| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a production method for a composite porous membrane excellent in permeability and mechanical strengths. <P>SOLUTION: For production of the composite porous membrane having a first and a second porous layers on a support body for a hollow braid, the production method for the composite porous membrane includes a first coating step coating the support body with a first stock liquid for preparing a membrane which contains a polymer for forming the first porous layer by using an annular nozzle, a first coagulating step forming the first porous layer by coagulating the applied first stock liquid for preparing the membrane in a coagulation liquid, a second coating step coating the first porous layer with a second stock liquid for preparing the membrane which contains a polymer forming the second porous layer by using an annular nozzle, and a second coagulating step forming the second porous layer by coagulating the applied second stock liquid for preparing the membrane in a coagulating liquid, and in the second coating step, before applying the second stock liquid for preparing the membrane, a dilute stock liquid for preparing the membrane with a lower concentration of the polymer than the second stock liquid for preparing the membrane is applied on the first porous layer. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
