Abstract: 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.

Abstract: The present invention provides anion exchange membranes, processes for producing same and uses thereof. The anion exchange membranes according to embodiments of the present invention achieve a desirable combination of low resistance, high permselectivity and low degree of dimensional swelling. Anion exchange membranes according to embodiments of the present invention are also cost effective.