| 摘要 |
Provided is an extra-fine fiber sheet which is formed of a fiber assembly that is configured of extra-fine fibers having an average fiber diameter of 500 nm or less. This extra-fine fiber sheet is provided with an extra-fine fiber assembly, which is configured of (A) a solvent-spinnable polymer that has a weight average molecular weight of 5,000-100,000 and serves as a main component and (B) a polymer that has a weight average molecular weight not less than 10 times the weight average molecular weight of the polymer (A) and serves as an auxiliary component, and wherein the constituent fibers have an average fiber diameter of 10-500 nm. The polymer (A) may be a low-conductive or non-conductive polymer, and the polymer (B) may be a thickening polymer. |
