WO1991010167A1 - Produits pour la photographie en couleurs contenant une couche de grains tabulaires reflechissants - Google Patents
Produits pour la photographie en couleurs contenant une couche de grains tabulaires reflechissants Download PDFInfo
- Publication number
- WO1991010167A1 WO1991010167A1 PCT/FR1990/000911 FR9000911W WO9110167A1 WO 1991010167 A1 WO1991010167 A1 WO 1991010167A1 FR 9000911 W FR9000911 W FR 9000911W WO 9110167 A1 WO9110167 A1 WO 9110167A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- grains
- silver halide
- layers
- photographic product
- Prior art date
Links
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
- 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
- G03C7/3029—Materials characterised by a specific arrangement of layers, e.g. unit layers, or layers having a specific function
Definitions
- Products for color photography usually comprise three layers or three types of silver halide emulsion layers sensitive respectively to a separate third of the visible spectrum, ie blue, green and red. Because silver halides are inherently blue sensitive, the blue sensitive layer or layers are generally placed on the exposure side. Most of the blue light is thus absorbed. The rest of the blue light is absorbed by a filter layer absorbing the blue light which is generally placed between the layer or layers sensitive to blue and the layers sensitive to green and red, in order to avoid that the layers sensitive to green and red intrinsically sensitive to blue are not bothered by blue light. This part of the blue light absorbed by the filter was not used in the blue sensitive layer, which corresponds to a reduction in the sensitivity of the blue sensitive layer.
- tabular silver halide grains are known.
- United States patent 4,439,520 (Kofron) describes tabular grains having a thickness less than 0.5 ⁇ m, a diameter greater than 0.6 ⁇ m and an average shape index greater than 8/1, representing more than 50% of the total projected surface of the silver halide grains.
- These tabular grains are used in products for color photography, as photosensitive grains forming developable latent image. They have the advantage of having a native sensitivity to blue light lower than that of non-tabular grains, which reduces the interference of blue light in the layers sensitive to green and red, and makes it possible to modify the order. layers on the support if desired.
- the grains of 0.05 ⁇ m thickness also have the advantage, compared to the grains of 0.15 ⁇ m thickness, of having better reflection for the same silver content on the layer. .
- the reflection of the flat grains could be increased by 0.15 ⁇ m in thickness by increasing the silver content of the emulsion.
- the grains having thicknesses of between 0.03 and 0.07 ⁇ m are however preferred since they allow the use of emulsions with lower silver titers, which is always advantageous, without however degrading the sensitometric properties of the layers.
- the modulation interval of the D / Log E curve (density as a function of the logarithm of exposure) of a photographic emulsion is the difference of the exposure values between the foot and the shoulder of the curve, or between the maximum density and the minimum density.
- the tabular grains used as a sublayer in the invention must not be photosensitive in the modulation range of the photosensitive grains forming the image.
- the intrinsic sensitivity of the tabular grains used in the present invention must be 2 log E less than the sensitivity of the grains forming the image.
- the intrinsic sensitivity represents the sensitivity of the silver halide grains before any treatment such as the addition of sensitizing dyes, and in particular before formation of the haze, in the case where hazy grains are used.
- Example 3 of Table VI of this patent gives a process for preparing tabular grains of 0.15 ⁇ m thick and 19: 1 shape index.
- Table XI grains of 0.19 ⁇ m, 0.07 and 0.06 ⁇ m are found, with shape indices of 40: 1, 40: 1 and 27: 1, respectively.
- Table XVIII emulsion 1 contains grains 0.10 ⁇ m thick, and with a shape index of 16: 1.
- the silver titles of the intermediate layer of tabular grains according to the invention can vary from 2 to 10 mg / dm. It has indeed been shown that outside these limits the increases in sensitivity obtained, although present, are too small to be useful.
- This layer is located, as indicated above, under one of the layers or under each layer of blue-sensitive emulsion of a color photographic product. Preferably, it is adjacent to a blue-sensitive layer. However, it can optionally be separated from it, for example by a layer of gelatin containing photographically useful adjuvants.
- the intermediate layer of tabular grains may itself contain adjuvants such as those described in Research Disclosure, Vol 176, December 1978, Article 17643, Sections V and VI and IX to XII, and possibly photographically useful substances.
- Color photographic products in which the intermediate layer of tabular grains according to the invention can be used are all products having the conventional structure in three layers or three sets of layers sensitive respectively to blue, green and red light, one of the layers sensitive to blue on the exposure side.
- the reference cited above contains all that relates to the preparation of emulsions (sections I and II), chemical and spectral sensitizations (sections III and IV), adjuvants such as optical brightening agents (section V) , anti-stars and stabilizers (section VI), vehicles (section IX), tanning agents (section X), coating aids (section XI), plasticizers and lubricants (section XII).
- the intermediate layer of tabular grains according to the invention can be applied with the other layers of the photographic product by any known coating process, such as those described in the Research Disclosure reference cited above, section XV, on supports such as those described in the same reference section XVII.
- the support for the photographic product can be a transparent film or it can be reflective, such as paper.
- the photographic product is an invertible product, that is to say it is treated in a first black and white developer to develop the silver halide in the exposed areas , veiled by exposure or chemically, then developed in a chromogenic developer to obtain, after money laundering, a positive color image of the original.
- the tabular grains of the intermediate layer are previously veiled, so as to be developed in the first black and white development and not to interfere in the subsequent chromogenic development.
- the tabular grains can be veiled by exposure or chemically, with any veiling agent known in the art. We can for example, use stannous chloride.
- monolayer products comprising, on a paper support coated with polyethylene, in the order:
- Another identical product, but not containing the intermediate layer, is prepared to serve as a control.
- Another identical product, but not containing the intermediate layer of tabular grains, is prepared to serve as a control.
- the two products are exposed and treated as indicated for the products of Examples 1 to 4.
- Test I modulated exposure of the magenta and uniform layer of the yellow and cyan layers
- Test II modulated exposure of the magenta and cyan layers and uniform of the yellow layer.
- the interimage effect is expressed as the difference in density ⁇ D between the two extreme degrees of the scale sensitometric, for each product, in the yellow layer exposed uniformly.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR89/17514 | 1989-12-26 | ||
FR8917514A FR2656434A1 (fr) | 1989-12-26 | 1989-12-26 | Produits pour la photographie en couleurs contenant une couche de grains tabulaires reflechissants. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991010167A1 true WO1991010167A1 (fr) | 1991-07-11 |
Family
ID=9389193
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1990/000911 WO1991010167A1 (fr) | 1989-12-26 | 1990-12-14 | Produits pour la photographie en couleurs contenant une couche de grains tabulaires reflechissants |
PCT/US1990/007600 WO1991010168A1 (fr) | 1989-12-26 | 1990-12-21 | Produits photographiques couleur contenant une couche de grains tabulaires reflechissante |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1990/007600 WO1991010168A1 (fr) | 1989-12-26 | 1990-12-21 | Produits photographiques couleur contenant une couche de grains tabulaires reflechissante |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0511969A1 (fr) |
FR (1) | FR2656434A1 (fr) |
WO (2) | WO1991010167A1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9302860D0 (en) * | 1993-02-12 | 1993-03-31 | Kodak Ltd | Photographic elements for producing blue,green and red exposure records of the same hue and methods for the retrival and differentiation of the exposure |
EP0709731A3 (fr) * | 1994-10-25 | 1996-07-24 | Agfa Gevaert Ag | Produit photographique couleur à l'halogénure d'argent |
EP1041437A1 (fr) * | 1999-04-01 | 2000-10-04 | Eastman Kodak Company | Pellicule photographique couleur ayant rapidité au bleu améliorée |
US6001548A (en) * | 1999-04-15 | 1999-12-14 | Eastman Kodak Company | Color photographic film with a plurality of grain populations in its red recording layer unit |
US5998114A (en) * | 1999-04-15 | 1999-12-07 | Eastman Kodak Company | Color photographic film exhibiting increased red speed and sharpness |
DE60129919T2 (de) * | 2000-12-14 | 2007-12-06 | Fujifilm Corp. | Lichtempfindliches photographisches Silberhalogenidmaterial und Verfahren zu dessen Behandlung |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4751174A (en) * | 1985-10-25 | 1988-06-14 | Fuji Photo Film Co., Ltd. | Silver halide photographic material with light-insensitive silver halide emulsion layer |
EP0273411A2 (fr) * | 1986-12-26 | 1988-07-06 | Fuji Photo Film Co., Ltd. | Emulsion à l'halogénure d'argent sensible à la lumière et matériaux photographiques couleurs l'utilisant |
US4772546A (en) * | 1985-10-16 | 1988-09-20 | Fuji Photo Film Co., Ltd. | Silver halide photographic material with high interimage effects |
-
1989
- 1989-12-26 FR FR8917514A patent/FR2656434A1/fr not_active Withdrawn
-
1990
- 1990-12-14 WO PCT/FR1990/000911 patent/WO1991010167A1/fr not_active Application Discontinuation
- 1990-12-14 EP EP19910901468 patent/EP0511969A1/fr not_active Ceased
- 1990-12-21 WO PCT/US1990/007600 patent/WO1991010168A1/fr unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4772546A (en) * | 1985-10-16 | 1988-09-20 | Fuji Photo Film Co., Ltd. | Silver halide photographic material with high interimage effects |
US4751174A (en) * | 1985-10-25 | 1988-06-14 | Fuji Photo Film Co., Ltd. | Silver halide photographic material with light-insensitive silver halide emulsion layer |
EP0273411A2 (fr) * | 1986-12-26 | 1988-07-06 | Fuji Photo Film Co., Ltd. | Emulsion à l'halogénure d'argent sensible à la lumière et matériaux photographiques couleurs l'utilisant |
Also Published As
Publication number | Publication date |
---|---|
FR2656434A1 (fr) | 1991-06-28 |
EP0511969A1 (fr) | 1992-11-11 |
WO1991010168A1 (fr) | 1991-07-11 |
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