| 摘要 |
PURPOSE:To produce silver halide particles having superior performance in large quantities by feeding a soln. of a water soluble silver salt and a soln. of a water soluble halide into a mixing chamber in a reactor filled with a colloidal aqueous soln. and by rapidly stirring the fed solns. in the colloidal aqueous soln. CONSTITUTION:A mixing chamber 1 composed essentially of three rotating impellers 6, a short outer tube 4 having plural slits 7 and plural baffle plates 8 fitted to the inside and a number of high-speed rotating vanes 3 in the tube 4 is set in a reactor 9. A colloidal aqueous soln. is filled into the reactor 9, a soln. of a water soluble silver salt and a soln. of a water soluble halide are injected into the mixing chamber 1 from plural nozzles 2 and the vanes 3 are rotated at such a high speed at 500-5,000r.p.m. The injected solns. are diluted with the colloidal aqueous soln. and brought into a reaction by high-speed stirring to form silver halide particles having superior performance with respect to particle size, average size and crystals phase. The silver halide particles are discharged into the colloidal aqueous soln. in the reactor 9 through the slits 7 in the tube 4 rotating at a low speed in the form of upper and lower flows and the silver particles in the flows are grown. Thus, a superior photographic silver halide emulsion comparable to that produced in a small reactor is produced in large quantities. |
