FINE PARTICULATE PRUSSIAN BLUE AND PRODUCTION THEREOF

摘要

PURPOSE:To enable production of a product having excellent performances and characteristics rich in lipophilicity, by specifying reaction conditions, oxidizing or reducing the reaction product to provide prussian blue having specified crystallinity and specific surface area in reacting a ferric salt with an alkali metal ferrocyanide, etc. CONSTITUTION:This prussian blue is a fine particulate prussian blue having a homogeneous fine particulate crystal structure and =80m2/g BET specific surface area of particles. This prussian blue is produced by reacting a ferric salt with an alkali metal ferrocyanide or ammonium ferrocyanide in the presence of an ammonium salt and/or potassium salt at pH 0.1-2.5. In the reaction, the above-mentioned ferric salt is used in a molar amount of 1.0-1.5 times based on the afore-mentioned alkali metal ferrocyanide and the reaction product obtained by the reaction is then oxidized with an oxidizing agent or reduced with a reducing agent. This prussian blue is rich in lipophilicity and exhibits excellent performances and characteristics in coatings, printing inks, etc.