US3658546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of incorporating photographic ingredients into photographic colloid compositions
Assignee: Agfa Gevaert NV
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Filing: 1970-03-20
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Granted: 1972-04-25
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Expires: 1990-03-20
Abstract
Abstract A substantially water-insoluble photographic ingredient is incorporated into a hydrophilic colloid coating composition, used for instance in coating a photographic material such as a lightsensitive emulsion composition or the like, by dissolving such ingredient in at least one substantially water-immiscible organic solvent for the ingredient, admixing the organic solvent solution with water in the presence of a dispersing agent and in the absence of any hydrophilic colloid, removing from this admixture substantially all of the water-immiscible organic solvent used in dissolving the ingredient, and incorporating the aqueous dispersion obtained following such solvent removal in the desired hydrophilic colloid composition.
Inventors
- 👤 Marcel Karel Van Doorselaer
- 👤 Gaston Jacob Benoy
- 👤 Jaak Pieter Van Vugt
- 👤 Raphael Karel Van Poucke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:41
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/388
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
27 words
Method according to claim 1, wherein said substantially water-immiscible solvent is soluble in water to the extent at most of 25 percent by weight at 20* C.
Claim 2
Dependent Claim
19 words
Method according to claim 1, wherein said substantially water-immiscible solvent has a boiling point of at most 130* C.
Claim 3
Dependent Claim
27 words
Method according to claim 1, wherein an organic solvent completely miscible with water is used together with said substantially water-immiscible solvent in order to dissolve said ingredient.
Claim 4
Dependent Claim
15 words
Method according to claim 1, wherein the said substantially water-immiscible solvent is removed by evaporation.
Claim 5
Dependent Claim
20 words
Method according to claim 1, wherein the said solvent is removed by evaporation under reduced pressure and/or by applying heat.
Claim 6
Dependent Claim
29 words
Method according to claim 1, wherein the dispersing agent is used in an amount comprised between 5 and 20 percent by weight relative to the weight of photographic ingredient.
Claim 7
Dependent Claim
23 words
Method according to claim 1, wherein the dispersing agent used is a derivative of the photographic ingredient carrying at least one water-solubilizing group.
Claim 8
Dependent Claim
20 words
Method according to claim 1, wherein the said hydrophilic colloid coating composition is a light-sensitive hydrophilic colloid silver halide emulsion.
Claim 9
Dependent Claim
40 words
Method according to claim 1, wherein the said substantially water-insoluble photographic ingredient is a member selected from the group consisting of a color coupler, a mask-former, a competing coupler, a light-absorbing dye, a sensitizing dye and an organic stabilizing agent.
Claim 10
Dependent Claim
48 words
Method according to claim 1, wherein the said ingredient is a color coupler, a mask-former or a competing coupler containing a long straight-chain or branched-chain aliphatic group having from five to 20 C-atoms which renders the said ingredient fast to diffusion in the said hydrophilic colloid coating composition.
Claim 11
Dependent Claim
13 words
Method according to claim 1 wherein said dispersing agent is an anionic surfactant.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |