Process for producing silver salt of benzotriazole

Abstract

Abstract THE SILVER SALT OF BENZOTRIAZOLE HAVING A PARTICLE SIZE OF LESS THAN 5 MICRONS IN LENGTH IS PREPARED BY A SPECIFIC COMBINATION OF SOLVENTS USED FOR THE REACTION OF SILVER NITRATE AND BENZOTRIAZOLE IN SOLUTION. SILVER NITRATE IS DISSOLVED IN SOLVENT A WHICH IS MISCIBLE WITH NITRIC ACID WHICH MIGHT BE FORMED BY THE ABOVE REACTION. SOLVENT A MAY, FOR EXAMPLE, BE WATER, DIMETHYLFORMAMIDE OR DIMETHYLSULFOXIDE. BENZOTRIAZOLE IS DISSOLVED IN SOLVENT B WHICH IS A SOLVENT FOR BENZOTRIAZOLE, BUT WHICH DOES NOT SUBSTANTIALLY OR COMPLETELY DISSOLVE THE SILVER SALT OF BENZOTRIAZOLE. WHEN SOLVENT A IS WATER, SOLVENT B MAY, FOR EXAMPLE, BE TRICRESYL PHOSPHATE, DIMETHOXY ETHYL PHTHALATE, DI-N-BUTYL PHTHALATE, DIETHYL SEBACRATE, MONOOCTYL-DIBUTYL PHOSPHATE, TRIBUTYL PHOSPHATE OR CASTOR OIL. WHERE SOLVENT A IS DIMETHYL FORMAMIDE OR DIMETHYL SUFLOXIDE, SOLVENT B MAY, FOR EXAMPLE, BE COTTONSEED OIL, LINSEED OIL OR TSUBAKI OIL. SOLUTIONS OF SILVER NITRATE IN SOLVENT A AND BENZOTRIAZOLE IN SOLVENT B ARE MIXTED TO FORM THE SILVER SALT OF BENZOTRIAZOLE. THE PRODUCT IS WASHED WITH WASHING LIQUID C WHICH MAY, FOR EXAMPLE, BE METHANOL, ETHANOL OR ACETONE. TO THE REACTION SYSTEM THERE CAN BE ADDED A SURFACTANT TO MAKE THE SIZE OF THE OBTAINED PARTICLES UNIFORM.

Inventors

• 👤 Kinji Ohkubo
• 👤 Junpei Noguchi
• 👤 Takao Masuda

Bibliographic Details