HIGH STRENGTH POLYETHYLENE FIBER AND NON-WOVEN FABRIC FOR ELECTRIC CELL SEPARATOR, AND IMPACT-RESISTANT MEMBER

摘要

A high strength polyethylene fiber which comprises, as the main component thereof, a high molecular polyethylene comprising ethylene-derived recurring units and having a limitting viscosity [ eta ] of 5 or more, exhibits molecular orientation, has an average single fiber fineness of 0.66 dtex or less, has at least two heat absorption peaks at temperatures of 140 DEG C or higher as measured by means of a differential scanning calorimeter (DSC), with the proviso that an absorption peak having the highest temperature is present above 150 DEG C; a non-woven fabric which partly comprises the polyethylene fiber; a non-woven fabric for an electric cell separator which comprises a short fiber of the high strength polyethylene fiber and has a specific thickness and METSUKE; an impact-resistant fabric member which comprises a woven or knitted fabric comprising the high strength polyethylene and having a specific thickness; an impact-resistant composite member which comprises the woven or knitted fabric being impregnated and integrated with a resin; and an impact-resistant sheet member. A novel polyethylene fiber which has an extremely small diameter and also high strength and high modulus, and further is excellent in heat resistance; and a non-woven fabric including the one for an electric cell separator, an impact-resistant member and the like using the polyethylene fiber are provided.