Vinylidene fluoride resin split yarn, process for production...

D - Textiles – Paper – 01 – D

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D01D 5/42 (2006.01) A24D 3/08 (2006.01) B01D 39/04 (2006.01) B01D 39/08 (2006.01) C08J 5/18 (2006.01) D01F 6/12 (2006.01)

Patent

CA 1243159

ABSTRACT OF THE DISCLOSURE A vinylidene fluoride resin having an inherent viscosity of 0.8 to 1.4 dl/g in dimethyl- formamide is melt-extruded and cooled and solidified under draft-stretching to form a film having a bi- refringence of 25 x 10-3 or larger. The film is heat- treated at 80 - 120 °C and split into a split yarn. The split yarn has a Young's modulus even higher than that of the polypropylene split yarn and, when provided with a surface charge above the glass transi- tion temperature, retains the charge semi-permanently. The charged split yarn is particularly suitable for forming a gas filter.

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