| abstract |
PROBLEM TO BE SOLVED: To provide a powdered N-long-chain acylglutamic acid and / or salt thereof and a method for producing the same which have extremely good solubility in water and are excellent in anti-caking property during storage. Also provided are cleaning compositions and cosmetic compositions containing such N-long chain acylglutamic acids and / or their salts. SOLUTION: In powder X-ray diffraction by CuKα ray, it has a main peak at a diffraction angle (2θ ± 0.3 °) of 20.0 to 23.0 ° and a water content of 0.01 to 3.4 weight. % N-long chain acylglutamic acid and / or salt thereof. The crystal is obtained by granulating and drying an aqueous solution of N-long-chain acylglutamic acid and / or a salt thereof, and subjecting the powder to a humidification treatment to cause transfer-crystallization of N-long-chain acylglutamic acid and / or a salt thereof, Next, the N-long-chain acylglutamic acid and / or salt thereof is produced by drying at a temperature not higher than the phase transition temperature from crystalline to amorphous, and is soluble in water, foamed and resistant to solids. Has excellent properties. [Selection figure] None |