Silver Nitrate → HCID 178418580, compound

Participants

Reaction Steps

Benzotriazole (17.9 g) was dissolved in n-butyl acetate (300 ml), followed by the addition of water (300 ml). Silver nitrate (25.5 g) was dissolved in water (150 ml). The resulting solution was added to the previously prepared butyl acetate solution of benzotriazole under vigorous agitation. After 30-minute agitation, the aqueous phase was removed from the mixture, and the n-butyl acetate phase was washed with water. It was then washed with methanol and finally centrifuged to give benzotriazole silver (33.2 g). A portion (22.6 g) of the benzotriazole was added to a mixture of a 6% aqueous polyvinyl alcohol solution (600 ml) and a 6% aqueous gelatin solution (200 ml), and the reactants were mixed under agitatioh for 48 hrs. in a ball mill until a silver salt dispersion formed. An 8% aqueous polyvinyl alcohol solution was prepared in an amount of 150 ml, and in this solution, a 1% methanol solution of 3-amino-4-allyl-5-mercapto-1,2,4-triazole (14 ml), phthalazine (0.80 g), phthalic acid (1.0 g) and t-butylhydroquinone (2.1 g or 0.0125 mol) were dissolved. To the resultion solution, an 8% aqueous gelatin solution (50 ml) and 200 ml of the separately prepared silver salt dispersion were added. To the mixture, 25 ml of a silver iodobromide emulsion (particle size: 0.06 μm, silver iodide content: 4 mol %, gelatin content: 60 g per kg of the emulsion) was added, and the resulting coating solution was applied to photographic baryta paper to give a wet thickness of 55 μm, and the web was dried. Subsequently, a 3% acetone solution of diacetyl cellulose was applied to the emulsion layer to give a wet thickness of 55 μm, and the applied layer was dried to form a protective film.

Provenance & Evidence