SOLID FATTY ACID ALKYL ESTER SULFONATE METAL SALT AND METHOD FOR PRODUCING FATTY ACID ALKYL ESTER SULFONATE METAL SALT POWDER WITH SHARP PARTICLE SIZE DISTRIBUTION
THE INVENTION PROVIDES (1) A SOLID FATTY ACID ALKYL ESTER SULFONATE METAL SALT HAVING AN ENDOTHERMIC PEAK AREA BETWEEN 50°C AND 130°C OF 50% OR MORE RELATIVE TO THE WHOLE ENDOTHERMIC PEAK AREA BETWEEN 0°C AND 130°C WHEN DETERMINED USING A DIFFERENTIAL SCANNING CALORIMETER; AND (2) A METHOD FOR PRODUCING A FATTY ACID ALKYL ESTER SULFONATE METAL SALT POWDER, INCLUDING A STEP OF PULVERIZING THE SOLID FATTY ACID ALKYL ESTER SULFONATE METAL SALT (1) IN A PULVERIZER, WITH THE INTERNAL TEMPERATURE OF THE PULVERIZER BEING ADJUSTED TO 30°C OR MORE AND 50°C OR LESS.