high-strength polyvinyl alcohol fiber

Provided are a polyvinyl alcohol fiber having a specific higher order structure, obtained by having the orientation and arrangement of molecular chains forming the fiber which comprises a crystalline region and an amorphous region lie in specific ranges to thereby making the fiber have a break-ing temperature in hot water of at least 125.degree. C., or further at least 130.degree. C. and be excellent in abrasion resistance, while maintaining the tenacity and the modulus of the fiber at high levels; and a process for producing the same.

Polyvinyl alcohol fiber having excellent resistance to hot water and

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Kurashiki, Japan

Hirofumi Sano