Abstract: Provided are a composite semipermeable membrane capable of enhancing adhesion between a separation functional layer provided with a coating layer and a protective tape while maintaining an effect of the coating layer to some extent, and a spiral membrane element using the composite semipermeable membrane. A composite semipermeable membrane includes: a porous support; a separation functional layer formed on the porous support; and a coating layer provided on a surface of the separation functional layer, the coating layer having different surface roughnesses due to different adhesion amounts of a coating material depending on locations. The composite semipermeable membrane has a coating layer-side surface on which a glossy portion having a surface roughness Ra of 30 nm or less and a non-glossy portion having a surface roughness Ra of 50 nm or more are provided.

Abstract: An object of the present invention is to provide a composite reverse osmosis membrane having improved water permeability and antifouling performance, and a method for producing the same. The composite reverse osmosis membrane of the present invention includes: a porous support; and a skin layer formed on a surface of the porous support. The skin layer contains a polyamide resin. The polyamide resin is a modified polyamide resin modified with an alkylenediamine derivative.

Abstract: A composite semipermeable membrane 12 of the present invention includes a porous support membrane 12a and a skin layer 12b supported by the porous support membrane 12a. The membrane surface of the composite semipermeable membrane 12 has an elastic modulus of 250 MPa or more and 500 MPa or less as calculated by force curve measurement using AFM in water. A spiral membrane element 20 of the present invention includes the composite semipermeable membrane 12 of the present invention. A water treatment system 100 of the present invention includes the spiral membrane element 20 of the present invention.

Abstract: A composite semipermeable membrane includes a porous support membrane, a separation functional layer containing a polyamide disposed on the porous support membrane, and a coating layer disposed on the separation functional layer, wherein a water contact angle of a surface of the coating layer is 40° or less, and a protein adsorption force of the surface of the coating layer is 0.4 nN or less.

Abstract: A sulfate ion removal system 100 includes: a flow passage 50; and a nanofiltration membrane 62 that is provided in the flow passage 50, has a cationic coating 40 constituting a surface of the membrane, and removes a sulfate ion contained in water to be treated by filtering the water to be treated. Treated water obtained by filtering, with the nanofiltration membrane 62, the water to be treated is, for example, injection water to be injected into an oil field.

Abstract: A separation membrane (10) of the present disclosure includes: a separation functional layer (30) composed of a polyamide; and a coating (40) covering the separation functional layer (30) and containing a polymer having a repeating unit represented by the following formula (1). In the formula (1), N+ is a nitrogen atom constituting a quaternary ammonium cation, and R1 and R2 are each independently a substituent containing a carbon atom bonded to the nitrogen atom.

Abstract: The purpose of the present invention is to provide: a composite semipermeable membrane which has three excellent properties, namely, excellent ionic substance rejecting property, excellent nonionic substance rejecting property and excellent water permeability in a practically balanced manner, and a spiral wound separation membrane element which comprises this composite semipermeable membrane. A composite semipermeable membrane according to the present invention is obtained by forming a skin layer that contains a polyamide-based resin on a surface of a porous support, and is configured such that: the polyamide-based resin is obtained by polymerizing a polyfunctional acid halide component and a polyfunctional amine component; the polyfunctional amine component contains m-phenylenediamine and at least one diamine compound represented by general formula (1); and a ratio (mol %) of a segment (A) derived from m-phenylenediamine and a segment (B) derived from the diamine compound in the polyamide-based resin is 99.

Abstract: A sulfate ion removal system 100 of the present invention includes: a flow passage 50; and a nanofiltration membrane 62 that is provided in the flow passage 50, has a cationic coating 40 constituting a surface of the membrane, and removes a sulfate ion contained in water to be treated by filtering the water to be treated. Treated water obtained by filtering, with the nanofiltration membrane 62, the water to be treated is, for example, injection water to be injected into an oil field.

Abstract: A separation membrane (10) of the present disclosure includes: a separation functional layer (30) composed of a polyamide containing, as a monomer unit, at least one selected from the group consisting of piperazine and a piperazine derivative; and a coating (40) covering the separation functional layer (30) and containing a polymer having a repeating unit represented by the following formula (1). In the formula (1), N+ is a nitrogen atom constituting a quaternary ammonium cation, and R1 and R2 are each independently a substituent containing a carbon atom bonded to the nitrogen atom.

Abstract: A separation membrane (10) of the present disclosure includes: a separation functional layer (30) composed of a polyamide containing, as a monomer unit, at least one selected from the group consisting of piperazine and a piperazine derivative; and a coating (40) covering the separation functional layer (30) and containing a polymer having a repeating unit represented by the following formula (1). In the formula (1), N+ is a nitrogen atom constituting a quaternary ammonium cation, and R1 and R2 are each independently a substituent containing a carbon atom bonded to the nitrogen atom.

Abstract: The purpose of the present invention is to provide a composite semipermeable membrane, which has excellent oxidant resistance (chlorine resistance) and salt rejection property, and a method for producing the same. The composite semipermeable membrane has a skin layer, which includes a polyamide-based resin obtained by polymerization of a polyfunctional amine component and a polyfunctional acid halide component and is formed on the surface of a porous support. The polyfunctional amine component includes an alicyclic diamine. The skin layer has an absorption peak intensity of at least 0.03 that is obtained by a Fourier transform infrared spectroscopy (FT-IR) transmission method and originates in the stretching vibration of C?O in the amide groups.

Abstract: A separation membrane (10) of the present disclosure includes: a separation functional layer (30) composed of a polyamide containing, as a monomer unit, at least one selected from the group consisting of piperazine and a piperazine derivative; and a coating (40) covering the separation functional layer (30) and containing a polymer having a repeating unit represented by the following formula (1). In the formula (1), N+ is a nitrogen atom constituting a quaternary ammonium cation, and R1 and R2 are each independently a substituent containing a carbon atom bonded to the nitrogen atom.

Abstract: A separation membrane (10) of the present disclosure includes: a separation functional layer (30) composed of a polyamide; and a coating (40) covering the separation functional layer (30) and containing a polymer having a repeating unit represented by the following formula (1). In the formula (1), N+ is a nitrogen atom constituting a quaternary ammonium cation, and R1 and R2 are each independently a substituent containing a carbon atom bonded to the nitrogen atom.

Abstract: The purpose of the present invention is to provide: a composite semipermeable membrane which has three excellent properties, namely, excellent ionic substance rejecting property, excellent nonionic substance rejecting property and excellent water permeability in a practically balanced manner, and a spiral wound separation membrane element which comprises this composite semipermeable membrane. A composite semipermeable membrane according to the present invention is obtained by forming a skin layer that contains a polyamide-based resin on a surface of a porous support, and is configured such that: the polyamide-based resin is obtained by polymerizing a polyfunctional acid halide component and a polyfunctional amine component; the polyfunctional amine component contains m-phenylenediamine and at least one diamine compound represented by general formula (1); and a ratio (mol %) of a segment (A) derived from m-phenylenediamine and a segment (B) derived from the diamine compound in the polyamide-based resin is 99.

Abstract: Disclosed is a positive-type photosensitive resin composition which has excellent storage stability, particularly excellent sensitivity stability, and can be formed into a cured film having excellent adhesion onto a substrate when heated at 350° C. or higher or heated in the air. The positive-type photosensitive resin composition comprises (a) a polymer having, as the main component, at least one structure selected from the group consisting of a polyimide precursor structure, a polybenzoxazole precursor structure, and a polyimide structure, (b) a quinonediazide compound, (c) a silane coupling agent having a styryl group, (d) a silane coupling agent having an epoxy group, an oxetanyl group, a methacryloxy group, an acryloxy group, an amino group, an amide group or mercapto group and an alkoxysilyl group, and (e) a solvent.

Abstract: Disclosed is a positive-type photosensitive resin composition which has excellent storage stability, particularly excellent sensitivity stability, and can be formed into a cured film having excellent adhesion onto a substrate when heated at 350° C. or higher or heated in the air. The positive-type photosensitive resin composition comprises (a) a polymer having, as the main component, at least one structure selected from the group consisting of a polyimide precursor structure, a polybenzoxazole precursor structure, and a polyimide structure, (b) a quinonediazide compound, (c) a silane coupling agent having a styryl group, (d) a silane coupling agent having an epoxy group, an oxetanyl group, a methacryloxy group, an acryloxy group, an amino group, an amide group or mercapto group and an alkoxysilyl group, and (e) a solvent.