PRODUCTION OF FINE PARTICLES OF BENZOTRIAZOLE DERIVATIVE

摘要

PROBLEM TO BE SOLVED: To provide a method for efficiently producing fine particles of benzotriazole deriv. SOLUTION: An aq. soln. of water-soluble cellulose deriv., polyvinylalcohol or polyvinylalcohol deriv. is used as a dispersion medium. A benzotriazole deriv. is pulverized in a wet state by using beads under conditions for giving <=70 deg. contact angle with the dispersion medium while mechanical shearing force is added. Thus, fine particles of 0.05 to 0.35μm average particle size are obtd.