WATER-ABSORBABLE HIGH STRENGTH FIBER

Japanese Patent JPH01183515

A

PURPOSE:To provide the title novel fiber simultaneously provided with a strength required for a reinforcing fiber and a water-absorbing property, by comprising a hydrophilic crosslinked polymer in part of the outer layer portion of the fiber and an acrylonitrile polymer, etc., in the residue thereof and containing salt type carboxyl groups. CONSTITUTION:The objective fiber comprises a hydrophilic crosslinked polymer in at least part of the outer layer portion of the fiber and an acrylonitrile polymer (hereinafter referred to as AN) and/or other polymers in the residue thereof, is combined with salt type carboxyl groups of the formula -COOX (X is alkali metal or NH4) in an amount of >=0.1mmol./g and has a strength of >=5g/d. The fiber is preferably produced by a method wherein an AN series high strength fiber is subjected to a hydrolysis treatment using an alkali metal hydroxide aqueous solution having a high concentration of >=9mol./1,000g solution at 100-130 deg.C for 10-30min, etc. The aforementioned AN series high strength fiber is preferably that having a weight retaining rate of >=90% when subjected to a boiling water treatment in a 2N caustic soda aqueous solution for 10min.

UCHIDA SHOKI
ONO HIROSHI
ASHIDA MAMORU

JP33500987A

July 21, 1989

December 30, 1987

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JAPAN EXLAN CO LTD

D06M11/00; D01F6/18; D01F6/38; D06M11/38; H01B7/28; H01B7/282; D06M101/00; D06M101/16; D06M101/18; D06M101/28; (IPC1-7): D01F6/18; D01F6/38; D06M3/18; H01B7/28

JPS6260503A	1987-03-17
JPS5777313A	1982-05-14
JPS5777312A	1982-05-14
JPS6233817A	1987-02-13

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