| abstract |
A composite semipermeable membrane having both water permeability and durability and a method for producing the same are provided. In the composite semipermeable membrane, the porous support includes a dense layer in contact with the separation functional layer, and a macrovoid layer located between the dense layer and the substrate, and the thickness of the dense layer is 0. 5 μm or more and 5 μm or less, the long diameter of the pores included in the dense layer is less than 0.5 μm, and the macrovoid layer is a composite half-pitch at a position where the distance from the interface between the separation functional layer and the porous support is 5 μm. Including a macrovoid having a width in the plane direction of the permeable membrane of 0.5 μm or more and 5 μm or less, and in the plane direction of the composite semipermeable membrane at a position 5 μm away from the interface between the separation functional layer and the porous support. Is a composite semipermeable membrane having 0.2 / μm to 1.8 / μm. [Selection] Figure 1 |