Kuraray Co., Ltd.

Mitsuro Mayahara

Tomoyuki Sano

Akio Mizobe

Masaki Okazaki

Hirofumi Sano

Junichi Yoshinaka

Yoshinori Hitomi

Yusuke Ando

Akira Shimizu

Hiroshi Sumura

Polyvinyl alcohol-based fiber having excellent hot water resistance and

A synthetic fiber suited for use as a reinforcement for cement mortar or concrete as derived from monofilaments having a tensile strength of not less than 80 kg/mm.sup.2, Young's modulus of not less than 2,300 kg/mm.sup.2, a flat cross section in which the minor axis-to-major axis ratio is 1:2 to 1:10, and a fineness of 1,000-9,000 denier, and being cut to a fiber length such that the aspect ratio (the value obtained by dividing the fiber length by the diameter of a circle equivalent in area to the cross section of the fiber) amounts to 20-150, in particular a polyvinyl alcohol fiber having the above-mentioned characteristic features, shows good dispersibility in cement mortar and produces very good reinforcing effect. Materials of construction which are excellent in workability and postcure strength can be obtained by incorporating the above-mentioned fiber to cement and the like.

Synthetic fiber for use in reinforcing cement mortar or concrete and

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Okayama, Japan

Mitsuro Mayahara