| 摘要 |
PURPOSE:To obtain a semipermeable composite membrane having high permeability and excellent durability without making the thickness of an active layer thin, by performing the crosslinking reaction of a water-soluble polymer having an amino group and aromatic polyfunctional acid chloride on a porous support. CONSTITUTION:In obtaining a semipermeable composite membrane having high permeability, an aqueous solution containing a water-soluble org. polymer having an amino group in the main chain and/or the side chain thereof and water-soluble polyhydric alcohol as main components is applied to at least signal surface of a porous support and a part or all of water is subsequently evaporated by air-drying and/or heat treatment. Thereafter, the coated porous support is coated with a solution based on aromatic polyfunctional acid chloride, which is not compatible with water and has the reactivity with said amino group dissolved in a solvent not dissolving the porous support and can form a new bond through reaction, and crosslinking reaction is performed before drying. |
