TECHNOLOGY FOCUS - TEXTILES AND PAPER - Preferred Materials: The separator contains 15-60 wt.% of SCF and 20-60 wt.% of PCF. The separator further contains less than 40 wt.% of other synthetic fiber having fiber length of 3-25 mm. The nonwoven fabric is a composite of laminate of fiber webs with differing fiber lengths. The separator is a composite sheet of nonwoven fabric laminated with other sheets on at least one part of nonwoven fabric. The PCF is a core sheath type composite fiber containing high density polyethylene as sheath component and polypropylene as core component.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The polyolefin type polymer (II) is polypropylene group polymer.    TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Process: The thermobonding of low melting component of PCF is carried out with SCF. The hydrophilization treatment is carried out by sulfonation process using fuming sulfuric acid, chloro sulfonic acid or sulfuric anhydride. The degree of sulfonation is 0.4-2 wt.%. EXAMPLE - SCF of 45 mm fiber length was obtained using methyl pentene copolymer (melting point 240degreesC) and polypropylene (163degreesC) in the ratio of 50:50. PCF was obtained using low density polyethylene (105degreesC) as sheath and polypropylene (163degreesC) as core in the ratio of 50:50. 40 wt.% of PCF was mixed with 20 wt.% of SCF and with 40 wt.% of polypropylene fiber (163degreesC) having fiber length of 51 mm. A fiber web of fabric weight 30 g/m2 was produced. High pressure was applied and SCF was divided into extra fine fiber. The obtained fabric was thermobonded and composite nonwoven fabric was obtained. The fabric was neutralized using mixture containing 50 wt.% chlorosulfonic acid and 50 wt.% of concentrated sulfuric acid. The fabric was washed in water and dried. After heat calender process, separator with thickness 0.15 mm was obtained. The tensile strength of the separator was 110 N/5 cm as determined by JIS L 1096. A test piece of separator was immersed in potassium hydroxide solution for 1 hour and liquid retaining ratio was determined and was found to be 200%. The separator was provided to a nickel-hydrogen battery. The capacitative rate of preservation was 77% and cycle life was 785.