Kureha Kagaku Kogyo Kabushiki Kaisha

Kureha Gosen Kabushiki Kaisha

Kureha Kagaku Kogyo Kabushiki

Yosio Sunaga

Hisaaki Ueba

Kazuaki Ohashi

Tosio Nagasima

Disclosure describes ball-like structures formed from bundled, crimped fibers rounded around a central portion thereof as a core, the core being formed with a molten-fused structure and having the following stipulations:

Ball-like structures and contacting materials for wastewater-treatment

Core materials for strings for musical instruments of a twist of two or more multifilaments composed of a vinylidene fluoride resin. The multifilament core has a diameter of 0.1 to 5 mm, an elongation of 10 to 50%, a tensile strength of at least 30 kg/mm.sup.2, a creep elongation of at most 15% and a Young's modulus of at least 200 kg/mm.sup.2. The multifilament is made of monofilaments each having a diameter of 1 to 300 .mu.m, a dispersion diameter of at most 20%/m, a specific gravity of at least 1.6, an inherent viscosity of 0.85 to 1.6 dl/g, an apparent viscosity of 12,000 to 100,000 poise and a birefringence of 30.times.10.sup.-3. Strings for violins, cellos and the like are made by tightly wrapping the core with a metal string.

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Tochigi, Japan

Yosio Sunaga