PURPOSE: To obtain film having high permeation rate and separation factor affording high separation performance by a nonporous layer by forming film by extruding molten thermoplastic crystalline polymer, stretching the obtd. film and subjecting closed cells or semiopen pored generated in the film to plasma treatment.
CONSTITUTION: Hollow yarn is melt-spun at Tm+10WTm+50°C wherein Tm is melting point of a thermoplastic crystalline polymer. Suitable draft for melt spinning is 5W10,000. Suitable cooling temp. is Tg-50WTm-50°C (wherein Tg is glass transition temp. of the polymer. The cooled product is pref. heat- treated further under tension at 1W3 draw ratio at Tg+20WTm-5°C. Then, porous tissue is formed by the heat-treatment at Tg-50WTm-10°C and drawing with 1.05W3 draw ratio. It is pref. that stretching with 1.1W5 draw ratio is executed further at below Tm-5°C. Obtd. hollow yarn is subjected to plasma treatment by applying glow discharge. It is not necessary to afford thin film forming ability to the gas to be supplied.
MURATA KAZUTAKA
ANAZAWA TAKANORI
ONO YOSHIYUKI
| JPS59229320A | 1984-12-22 | |||
| JPS4716574A | ||||
| JPS5955309A | 1984-03-30 |
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