Vinylidene fluoride resin split yarn, process for production the

Details Vinylidene fluoride resin split yarn, process for production the Vinylidene fluoride resin split yarn, process for production the

1985-05-06

1986-06-03

Bell, James J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including interlaminar mechanical fastener

55DIG45, 428229, 428364, 428392, 428394, 428910, D03D 300

Patent

active

045929491

ABSTRACT:
A vinylidene fluoride resin having an inherent viscosity of 0.8 to 1.4 dl/g in dimethylformamide is melt-extruded and cooled and solidified under draft-stretching to form a film having a birefringence of 25.times.10.sup.-3 or larger. The film is heat-treated at 80.degree.-120.degree. 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 transition temperature, retains the charge semi-permanently. The charged split yarn is particularly suitable for forming a gas filter.

REFERENCES:
patent: 4298719 (1981-11-01), Mizuno et al.

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