US3375114A - High edge gradient silver halide emulsion - Google Patents
High edge gradient silver halide emulsion Download PDFInfo
- Publication number
- US3375114A US3375114A US443662A US44366265A US3375114A US 3375114 A US3375114 A US 3375114A US 443662 A US443662 A US 443662A US 44366265 A US44366265 A US 44366265A US 3375114 A US3375114 A US 3375114A
- Authority
- US
- United States
- Prior art keywords
- silver halide
- emulsion
- edge gradient
- halide emulsion
- high edge
- 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
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- 239000000839 emulsion Substances 0.000 title claims description 23
- -1 silver halide Chemical class 0.000 title claims description 19
- 229910052709 silver Inorganic materials 0.000 title claims description 12
- 239000004332 silver Substances 0.000 title claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 14
- KDXKERNSBIXSRK-UHFFFAOYSA-N Lysine Natural products NCCCCC(N)C(O)=O KDXKERNSBIXSRK-UHFFFAOYSA-N 0.000 description 8
- 239000004472 Lysine Substances 0.000 description 8
- 229960003646 lysine Drugs 0.000 description 8
- 239000004475 Arginine Substances 0.000 description 7
- 229960003121 arginine Drugs 0.000 description 7
- ODKSFYDXXFIFQN-UHFFFAOYSA-N arginine Natural products OC(=O)C(N)CCCNC(N)=N ODKSFYDXXFIFQN-UHFFFAOYSA-N 0.000 description 7
- 150000003839 salts Chemical class 0.000 description 6
- 239000000975 dye Substances 0.000 description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005070 ripening Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 2
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
- ODKSFYDXXFIFQN-BYPYZUCNSA-N L-arginine Chemical compound OC(=O)[C@@H](N)CCCN=C(N)N ODKSFYDXXFIFQN-BYPYZUCNSA-N 0.000 description 2
- BVHLGVCQOALMSV-JEDNCBNOSA-N L-lysine hydrochloride Chemical compound Cl.NCCCC[C@H](N)C(O)=O BVHLGVCQOALMSV-JEDNCBNOSA-N 0.000 description 2
- ISLYUUGUJKSGDZ-UHFFFAOYSA-N OC1=CC=NC2=NC=NN12 Chemical class OC1=CC=NC2=NC=NN12 ISLYUUGUJKSGDZ-UHFFFAOYSA-N 0.000 description 2
- 241000605112 Scapanulus oweni Species 0.000 description 2
- 241001363790 Talpa levantis Species 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 229960003589 arginine hydrochloride Drugs 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 239000008273 gelatin Substances 0.000 description 2
- 229920000159 gelatin Polymers 0.000 description 2
- 235000019322 gelatine Nutrition 0.000 description 2
- 235000011852 gelatine desserts Nutrition 0.000 description 2
- 229960005337 lysine hydrochloride Drugs 0.000 description 2
- SSOLNOMRVKKSON-UHFFFAOYSA-N proguanil Chemical compound CC(C)\N=C(/N)N=C(N)NC1=CC=C(Cl)C=C1 SSOLNOMRVKKSON-UHFFFAOYSA-N 0.000 description 2
- 230000033458 reproduction Effects 0.000 description 2
- 230000001235 sensitizing effect Effects 0.000 description 2
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ZMZDMBWJUHKJPS-UHFFFAOYSA-N thiocyanic acid Chemical compound SC#N ZMZDMBWJUHKJPS-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 101100412102 Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd) rec2 gene Proteins 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- SJOOOZPMQAWAOP-UHFFFAOYSA-N [Ag].BrCl Chemical compound [Ag].BrCl SJOOOZPMQAWAOP-UHFFFAOYSA-N 0.000 description 1
- XCFIVNQHHFZRNR-UHFFFAOYSA-N [Ag].Cl[IH]Br Chemical compound [Ag].Cl[IH]Br XCFIVNQHHFZRNR-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- HTKFORQRBXIQHD-UHFFFAOYSA-N allylthiourea Chemical compound NC(=S)NCC=C HTKFORQRBXIQHD-UHFFFAOYSA-N 0.000 description 1
- 229960001748 allylthiourea Drugs 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- XYXNTHIYBIDHGM-UHFFFAOYSA-N ammonium thiosulfate Chemical compound [NH4+].[NH4+].[O-]S([O-])(=O)=S XYXNTHIYBIDHGM-UHFFFAOYSA-N 0.000 description 1
- 125000003710 aryl alkyl group Chemical group 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- UREVLELSVZQJTM-UHFFFAOYSA-N benzene-1,4-diol;formaldehyde Chemical compound O=C.OC1=CC=C(O)C=C1 UREVLELSVZQJTM-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- DZVCFNFOPIZQKX-LTHRDKTGSA-M merocyanine Chemical compound [Na+].O=C1N(CCCC)C(=O)N(CCCC)C(=O)C1=C\C=C\C=C/1N(CCCS([O-])(=O)=O)C2=CC=CC=C2O\1 DZVCFNFOPIZQKX-LTHRDKTGSA-M 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- ZUNKMNLKJXRCDM-UHFFFAOYSA-N silver bromoiodide Chemical compound [Ag].IBr ZUNKMNLKJXRCDM-UHFFFAOYSA-N 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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
- G03C11/00—Auxiliary processes in photography
- G03C11/08—Varnishing, e.g. application of protective layers on finished photographic prints
- G03C11/10—Varnishing, e.g. application of protective layers on finished photographic prints for protection from ultraviolet light
-
- 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
- G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
- G03C1/08—Sensitivity-increasing substances
- G03C1/10—Organic substances
-
- 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
- G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
- G03C1/34—Fog-inhibitors; Stabilisers; Agents inhibiting latent image regression
Definitions
- Th invention r l t s to .a photographic emulsion .of silver halide and more particularly to a photographic emulsio gi ng a age of h e adient- Th at o o c g n densi y t .dis an'cem :the boundary between the darkened part and the undarkened part of a photographic image is vcalled edge gradient.
- edge gradient the higher the ,edge gradient the sharper the image. ln-orderto obtain animage of high edge gr'adient
- a special developing solution contains a small amount of sulfite salt, having a ;high pH value and containing hydroquinone alone as developer, has been ernployed (for example, ref. Yule, J.A.C., Formaldehyde- Hydroquinone Developers and Infectious-Development, J. Frank, Inst 239,221 (1945)).
- Photosensitive materials using such emulsion are suitable for making the half-tone reproductions -by means of reproduction screens such .as glass screen and contact screen.
- the above-mentioned object can be attained by adding to the emulsion (1) the derivatives o'f.4- hyd-roxy- 1,3,3a-7-tetrazaindene and (2) at least one compound selected from the group consisting of lysine and arginine and their salts.
- the derivatives of 4-hydroxy-'1, 3,3a,7- tetrazaindene are represented by the following structural formula:
- R and R represent hydrogen atom, allsyl group, aralkyl group or aryl group, and R represents hydrogen United States Patent /CH (in Additional examples of tetrazaindenes are as follows:
- the amount of compounds employed in this invention varies according to the sort of emulsion, but it is preferable to add 10 mgfito 1 g. of tetrazaindene, 0,1 g. to 10 g. of lysine or arginine or their salts per '1 mole of silver halide.
- Photographic emulsions are prepared in the following three stages: (1) The emulsification and digestion (first ripening) of the silver halide, (2) removal of excess of salts by washing with water and the like, and (3) second digestion (after ripening) to increase the sensitivity.
- the compounds maybe added at any stage. Tetrazaindene may be added either before or after the addition of lysine or arginine, but it is most preferable to add these substances after the second ripening and before coating.
- an emulsion of silver chloride, silver bromide, silver chlorobrornide, silver iodo bromide, or silver chloroiodo bromide maybe employed, but that of sil- 'e o o id smos preferable.
- the emulsion maybe chemicallysensitizedby unstable compounds containing sulfur, such as ammonium thiosulfate, and allyl thiourea (ref. P. Glafkides Chimie Photographique, 2 me Edition Photochinema, Paul Montel Paris 1957, pp. 297-299), and/ or a compound of gold such as a complex of aurous compound and thiocyanic acid (ref. ibid, p. 301) according to the Well-known method in the art.
- the emulsion may be optically sensitized by the addition of sensitizing dyes such as cyanine dyes or merocyanine dyes (for example, ref. Shinichi Kikuchi et al. Handbook of Scientific Photograph 1959, pp.
- the emulsion may contain a hardening agent such as chromium alum, formaldehyde, or
- a surface-active agent may be added.
- Tetrazaindenes have been well known as a stabilizer in the emulsion for negatives, but are employed in this invention to improve the contrast.
- the improvement of the halftone-dot due to the improvement of contrast that is the increase of edge gradient, cannot be attained because of the decrease of developing rate. Satisfactory results can be obtained by using tetrazaindenes along with arginine or lysine.
- EXAMPLE 2 As in Example 1, four samples were prepared by adding 5-canboxy-4-bydroxy-1,3,3a,7-tetrazaindene (II) and/or hydrochloric salt of arginine (VI) to the emulsion.
- the amounts of (II) and (VI) per 1 mole of silver halide were as follows:
- Sensitometry was carried out in the following manner. A test film was exposed to light, emitted from a tungsten lam-p (2666 K.) and passing through an optical stepwedge, and then developed at 20 C. in a developer of the following formula:
- a photographic emulsion of silver halide characterized in that in order to increase the edge gradient of image the said emulsion contains (1) at least one compound selected from the group consisting of 4-hydroxy-1,3,3a,7- tetrazaindenes which are represented by the following structural formula:
- R and R represent a member selected from the group consisting of hydrogen atom and alkyl groups and R represents a member selected from the group consisting of hydrogen atom, alkyl groups, cal-boxy groups, and carboalkyl groups, and (2) at least one compound selected from the group consisting of lysine, arginine and their salts.
- Amethod of increasing the edge gradient of image of silver halide photographic emulsion comprising adding thereto (1) at least one compound selected from the group 5 consisting of 4-hydroxy-1,3,3a,7-tetrazaindenes which are represented by the following structural formula:
Description
Th invention r l t s to .a photographic emulsion .of silver halide and more particularly to a photographic emulsio gi ng a age of h e adient- Th at o o c g n densi y t .dis an'cem :the boundary between the darkened part and the undarkened part of a photographic image is vcalled edge gradient. In general, the higher the ,edge gradient the sharper the image. ln-orderto obtain animage of high edge gr'adient,
a special developing solution contains a small amount of sulfite salt, having a ;high pH value and containing hydroquinone alone as developer, has been ernployed (for example, ref. Yule, J.A.C., Formaldehyde- Hydroquinone Developers and Infectious-Development, J. Frank, Inst 239,221 (1945)).
It is the object of this invention to provide a photographic emulsion Which gives an image of high contrast when a developing solution of this type isemployed.
Photosensitive materials using such emulsion are suitable for making the half-tone reproductions -by means of reproduction screens such .as glass screen and contact screen. The above-mentioned object can be attained by adding to the emulsion (1) the derivatives o'f.4- hyd-roxy- 1,3,3a-7-tetrazaindene and (2) at least one compound selected from the group consisting of lysine and arginine and their salts. The derivatives of 4-hydroxy-'1, 3,3a,7- tetrazaindene are represented by the following structural formula:
where R and R represent hydrogen atom, allsyl group, aralkyl group or aryl group, and R represents hydrogen United States Patent /CH (in Additional examples of tetrazaindenes are as follows:
0-. out
ing structural formulae:
Lysine (hydrochloride) Arginlne (hydrochloride) H:NC-NH- CH2CH2CH2$H-C O OH-H Cl 11in n11: (v1) The amount of compounds employed in this invention varies according to the sort of emulsion, but it is preferable to add 10 mgfito 1 g. of tetrazaindene, 0,1 g. to 10 g. of lysine or arginine or their salts per '1 mole of silver halide.
Photographic emulsions are prepared in the following three stages: (1) The emulsification and digestion (first ripening) of the silver halide, (2) removal of excess of salts by washing with water and the like, and (3) second digestion (after ripening) to increase the sensitivity. The compounds maybe added at any stage. Tetrazaindene may be added either before or after the addition of lysine or arginine, but it is most preferable to add these substances after the second ripening and before coating. These substances are dissolved in the solvents that have nodetrimental effect on the emulsion, for example, water, lower alcohols such as methanol and ethanol, andketones, and h a e t h cm sion- In this invention an emulsion of silver chloride, silver bromide, silver chlorobrornide, silver iodo bromide, or silver chloroiodo bromide maybe employed, but that of sil- 'e o o id smos preferable.
The emulsion maybe chemicallysensitizedby unstable compounds containing sulfur, such as ammonium thiosulfate, and allyl thiourea (ref. P. Glafkides Chimie Photographique, 2 me Edition Photochinema, Paul Montel Paris 1957, pp. 297-299), and/ or a compound of gold such as a complex of aurous compound and thiocyanic acid (ref. ibid, p. 301) according to the Well-known method in the art. The emulsion may be optically sensitized by the addition of sensitizing dyes such as cyanine dyes or merocyanine dyes (for example, ref. Shinichi Kikuchi et al. Handbook of Scientific Photograph 1959, pp.
S 1 Relative sensitivity Contrast Sharpness of dot amp e 1'30 2 15' 3' 1'30 2'15 3' rec 2'15 3' (1) 25 63 100 4 7 3 7. 0 D B C (n) 12 23 65 2. 7 5. 6 7. E C A (lll) 58 79 103 7. 7 6.9 6. 2 A C D (lv) 35 70 97 6.1 8. 1 7. 2 B A B Average slope between base density+fog density +0.1 and base density-Hog density+2.l.
-24, Maruzen Co.). The emulsion may contain a hardening agent such as chromium alum, formaldehyde, or
others (ref. ibid. pp. 29-47). In order to facilitate the 2 coating of emulsion, a surface-active agent may be added.
Tetrazaindenes have been well known as a stabilizer in the emulsion for negatives, but are employed in this invention to improve the contrast. When tetrazaindenes are used alone, the improvement of the halftone-dot due to the improvement of contrast, that is the increase of edge gradient, cannot be attained because of the decrease of developing rate. Satisfactory results can be obtained by using tetrazaindenes along with arginine or lysine.
As seen from this table, Sample iv provides sharp dots of high contrast in a wide range of time of development.
EXAMPLE 2 As in Example 1, four samples were prepared by adding 5-canboxy-4-bydroxy-1,3,3a,7-tetrazaindene (II) and/or hydrochloric salt of arginine (VI) to the emulsion. The amounts of (II) and (VI) per 1 mole of silver halide were as follows:
G./l. mole oi silver halide In order to facilitate the understanding of this inven- 30 tion, examples will be given hereafter. It should be 0 l0 realized that this invention is not limited by examples but 0.24 g 9 limited by the appended claims. M4
EXAMPLE 1 Reierence. Four samples weer prepared by adding 6-methyl-4-hy- Results of tests are summarized in the following table:
Relative sensitivity Contrast Sharpness oi dot Sample (i) 2s 63 100 4.0 7. a 7. 0 D B o n 11 20 as 2. a 4. 9 7. 5 E o A (iii) 77 90 10a 7. a 5. 7 5. 4 A o D (iv) 25 57 85 4. 2 7. 7 s. 1 B A A dnoxy-l,3,3a,7-tetrazaindene (II) and/or hydrochloride of As seen from this table, (iv) provides sharp dots of lysine (V) to the emulsion of silver chlorobromide which contains 30 mole percent of silver bromide, the optimum amounts of sensitizing dye and hardening agent, and gelatin in .a proportion of 105 g. of gelatin to 1 mole of silver halide. The amounts of (H) and (V) were as follows:
G./l. mole of silver halide Sample 1 Reference.
These samples were coated on film bases and dried. Then sensitometry and evaluation of halftone-dot were carried out using these test films.
Sensitometry Was carried out in the following manner. A test film was exposed to light, emitted from a tungsten lam-p (2666 K.) and passing through an optical stepwedge, and then developed at 20 C. in a developer of the following formula:
high contrast in a wide range of time of development.
What is claimed is:
1. A photographic emulsion of silver halide characterized in that in order to increase the edge gradient of image the said emulsion contains (1) at least one compound selected from the group consisting of 4-hydroxy-1,3,3a,7- tetrazaindenes which are represented by the following structural formula:
in which R and R represent a member selected from the group consisting of hydrogen atom and alkyl groups and R represents a member selected from the group consisting of hydrogen atom, alkyl groups, cal-boxy groups, and carboalkyl groups, and (2) at least one compound selected from the group consisting of lysine, arginine and their salts.
2. A photographic emulsion according to claim 1 wherein said compound (2) is lysine hydrochloride.
3. A photographic emulsion according to claim 1 wherein said compound (2) is arginine hydrochloride.
4. Amethod of increasing the edge gradient of image of silver halide photographic emulsion comprising adding thereto (1) at least one compound selected from the group 5 consisting of 4-hydroxy-1,3,3a,7-tetrazaindenes which are represented by the following structural formula:
lected from the group consisting of lysine, arginine and their salts.
5. A method according to claim 4 wherein said compound (2) is lysine hydrochloride.
6. A method according to claim 4 wherein said compound (2) is arginine hydrochloride.
References Cited UNITED STATES PATENTS 2,944,902 7/1960 Carroll et a1 96-107 NORMAN G. TORCHIN, Primary Examiner.
G. COHN, Assistant Examiner.
Claims (1)
1. PHOTOGRAPHIC EMULSION OF SILVER HALIDE CHARACTERIZED IN THAT IN ORDER TO INCREASE THE EDE GRADIENT OF IMAGE THE SAID EMULSION CONTAINS (1) AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF 4-HYDROXY, 1,3,3A,7TETRAZAINDENES WHICH ARE REPRESENTED BY THE FOLLOWING STRUCTURAL FORMULA:
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4741861 | 1961-12-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3375114A true US3375114A (en) | 1968-03-26 |
Family
ID=12774590
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US240452A Expired - Lifetime US3190752A (en) | 1961-12-26 | 1962-11-27 | High edge gradient silver halide emulsion |
| US443662A Expired - Lifetime US3375114A (en) | 1961-12-26 | 1965-03-29 | High edge gradient silver halide emulsion |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US240452A Expired - Lifetime US3190752A (en) | 1961-12-26 | 1962-11-27 | High edge gradient silver halide emulsion |
Country Status (2)
| Country | Link |
|---|---|
| US (2) | US3190752A (en) |
| DE (1) | DE1241262B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3519426A (en) * | 1966-12-27 | 1970-07-07 | Eastman Kodak Co | Preparation of silver halide emulsions having high covering power |
| US4456676A (en) * | 1983-06-10 | 1984-06-26 | E. I. Du Pont De Nemours And Company | Amine stabilizers for wash-off systems |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3345175A (en) * | 1963-05-17 | 1967-10-03 | Fuji Photo Film Co Ltd | High edge-gradient photosensitive material |
| US3333959A (en) * | 1963-05-21 | 1967-08-01 | Fuji Photo Film Co Ltd | High edge-gradient photosensitive materials |
| DE1182523B (en) * | 1963-07-11 | 1964-11-26 | Agfa Ag | Process for increasing the sensitivity of halogen silver emulsions |
| DE2628094A1 (en) * | 1975-06-30 | 1977-01-27 | Ricoh Kk | WET DEVELOPER FOR DEVELOPING TWO-COMPONENT DIAZOTYPE MATERIALS |
| US4189319A (en) * | 1975-07-18 | 1980-02-19 | Gaf Corporation | Arginine or salt thereof as a development accelerator of color development of color photographic materials |
| JPS5291429A (en) * | 1976-01-28 | 1977-08-01 | Fuji Photo Film Co Ltd | Printing plate producing procedure |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2944902A (en) * | 1956-07-30 | 1960-07-12 | Eastman Kodak Co | Sensitization of photographic emulsions with ionic polyalkylene oxide salts |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE335769A (en) * | 1925-10-07 | |||
| GB259926A (en) * | 1925-10-14 | 1927-09-22 | Ig Farbenindustrie Ag | Improvements relating to the manufacture of photographic silver halide emulsions |
-
1962
- 1962-11-27 US US240452A patent/US3190752A/en not_active Expired - Lifetime
- 1962-12-19 DE DEF38601A patent/DE1241262B/en active Pending
-
1965
- 1965-03-29 US US443662A patent/US3375114A/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2944902A (en) * | 1956-07-30 | 1960-07-12 | Eastman Kodak Co | Sensitization of photographic emulsions with ionic polyalkylene oxide salts |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3519426A (en) * | 1966-12-27 | 1970-07-07 | Eastman Kodak Co | Preparation of silver halide emulsions having high covering power |
| US4456676A (en) * | 1983-06-10 | 1984-06-26 | E. I. Du Pont De Nemours And Company | Amine stabilizers for wash-off systems |
| EP0128836A2 (en) * | 1983-06-10 | 1984-12-19 | E.I. Du Pont De Nemours And Company | Amine stabilizers for wash-off systems |
| EP0128836A3 (en) * | 1983-06-10 | 1987-10-14 | E.I. Du Pont De Nemours And Company | Amine stabilizers for wash-off systems |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1241262B (en) | 1967-05-24 |
| US3190752A (en) | 1965-06-22 |
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