Patent ID: 9174174
Filing Date: 2015-11-03
Classification: B01D,C02F

Abstract:
1. A separation membrane comprising a separation-functional layer, wherein the separation-functional layer contains a polyvinylidene fluoride resin having a melt viscosity of 3,300 Pa·s or more and 7,000 Pa·s or less, and the separation-functional layer has a three-dimensional network structure, wherein when the separation-functional layer is divided into thin layers each having a thickness of 0.2 μm along the thickness direction, 50 to 400 thin layers have a maximum pore diameter of 0.03 to 0.6 μm, 1 to 100 thin layers have a maximum pore diameter of 0.1 μm or more and less than 0.2 μm, 1 to 30 thin layers have a maximum pore diameter of 0.03 μm or more and less than 0.1 μm, and 0 to 2 thin layers have a maximum pore diameter of less than 0.03 μm.