| abstract |
PROBLEM TO BE SOLVED: To provide a separator made of an ultra-high molecular weight polyethylene composition having a high melting point and strength, capable of being thinned, having low low molecular weight components and excellent cleanliness. SOLUTION: For 100 parts by weight of ultrahigh molecular weight polyethylene having an intrinsic viscosity ([η]) of 10 dl / g or more and 80 dl / g or less, a weight average molecular weight (Mw) of 500,000 or less, a weight average molecular weight and a number average molecular weight (Mn) ) Is an ultrahigh molecular weight polyethylene composition containing 5 parts by weight or more and 5000 parts by weight or less of polyethylene having a ratio (Mw / Mn) of 4 or less. [Selection figure] None |