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AssigneeFuji Photo Film Co., Ltd.
InventorsNaoyuki Kawanishi, Takashi Ando, Yoichi Nagai
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Disclosed are a method for preparing grains of silver salt of an organic acid by reacting a solution containing silver ions and a solution containing an alkali metal salt of an organic acid, in which the reaction is performed in sealed mixing means and which comprises steps of supplying the solution containing silver ions into a reaction field solution before introduced into the sealed mixing means, and supplying the solution containing an alkali metal salt of an organic acid into the reaction field solution or sealed mixing means to which the solution containing silver ions has been supplied, etc. According to the present invention, high quality grains of silver salt of an organic acid can be efficiently produced at low cost.
A method for preparing grains of silver salt of an organic acid by reacting a solution containing silver ions and a solution containing an alkali metal salt of an organic acid, in which the reaction is performed in sealed mixing means and which comprises steps of supplying the solution containing silver ions into a reaction field solution before introduced into the sealed mixing means, and supplying the solution containing an alkali metal salt of an organic acid into the reaction field solution or sealed mixing means to which the solution containing silver ions has been supplied.
A method for preparing grains of silver salt of an organic acid by reacting a solution containing silver ions and a solution containing an alkali metal salt of an organic acid, which comprises steps of mixing the solution containing silver ions and the solution containing an alkali metal salt of an organic acid to conduct a reaction in sealed mixing means and removing by-product salts contained in the reaction mixture by filtration through an ultrafiltration membrane during or after the reaction.
A method for preparing an aqueous dispersion of grains of silver salt of an organic acid, which comprises reacting a solution containing silver ions and a solution containing an alkali metal salt of an organic acid to prepare grains of silver salt of an organic acid, then dispersing said grains by means of a high pressure homogenizer or high speed rotary homomixer in the presence of a dispersing agent, and removing by-product salts by ultrafiltration after or during the dispersion operation.
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