反応 #696709

反応方程式

N-bromosuccinimide

silver nitrate

sodium hydroxide

sodium carbonate

behenic acid

stearic acid

potassium bromide

N-bromosuccinimide

→

silver bromide

silver stearate

silver behenate

溶媒

butyl acetate

water

water

反応条件

後処理

1. 1
   その他kept at 90° C.
2. 2
   workup.ADDITIONwas added
3. 3
   workup.STIRRINGWith stirring
4. 4
   その他was kept at 35° C.
5. 5
   workup.STIRRINGwith stirring
6. 6
   workup.ADDITIONwas added
7. 7
   workup.STIRRINGWith stirring
8. 8
   workup.WAITto stand for 10 minutes
9. 9
   その他separating into two layers
10. 10
    その他After the aqueous layer was removed
11. 11
    洗浄the remaining gel was washed two times with water

実験手順

To 12 liters of water were added 840 grams of behenic acid and 95 grams of stearic acid. To the solution kept at 90° C., a solution of 48 grams of sodium hydroxide and 63 grams of sodium carbonate in 1.5 liters of water was added. The solution was stirred for 30 minutes and then cooled to 50° C. whereupon 1.1 liters of a 1% aqueous solution of N-bromosuccinimide was added. With stirring, 2.3 liters of a 17% aqueous solution of silver nitrate was slowly added. While the solution was kept at 35° C., with stirring, 1.5 liters of a 2% aqueous solution of potassium bromide was added over 2 minutes. The solution was stirred for 30 minutes whereupon 2.4 liters of a 1% aqueous solution of N-bromosuccinimide was added. With stirring, 3,300 grams of a 1.2 wt % butyl acetate solution of polyvinyl acetate was added to the aqueous mixture. The mixture was allowed to stand for 10 minutes, separating into two layers. After the aqueous layer was removed, the remaining gel was washed two times with water. There was obtained a gel-like mixture off silver behenate, silver stearate, and silver bromide, which was dispersed in 1,800 grams of a 2.6% isopropyl alcohol solution of polyvinyl butyral (Denka Butyral #3000-K). The dispersion was further dispersed in 500 grams of polyvinyl butyral (Denka Butyral #4000-2) and 300 grams of isopropyl alcohol, obtaining an organic acid silver salt emulsion of needle grains having a mean minor diameter of 0.05 μm, a mean major diameter of 1.2 μm, and a coefficient of variation of 25%.

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