EP0468389B1 - Methode zur Zugabe von Pulvern zu photographischen Systemen - Google Patents

Methode zur Zugabe von Pulvern zu photographischen Systemen Download PDF

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Publication number
EP0468389B1
EP0468389B1 EP91112204A EP91112204A EP0468389B1 EP 0468389 B1 EP0468389 B1 EP 0468389B1 EP 91112204 A EP91112204 A EP 91112204A EP 91112204 A EP91112204 A EP 91112204A EP 0468389 B1 EP0468389 B1 EP 0468389B1
Authority
EP
European Patent Office
Prior art keywords
dye
emulsion
dyes
powder
addition
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91112204A
Other languages
English (en)
French (fr)
Other versions
EP0468389A1 (de
Inventor
Eileen Mason
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sterling Diagnostic Imaging Inc
Original Assignee
Sterling Diagnostic Imaging Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sterling Diagnostic Imaging Inc filed Critical Sterling Diagnostic Imaging Inc
Publication of EP0468389A1 publication Critical patent/EP0468389A1/de
Application granted granted Critical
Publication of EP0468389B1 publication Critical patent/EP0468389B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
    • G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
    • G03C7/388—Processes for the incorporation in the emulsion of substances liberating photographically active agents or colour-coupling substances; Solvents therefor

Definitions

  • This invention relates to a process of preparing and making of photographic emulsions. Specifically, this invention relates to a particular method for the addition of a powdered material such as dyes to a photographic system. Examples of dyes include spectral sensitizing dyes, filter dyes and antihalation dyes. Also the present invention relates to emulsions containing such powders.
  • a powder such as a dye
  • spectral sensitization image quality improvement or antihalation.
  • spectral sensitization image quality improvement or antihalation.
  • such property may take the form of so-called “chemical sensitization” wherein various ingredients are added to change the sensitometry thereof.
  • it may also be necessary to alter the spectral response of the emulsions for one reason or another. If this is required, so-called “spectral sensitizing" dyes are added to this aqueous dispersion of gelatin and silver halide.
  • the dyes are conventionally large, organic molecules as is well-known and these are sometimes not very soluble in either an aqueous or in a mixture of organic/aqueous solvents. Thus, very dilute mixtures are made in order to dissolve the dye before adding the dye to the emulsion.
  • FR-A-2 381 337 and FR-A-2 381 335 where powders are incorporated into photographic coating compositions in the form of granules or pellets
  • US-A-4,755,446 and US-A-4,798,741 where additives are present in photosensitive materials within microcapsules.
  • dyes for example can be of the sensitizing, filter or antihalation type and they can be added to an under or backing layer.
  • Dyes of this type often are generally large, organic compounds and some have very complex structures. Many of the compounds are usually not very soluble in water and thus generally are either dispersed as a dilute water solution or some water miscible combination such as the lower alcohols or ketones.
  • the problem of adding the dye to the solvent is obvious. These dyes are conventionally fine, powdered materials and will color, stain and even cause physical problems if ingested while airborne.
  • I encapsulate the dry dye powder within a gelatin capsule.
  • the term "capsule" excludes a microcapsule
  • the process for achieving an encapsulation is well-known in the prior art.
  • the capsules are formed and the dry dye powder can be inserted therein using a conventionally known machine such as the Type 8 Standard Hard Capsule Filling Machine designed by CAPSUGEL, a Division of Warner-Lambert Co., Highland Park, MI.
  • These dye capsules can then be stored for long periods of time prior to use. Since a known amount of dry dye is placed within each capsule, the amount of dye added to the emulsion or gelatin layers is easily controlled.
  • gelatin capsules are compatible with the gelatin conventionally used within these photographic systems, problems of dispersion of the dye prevalent with other, dry methods, are not a problem here. Thus, one only needs to insure that the capsules have some time to dissolve and the dye will enter the emulsion properly. Since the capsules are essentially dry and dust-free, the problems of dry dye dispersion are also eliminated as is the addition of extra solvent and the like.
  • This example demonstrates the use of encapsulated, photographic sensitizing dye within a gelatino, silver halide emulsion.
  • a conventional, silver bromoiodide, tabular grain emulsion (ca. 98% Br and ca. 2% I) was prepared as well-known to those of normal skill in the art. This emulsion was then dispersed in a bulking amount of gelatin and brought to its optimum sensitivity with gold and sulfur salts as is also well-known. Standard antifoggants, wetting and coating aides were also present as well as hardeners. Since tabular grains have a low sensitivity in the green spectrum of the visible region, it is conventional to add a green spectral sensitizing dye to the emulsion in order to increase the sensitivity thereof.
  • Both emulsions were coated on a standard dimensionally stable polyethylene terephthalate film support which had been previously subbed with resin and gelatin sub layers to improve the adhesion of the emulsion.
  • the emulsion layers were coated to a coating weight of 4.7 mg Ag/dm 2 and then an overcoat layer of gelatin was applied supra thereto. After drying, samples of both elements were given a conventional exposure, developed, fixed, washed and dried. The physical and sensitometric properties of these elements were equivalent indicating that the encapsulated dyes had been dispersed and absorbed by the silver halide grains.
  • This example demonstrates the use of the encapsulation process for the preparation of an antihalation layer.
  • An emulsion suitable for preparing an antihalation layer was made by mixing 900 gms of an encapsulated Acid Violet 520 dye of the following structure: This material was encapsulated using the same equipment as Example 1 and the capsules contained in the neighborhood of 300 to 500 mg of dye per capsule.
  • the backing solution also contained about 60,000 gms of gelatin and about 690,900 gms of water, Additionally, this solution contained the usual wetting and coating aides and hardeners.
  • the capsules were dispersed in this solution at 60°C for about 3 minutes and appeared to be fully compatible with this mixture. For control purposes, the same dye dissolved in water was used.
  • Both gelatin solutions were coated on standard polyester base and a standard emulsion layer coated on the opposite side thereto. Both antihalation layers were equivalent in every respect as regards optical density and ability to absorb scattered light. The sensitometry of the silver halide emulsion layers were also equivalent.
  • the procedure described in this invention can be used with dyes used within any conventional, gelatino, silver halide element.
  • Cross contamination of various dyes which might be used to prepare any variety of element is avoided as well as the dusting and dirt problem normally associated with the dissolution of dyes into solvents.
  • the addition of alternate solvents to the silver halide emulsion is also avoided by the practice of this invention.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing Of Micro-Capsules (AREA)

Claims (5)

  1. Verfahren zur Herstellung einer photographischen, ein Pulver enthaltenden Emulsion, umfassend die Stufen:
    (a) Bilden einer Vielzahl von Gelatine-Kapseln,
    (b) Einführen von trockenem Pulver in jede der Vielzahl von Gelatine-Kapseln,
    (c) Zugabe der das Pulver enthaltenden Gelatine-Kapseln zu einer photographischen Emulsion, und
    (d) Auflösen der Gelatine-Kapseln in der Emulsion, um das Pulver in der Emulsion freisetzen zu können, um eine gleichförmige Dispersion oder Lösung des Pulvers zu erhalten.
  2. Verfahren gemäß Anspruch 1, worin das Pulver ein Farbstoff ist.
  3. Verfahren gemäß Anspruch 2, worin der Farbstoff ein photographischer Sensibilisierungsfarbstoff ist.
  4. Verfahren gemäß Anspruch 2, worin der Farbstoff ein Lichthofschutz-Farbstoff ist.
  5. Verfahren gemäß Anspruch 2, worin der Farbstoff ein Filter-Farbstoff ist.
EP91112204A 1990-07-23 1991-07-20 Methode zur Zugabe von Pulvern zu photographischen Systemen Expired - Lifetime EP0468389B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US55576090A 1990-07-23 1990-07-23
US555760 1990-07-23

Publications (2)

Publication Number Publication Date
EP0468389A1 EP0468389A1 (de) 1992-01-29
EP0468389B1 true EP0468389B1 (de) 1996-10-09

Family

ID=24218503

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91112204A Expired - Lifetime EP0468389B1 (de) 1990-07-23 1991-07-20 Methode zur Zugabe von Pulvern zu photographischen Systemen

Country Status (5)

Country Link
EP (1) EP0468389B1 (de)
JP (1) JPH04234030A (de)
AU (1) AU632954B2 (de)
CA (1) CA2047285A1 (de)
DE (1) DE69122567T2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5460937A (en) * 1993-10-20 1995-10-24 Eastman Kodak Company Process for incorporating a hydrophobic compound into an aqueous medium

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4755446A (en) * 1987-01-12 1988-07-05 E. I. Du Pont De Nemours And Company Photosensitive compositions containing microcapsules concentrated in surface layer
US4798741A (en) * 1985-12-13 1989-01-17 E. I. Du Pont De Nemours And Company Preparation of microencapsulated pigment

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1199570A (en) * 1966-10-31 1970-07-22 Agfa Gevaert Nv Method of Incorporating Photographic Ingredients Into Hydrophilic Colloids
GB1579481A (en) * 1977-02-18 1980-11-19 Ciba Geigy Ag Preparation of photographic material
GB1579625A (en) * 1977-02-18 1980-11-19 Ciba Geigy Ag Preparation of photographic material
FR2626088B1 (fr) * 1988-01-18 1990-06-01 Kodak Pathe Procede d'obtention d'une composition de couchage photographique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4798741A (en) * 1985-12-13 1989-01-17 E. I. Du Pont De Nemours And Company Preparation of microencapsulated pigment
US4755446A (en) * 1987-01-12 1988-07-05 E. I. Du Pont De Nemours And Company Photosensitive compositions containing microcapsules concentrated in surface layer

Also Published As

Publication number Publication date
AU8118891A (en) 1992-01-30
DE69122567T2 (de) 1997-02-13
DE69122567D1 (de) 1996-11-14
JPH04234030A (ja) 1992-08-21
AU632954B2 (en) 1993-01-14
EP0468389A1 (de) 1992-01-29
CA2047285A1 (en) 1992-01-24

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