Abstract: A method for producing a particulate polymer includes polymerizing a monomer having a vinyl group in an aqueous solvent in the presence of a surfactin salt and a polymerization initiator, wherein a concentration of the surfactin salt in a polymerization reaction liquid is adjusted depending on a target particle diameter of the particulate polymer.

Abstract: The objective of the present invention is to provide a cleaning agent composition which can be used in the open air without any problems since the cleaning agent is environmentally friendly and which is effective for removing a low-molecular-weight and poorly-water-soluble cyclic silicone compound that causes a stain of a silicone sealing. The cleaning agent for washing out a silicone stain according to the present invention is characterized in comprising a cyclic lipopeptide biosurfactant, wherein the specific silicone stain compound such as D4 compound is the objective compound to be removed.

Abstract: The objective of the present invention is to provide a method for remarkably reducing a critical micelle concentration of an anionic surfactant, which is used in a large amount currently, to reduce the amount to be used. Also, the objective of the present invention is to provide a surfactant composition of which whole critical micelle concentration is remarkably reduced and in which an amount of an anionic surfactant is reduced in comparison with the case of using an anionic surfactant only as a surfactant. The method for reducing a critical micelle concentration of an anionic surfactant according to the present invention is characterized in using a cyclic lipopeptide biosurfactant in combination with the anionic surfactant.

Abstract: A method for producing a particulate polymer includes polymerizing a monomer having a vinyl group in an aqueous solvent in the presence of a surfactin salt and a polymerization initiator, wherein a concentration of the surfactin salt in a polymerization reaction liquid is adjusted depending on a target particle diameter of the particulate polymer.

Abstract: The objective of the present invention is to provide an inorganic nanoparticle dispersion liquid in which an amount of a surfactant is reduced or in which an inorganic nanoparticle is dispersed with improved dispersion stability, and a production method thereof. The method for producing an inorganic nanoparticle dispersion liquid according to the present invention is characterized in comprising the steps of mixing an inorganic nanoparticle, a cyclic lipopeptide biosurfactant and a medium, and dispersing the inorganic nanoparticle in the medium.

Abstract: The objective of the present invention is to provide a method for remarkably reducing a critical micelle concentration of an anionic surfactant, which is used in a large amount currently, to reduce the amount to be used. Also, the objective of the present invention is to provide a surfactant composition of which whole critical micelle concentration is remarkably reduced and in which an amount of an anionic surfactant is reduced in comparison with the case of using an anionic surfactant only as a surfactant. The method for reducing a critical micelle concentration of an anionic surfactant according to the present invention is characterized in using a cyclic lipopeptide biosurfactant in combination with the anionic surfactant.

Abstract: The objective of the present invention is to provide a cleaning agent composition which can be used in the open air without any problems since the cleaning agent is environmentally friendly and which is effective for removing a low-molecular-weight and poorly-water-soluble cyclic silicone compound that causes a stain of a silicone sealing. The cleaning agent for washing out a silicone stain according to the present invention is characterized in comprising a cyclic lipopeptide biosurfactant, wherein the specific silicone stain compound such as D4 compound is the objective compound to be removed.

Abstract: Disclosed is a method for producing an optically active 2-arylpiperidinium salt, comprising asymmetrically hydrogenating a pyridinium salt in the presence of an iridium complex and hydrogen, the 2-arylpiperidinium salt being represented by the following general formula (1): wherein R1, R2, X, *, and m are as described in Description, the pyridinium salt being represented by the following general formula (2): wherein R1, R2, X, and m are as described in Description, and the iridium complex being represented by the following general formula (3): IrH(Z)(Q)(PP*)??(3), wherein Z, PP*, and Q are as described in Description, or the following general formula (4): [{IrH(PP*)}2(?-Z)3]Z??(4), wherein Z and PP* are as described in Description.

Abstract: Disclosed is a method for producing an optically active 2-arylpiperidinium salt, comprising asymmetrically hydrogenating a pyridinium salt in the presence of an iridium complex and hydrogen, the 2-arylpiperidinium salt being represented by the following general formula (1): wherein R1, R2, X, *, and m are as described in Description, the pyridinium salt being represented by the following general formula (2): wherein R1, R2, X, and m are as described in Description, and the iridium complex being represented by the following general formula (3): IrH(Z)(Q)(PP*)??(3), wherein Z, PP*, and Q are as described in Description, or the following general formula (4): [{IrH(PP*)}2(?-Z)3]Z??(4), wherein Z and PP* are as described in Description.