The present invention relates to a polysulfone copolymer with excellent heat resistance and chemical resistance, and a method for preparing the same and, more specifically, to a polysulfone copolymer and a method for preparing the same, wherein the polysulfone copolymer comprises, as repeat units, a sulfone-based compound, and an anhydrosugar alcohol, which is a biogenic material, and thus the polysulfone copolymer can solve a problem of an exhaustion of petroleum resources, which are limited resources; does not emit carbon dioxide regardless of the disposal after use, and thus is eco-friendly; and has significantly improved heat resistance and chemical resistance compared with existing polysulfone copolymers.

A method for producing a gas separation membrane containing fine particles uniformly dispersed in a resin, including the following (A) and (B): (A) a step of mixing the fine particles with a matrix resin, the amount of the fine particles with respect to the entire mass of the mixture being adjusted to 1 mass % to 50 mass %, to thereby prepare a master batch; and (B) a step including dissolving the master batch in a solvent, applying the prepared solution onto a substrate, and evaporating the solvent.

A method for producing a gas separation membrane containing fine particles uniformly dispersed in a resin, including the following (A) and (B): (A) a step of mixing the fine particles with a matrix resin, the amount of the fine particles with respect to the entire mass of the mixture being adjusted to 1 mass % to 50 mass %, to thereby prepare a master batch; and (B) a step including dissolving the master batch in a solvent, applying the prepared solution onto a substrate, and evaporating the solvent.

A to-be-treated liquid containing oil that is obtained from oil-containing discharged water is treated with an oil-resistant separation membrane to remove the oil.

The present invention relates to a copolymer containing a constitutional unit derived from acrylic acid cesium salt or acrylic acid rubidium salt and a constitutional unit derived from vinyl alcohol, a resin composition containing the copolymer, a carbon dioxide gas separation membrane which can be manufactured with the resin composition, a carbon dioxide gas separation membrane module having the separation membrane, and a carbon dioxide gas separation apparatus including at least one type of the module.

The present invention relates to a copolymer containing a constitutional unit derived from acrylic acid cesium salt or acrylic acid rubidium salt and a constitutional unit derived from vinyl alcohol, a resin composition containing the copolymer, a carbon dioxide gas separation membrane which can be manufactured with the resin composition, a carbon dioxide gas separation membrane module having the separation membrane, and a carbon dioxide gas separation apparatus including at least one type of the module.

The objective of the present invention is to provide a precision filter which is suitable for filtering a circuit board production process liquid, which is extremely excellent in the resistance to both a strongly acidic cleaning liquid and a strongly alkaline cleaning liquid and which is extremely excellent in the capability of removing an extremely fine foreign substance. Also, the objective of the present invention is to provide a precision filter cartridge which is used for a circuit board production process liquid and which includes the precision filter. Further, the objective of the present invention is to provide a method for producing a circuit board using the process liquid filtered by the precision filter for a circuit board production process liquid or the precision filter cartridge for a circuit board production process liquid. The precision filter to filtrate a process liquid for producing a circuit board according to the present invention is characterized in comprising a tetrafluoroethylene copolymer (I) having an amino group in a side chain.

Hollow fiber membranes having improved toughness and durability are prepared using a vinylidene fluoride polymer-containing component, such as Kynaro resins, having relatively low crystallinity. One aspect of the invention provides a membrane in the form of a fiber, wherein i) the fiber has a porous wall of a polymeric component enclosing a central hollow space extending the length of the fiber, ii) the polymeric component has a crystallinity as determined by wide angle x-ray diffraction of less than about 35%, iii) the polymeric component is comprised of at least one homopolymer or copolymer of vinylidene fluoride and iv) the membrane has an energy to break of at least about 0.5 J per square mm of membrane cross section.

Disclosed are methods for preparing a thin film composite membrane by subjecting a solution comprising one or more zwitterionic copolymers to an electrospraying process, thereby preparing the thin film composite membrane.

Disclosed are methods for preparing a thin film composite membrane by subjecting a solution comprising one or more zwitterionic copolymers to an electrospraying process, thereby preparing the thin film composite membrane.