Abstract: Provided is a method for manufacturing a sheet-shaped separation membrane that allows a sheet-shaped separation membrane having uniform separating ability to be manufactured at a high speed, the method comprising manufacturing a sheet-shaped separation membrane by forming a microporous layer on a porous substrate, wherein the method is characterized in having: a membrane-forming solution application step of coating a porous substrate with a membrane-forming solution in which a polymer is dissolved in a solvent, a congealing liquid application step of applying a congealing liquid by a liquid membrane drop method to the porous substrate coated with the membrane-forming solution, and a solvent removal step of removing the solvent from the congealed microporous layer.

Abstract: An object of the present invention is to provide a composite membrane support composed of a dry process thermoplastic resin filaments nonwoven fabric having a significantly high uniformity to enable formation of a porous layer free from strike-through or a defect such as pinhole at the film formation, producing no skin layer defect at the formation of a skin layer, and being excellent in the mechanical strength and dimensional stability at high temperatures, and a high-performance composite membrane and a composite membrane element each using the composite membrane support. The composite membrane support of the present invention is a laminate dry process thermoplastic resin filaments nonwoven fabric comprising three or more layers containing at least a meltblown fiber layer as an interlayer and spunbond fiber layers on both sides of the interlayer, wherein the average value of air flow resistance is from 2.0 to 30.

Abstract: Provided is a method for manufacturing a sheet-shaped separation membrane that allows a sheet-shaped separation membrane having uniform separating ability to be manufactured at a high speed, the method comprising manufacturing a sheet-shaped separation membrane by forming a microporous layer on a porous substrate, wherein the method is characterized in having: a membrane-forming solution application step of coating a porous substrate with a membrane-forming solution in which a polymer is dissolved in a solvent, a congealing liquid application step of applying a congealing liquid by a liquid membrane drop method to the porous substrate coated with the membrane-forming solution, and a solvent removal step of removing the solvent from the congealed microporous layer.

Abstract: An object of the present invention is to provide a composite membrane support composed of a dry process thermoplastic resin filaments nonwoven fabric having a significantly high uniformity to enable formation of a porous layer free from strike-through or a defect such as pinhole at the film formation, producing no skin layer defect at the formation of a skin layer, and being excellent in the mechanical strength and dimensional stability at high temperatures, and a high-performance composite membrane and a composite membrane element each using the composite membrane support. The composite membrane support of the present invention is a laminate dry process thermoplastic resin filaments nonwoven fabric comprising three or more layers containing at least a meltblown fiber layer as an interlayer and spunbond fiber layers on both sides of the interlayer, wherein the average value of air flow resistance is from 2.0 to 30.

Abstract: Provided is a process for continuously producing a composite reverse osmosis membrane comprising a polyamide skin layer and a porous support for supporting the polyamide skin layer, the method comprising: A) applying an aqueous solution ? containing a compound having two or more reactive amino groups to form a covering layer of an aqueous solution on the porous support while moving the porous support; B) permeating the aqueous solution ? in micro pores of the porous support by holding the covering layer on the porous support for 0.2 to 15 seconds; C) removing the covering layer while holding the aqueous solution ? within the micro pores of the porous support; and D) forming the polyamide skin layer by applying an organic solution ? containing a polyfunctional acid halide onto the surface of the porous support to make the aqueous solution ? contact the organic solution ? for interfacial polymerization.

Abstract: A hydrophilized porous film which can be obtained through hydrophilizing by a simple method without impairing rejection performance and permeation performance and easily retains the properties of a film material, and to provide a process for producing the same. The hydrophilized porous film comprises a hydrophobic polymer and dispersed therein an organized clay which has been organized with a hydrophilic compound, and is obtained by a process including a step of dispersing a clay organized with a hydrophilic compound in a solution of a hydrophobic polymer and a step of subjecting this solution to phase separation to obtain the hydrophilized porous film.

Abstract: A hydrophilized porous film which can be obtained through hydrophilizing by a simple method without impairing rejection performance and permeation performance and easily retains the properties of a film material, and to provide a process for producing the same. The hydrophilized porous film comprises a hydrophobic polymer and dispersed therein an organized clay which has been organized with a hydrophilic compound, and is obtained by a process including a step of dispersing a clay organized with a hydrophilic compound in a solution of a hydrophobic polymer and a step of subjecting this solution to phase separation to obtain the hydrophilized porous film.