US4585733A
Expired / Lapsed
US
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Method of preparing silver halide photographic emulsion
Assignee: Konica Minolta Inc
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Filing: 1984-05-04
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Granted: 1986-04-29
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Expires: 2004-05-04
Abstract
Abstract A method of preparing a silver halide photographic emulsion comprising silver chloride as a principal component, which comprises adding to an aqueous solution of a hydrophilic colloid, an aqueous solution of a water-soluble silver salt and an aqueous solution of a water-soluble halide according to a simultaneous mixing method, and maintaining the rate of addition of the aqueous solution of a water-soluble silver salt and that of the aqueous solution of a water-soluble halide at a level not higher than the critical growth rate of silver halide grains and, at the same time, setting and maintaining the EAg value during the addition of the aqueous solution of a water-soluble silver salt and the aqueous solution of a water-soluble halide to a level not lower than 130 mV and not higher than 160 mV, said silver halide photographic emulsion being prepared in the presence of a water-soluble rhodium salt which is added during the course of emulsification and physical ripening of the emulsion.
Inventors
- 👤 Atsuo Ezaki
- 👤 Morio Enomoto
- 👤 Takehisa Kishita
- 👤 Kazuo Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:30
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/015
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
167 words
A method of preparing a silver halide photographic emulsion comprising silver chloride as a principal component, which comprises adding to an aqueous solution of a hydrophilic colloid, an aqueous solution of a water-soluble silver salt and an aqueous solution of a water-soluble halide according to a simultaneous mixing method, maintaining the rate of addition of the aqueous solution of a water-soluble silver salt and that of the aqueous solution of a water-soluble halide at a level not higher than the critical growth rate of silver halide grains and, at the same time, setting and maintaining the EAg value during the addition of the aqueous solution of a water-soluble silver salt and the aqueous solution of a water-soluble halide to a level not lower than 130 mV and not higher than 160 mV and physical ripening of the emulsion, said silver halide photographic emulsion being prepared in the presence of a water-soluble rhodium salt which is added during the course of emulsification and physical ripening of the emulsion.
Claim 2
Independent Claim
167 words
A method of preparing a silver halide photographic emulsion comprising silver chloride as a principal component, which comprises adding to an aqueous solution of a hydrophilic colloid, an aqueous solution of a water-soluble silver salt and an aqueous solution of a water-soluble halide according to a simultaneous mixing method, maintaining the rate of addition of the aqueous solution of a water-soluble silver salt and that of the aqueous solution of a water-soluble halide at a level not higher than the critical growth rate of silver halide grains and, at the same time, setting and maintaining the EAg value during the addition of the aqueous solution of a water-soluble silver salt and the aqueous solution of a water-soluble halide to a level not lower than 130 mV and not higher than 160 mV and physical ripening of the emulsion, said silver halide photographic emulsion being prepared in the presence of a water-soluble rhodium salt which is added during the course of emulsification and physical ripening of the emulsion.
Claim 3
Dependent Claim
25 words
The method according to claim 1, wherein said silver chloride is contained in the emulsion in an amount of not less than 80 mole %.
Claim 4
Dependent Claim
35 words
The method according to claim 1, wherein said water-soluble rhodium salt is selected from the group consisting of rhodium dichloride, rhodium trichloride, hexachlororhodium acid ammonium salt and a complex of rhodium trichloride and a halogen.
Claim 5
Dependent Claim
30 words
The method according to claim 1, wherein the amount of the rhodium compounds to be added is preferably 10 -3 to 10 -5 mole per mole of the silver halide.
Claim 6
Dependent Claim
30 words
The method according to claim 1, wherein said EAg value is substantially kept constant at a fixed level of not lower than 130 mV and not higher than 160 mV.
Claim 7
Dependent Claim
20 words
The method according to claim 5, wherein said EAg value is substantially kept constant at a level of 130 mV.
Claim 8
Dependent Claim
20 words
The method according to claim 5, wherein said EAg value is substantially kept constant at a level of 140 mV.
Claim 9
Dependent Claim
20 words
The method according to claim 5, wherein said EAg value is substantially kept constant at a level of 150 mV.
Claim 10
Dependent Claim
102 words
The method according to claim 1, wherein said EAg value is controlled by dividing the aqueous solution of a water-soluble halide into two solutions, using one of the solutions for forming silver halide by adding halide ions in an amount substantially equimolar with silver ions to be added in a time unit with the addition of the aqueous solution of a water-soluble silver salt, and using the other of the solutions for controlling the EAg value by adding chloride ions and bromide ions so that the quantity variation in EAg value may be kept sufficiently small against the variation of EAg value.
Claim 11
Dependent Claim
19 words
The method according to claim 1, wherein said hydrophilic colloid is gelatin, polyvinyl alcohol or a mixture of these.
Claim 12
Dependent Claim
31 words
The method according to claim 1, wherein the total amount of said hydrophilic colloid is in the range of 0.5 to 100 g based on one liter of the aqueous solution.
Claim 13
Dependent Claim
22 words
The method according to claim 1, wherein said aqueous solution of a water-soluble silver salt is an aqueous solution of silver nitrate.
Claim 14
Dependent Claim
37 words
The method according to claim 1, wherein the halide in said aqueous solution of a water-soluble halide is selected from the group consisting of potassium iodide, sodium iodide, potassium bromide, sodium bromide, potassium chloride and sodium chloride.
Claim 15
Dependent Claim
42 words
The method according to claim 1, further comprising adjusting the EAg value after completion of the addition of the aqueous solution of a water-soluble silver salt and the aqueous solution of a water-soluble halide to a level not more than 100 mV.
Claim 16
Dependent Claim
42 words
The method according to claim 5, wherein EAg value after completion of the addition of the aqueous solution of a water-soluble silver salt and the aqueous solution of a water-soluble halide is adjusted to a level of not more than 100 mV.
Claim 17
Dependent Claim
78 words
The method according to claim 2, wherein the amount of the rhodium compounds to be added is preferably 10 -3 to 10 -5 mole per mole of the silver halide; said EAg value is substantially kept constant at a fixed level of not lower than 130 mV and not higher than 160 mV; and the total amount of said hydrophilic colloid is in the range of 0.5 to 100 g based on one liter of the aqueous solution.
Claim 18
Dependent Claim
93 words
The method according to claim 16, wherein said water-soluble rhodium salt is selected from the group consisting of rhodium dichloride, rhodium trichloride, hexachlororhodium acid ammonium salt and a complex of rhodium trichloride and a halogen; said hydrophilic colloid is gelatin, polyvinyl alcohol or a mixture of these; said aqueous solution of a water-soluble silver salt is an aqueous solution of silver nitrate; and the halide in said aqueous solution of a water-soluble halide is selected from the group consisting of potassium iodide, sodium iodide, potassium bromide, sodium bromide, potassium chloride and sodium chloride.
Claim 19
Dependent Claim
96 words
The method according to claim 9, wherein said silver chloride is contained in the emulsion in an amount of not less than 80 mole %; the amount of the rhodium compounds to be added is preferably 10 -3 to 10 -5 mole per mole of the silver halide; said EAg value is substantially kept constant at a fixed level of not lower than 130 mV and not higher than 160 mV; and the total amount of said hydrophilic colloid is in the range of 0.5 to 100 g based on one liter of the aqueous solution.
Claim 20
Dependent Claim
93 words
The method according to claim 18, wherein said water-soluble rhodium salt is selected from the group consisting of rhodium dichloride, rhodium trichloride, hexachlororhodium acid ammonium salt and a complex of rhodium trichloride and a halogen; said hydrophilic colloid is gelatin, polyvinyl alcohol or a mixture of these; said aqueous solution of a water-soluble silver salt is an aqueous solution of silver nitrate; and the halide in said aqueous solution of a water-soluble halide is selected from the group consisting of potassium iodide, sodium iodide, potassium bromide, sodium bromide, potassium chloride and sodium chloride.
Claim 21
Dependent Claim
25 words
The method according to claim 19, wherein said silver chloride is contained in the emulsion in an amount of not less than 90 mole %.
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