US2994610A - Color radiography - Google Patents

Color radiography Download PDF

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Publication number
US2994610A
US2994610A US681892A US68189257A US2994610A US 2994610 A US2994610 A US 2994610A US 681892 A US681892 A US 681892A US 68189257 A US68189257 A US 68189257A US 2994610 A US2994610 A US 2994610A
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United States
Prior art keywords
color
coupler
different
shadows
highlights
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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US681892A
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English (en)
Inventor
Maus Fritz
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.)
Agfa Gevaert NV
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Agfa AG
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Filing date
Publication date
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Publication of US2994610A publication Critical patent/US2994610A/en
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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
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/16—X-ray, infrared, or ultraviolet ray processes

Definitions

  • the ratio between the brightness of the front and back foils deviates from the value 1 to an extent which depends on the foils and exposure conditions which are used. This means that, depending on whether the film is disposed with its front or back facing the tube, a different color trend is obtained when the sensitivities of the emulsions on the front and back differ from one another. Furthermore, the use of a highly sensitive but non-contrasty emulsion causes an undesirable flattening in the initial part of the gradation curve. These disadvantages can be avoided to a certain degree by using ma- :erial of similar structure on the front and back, but this results in additional expense in the production of the naterial.
  • the exposure material used for the produc- IlOIl of radiographs by means of invisible radiation such 15 alpha, beta, gamma, and X-rays is a material which :omprises at least one silver halide emulsion layer con- :aining at least two color couplers for color forming delelopment which couple with the oxidation products of a primary aromatic amino developing agent with different reaction velocities to form dyes. It is found in this case :hat the color coupler which couples more quickly is the irst to react and that gradually as the concentration of his component decreases, the second color component also reacts with the excess of the oxidised developer.
  • the colors of the dyes formed by coupling can be laried within wide limits. For example, for the reproiuction of highlights (light portions of the radiograph) ICC it is possible to use red or yellow dyes, while blue or magenta dye shades are used for the reproduction of the shadows (dark portions).
  • Suitable couplers with relatively high coupling speed are for instance those of the acylacetamide type. Such compounds correspond for instance to the following formula:
  • magenta color couplers of relatively high coupling speed are the following:
  • color couplers with relatively low coupling speed are phenols and a-naphthols which contain replaceable groups in the coupling position (that is to say in para-position to the hydroxy group) such as sulfonic acid groups or halogen atoms, e.g. a chlorine or bromine. Further examples of such
  • the total amount of the above color couplers added to a silver halide emulsion of 40-60 g. silver content is about 5 to 25 g., preferably to 20 g. per kg. of emulsion.
  • the relative amount of the color couplers may vary within wide limits; proportions by weight between 1: 10 and 10:1 have been found particularly suitable.
  • the color coupler may be incorporated in a water permeable, water insoluble solvent as disclosed for instance in U.S. patent specifications 2,304,940 and 2,322,- 027 before they are added to the silver halide emulsion.
  • Example 1 velopment, bleaching and fixing, an image is obtained which has pink color shades at the light portions and blue color shades at the dark portions.
  • the ordinary color forming developing solutions containing a primary aromatic amino compound such as N-hydroxy-N-ethyl-p-amino-aniline as developing agent for the processing of the film there may be used.
  • Example 2 120 cc. of a 5% solutionof a-stearyl-succionyl-5-aminoindazolone in aqueous sodium hydroxide solution with a final pH value of about 9, and 80 to 120 cc. of a 5% solution of 3-(p-stearoylarninobenzoylacetamido)-isophthalic. acid in aqueous sodium hydroxide solution with a final pH value of about 9, are added to 1 kg. of a highly sensitive silver halide emulsion with the conventional additives.
  • the processing takes place as in Example 1 and yellow color tones are obtained at the lightly exposed areas and red color tones at the strongly exposed areas. It the yellow coupler is replaced by 4 g. of l-hydroxy-Z- naphthoyl 2' L N methyloctadecylamino 5 sulfoanilide there result radiographs which are cyan in the lightly exposed areas and magenta at the strongly exposed areas.
  • the above indazolone coupler is contained as follows: A solution of 5.2 g. of S-aminoindazolonehydrochloride (Berichte 75 (.1942), page 1107), and 9 g..ofioct-adec'enylsuccinic acid anhydride in 35 cc. of pyridine is refluxed for two, hours and thereafter added to a mixture of 350 cc. of water and 35 cc. of concentrated hydrochloric acid. The precipitate fonmed'is sucked off and washed with acetone and methanol.
  • Example 3 4 g. of 1-(4f-phenoxyphenyl-3-sulphonic acid)-3-heptadcyl-S-pyrazolone and 6 g. of 1-hydroxy-4-sul'pho-2 naphthoylamino-2'-methyl-stearylamino-5f-sulphonic acid are added'in the same way asrin Example 1 to 1 kg. of a highly sensitive silver halide emulsion with the usual additives and then processed as in Example 1. Red color tones are obtained in the highlights and blue color tones in the shadows.
  • the second coupler is obtained by treating l-hydroxy- 2 naphthoyl 2' N methyl octadecylamino 5- sulfoanilide with 10 cc. of concentrated sulfonic acid at 60 C. until the reaction product has become water soluble.
  • Example 4 4 g. of 1-(4'-sulfopheny1)-3-heptadecyl-5-pyrazolone and 6 g. of 1hydroxy-4-sulpho-2-naphthoyl-stearyl-amine are added in the same way as in Example 1 to 1 kg. of a highly sensitive emulsion with the usual additives and processed as in Example 1. Red color tones are obtained in the highlights and blue color tones in the shadows.
  • Example 5 12.5 g. of the cyan coupler disclosed in Exampled are added to 1 kg. of a highly sensitive silver halide emulsion. This emulsion is coated on a transparent film support to produce a layer of about 7,44 thickness. On this layer and on the backside of the support there are coated silver halide emulsions, which contain per kg. 5 g'. of the indazolone and 4 g. of the yellow coupler of Example 2. After exposure by means of X-rays this material is processed in the same manner as disclosed in Example 1. The radiograph is yellow in the areas of small exposure, red in the areas of medium exposure and black in the strongly exposed areas.
  • Example 6 A highly sensitive silver halide emulsion containing per kg. 6 g. of the indazolone and 6 g. of the yellow coupler of Example 2 is coated on a transparent film support to produce a layer of 0.015 mm. thickness. On the backside of said support there is coated the same emulsion containing per kg. 10 g. of the yellow coupler of Example 2 and 3 g. of the cyan coupler of Example 1 to produce a layer of- 0.015 mm. thickness. After exposure by means of X-rays this material is processed in the same manner as disclosed in Example 1. The radiograph obtained is yellow in the areas of small exposure, red in the areas of medium exposure and olive-green in the strongly exposed areas.
  • the materials of the present invention may also be processed to positive images by the reversal process according to well known practices.
  • a process for the production of radiographs with invisible actinic rays which comprises exposing to said rays a silver halide emulsion layer containing at least two color couplers which couple at different reaction velocities with the oxidation products of the same color forming primary amine developed to form differently colored dye images, the coupler of higher coupling velocity being selected from the group consisting of acylacetamides, 5-pyrazolones, and alpha-'naphthols' which are not substituted in para-position to the phenolic hydroxy group; and the coupler of lower coupling velocity being an alphanaphthol which contains in para-position to the hydroxy group a substituent which is split off during development, said substituent being selected from the class of halogen atom and a sulfonic acid group, said different reaction velocities being such that development of said layer with said developer forms a color image in which the shadows have different color shades than the highlights, and processing said exposed material in such a developer to produce a radio
  • a photographic material comprising a silver halide emulsion layer containing at' least two color couplers which couple at difierent reaction velocities with the oxidation products of the same primary amine color forming developer at exposed portions of the layer to form dye images of difierent color shades, the coupler of higher coupling velocity being selected from the group consisting of acylacetamides, 5-pyrazolones, and alphanaphthols which are not substituted in para-position to the phenolic hydroxy group; and the coupler of lower coupling velocity being an a'l-phanapthol which contains in para-position to the hydroxy group a substituent which is split off during development, said substituent being selected from the class of a halogen atom and a sulfonic acid group, said reaction velocities being sufiiciently different that after exposure, the development of said layer with such developer produces a color image having shadows with different color shades than the highlights.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
US681892A 1956-09-26 1957-09-04 Color radiography Expired - Lifetime US2994610A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA25750A DE1046495B (de) 1956-09-26 1956-09-26 Verfahren zur Herstellung von Roentgenaufnahmen

Publications (1)

Publication Number Publication Date
US2994610A true US2994610A (en) 1961-08-01

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ID=6925981

Family Applications (1)

Application Number Title Priority Date Filing Date
US681892A Expired - Lifetime US2994610A (en) 1956-09-26 1957-09-04 Color radiography

Country Status (6)

Country Link
US (1) US2994610A (fr)
BE (1) BE561008A (fr)
CH (1) CH360898A (fr)
DE (1) DE1046495B (fr)
FR (1) FR1183244A (fr)
GB (1) GB842222A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3235728A (en) * 1961-03-10 1966-02-15 Agfa Ag Color radiography
US4212936A (en) * 1977-11-25 1980-07-15 Minnesota Mining And Manufacturing Company Color contrast radiographic film
US4315069A (en) * 1979-09-18 1982-02-09 Ciba Geigy Ag Color coupler combination

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3450536A (en) * 1961-03-24 1969-06-17 Eg & G Inc Silver halide photographic film having increased exposure-response characteristics
JPS4943887B1 (fr) * 1970-12-08 1974-11-25
US5430308A (en) * 1993-10-27 1995-07-04 Accuray, Inc. 3-dimensional radiation dosimeter

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2159600A (en) * 1936-02-06 1939-05-23 Veracol Film Syndicate Ltd Production of composite photographic images
US2186736A (en) * 1937-07-03 1940-01-09 Agfa Ansco Corp Coupling compounds for color forming development
US2224329A (en) * 1936-10-31 1940-12-10 Gen Aniline & Film Corp Color photography
GB626979A (en) * 1945-11-19 1949-07-25 Republic Pictures Corp Improvements in color photography
US2542716A (en) * 1945-07-16 1951-02-20 Gen Aniline & Film Corp Multicolor diazotype layers
US2542715A (en) * 1945-07-16 1951-02-20 Gen Aniline & Film Corp Multicolor diazotype layers
US2644096A (en) * 1948-02-25 1953-06-30 Radiograph Dev Corp Color radiography
US2689793A (en) * 1953-03-13 1954-09-21 Eastman Kodak Co Controlling grain and contrast in color photography
US2698794A (en) * 1950-04-15 1955-01-04 Eastman Kodak Co Mixed packet photographic emulsions
US2793118A (en) * 1952-08-13 1957-05-21 Grinten Chem L V D One component diazotype material containing at least two light sensitive diazocompounds

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE453303A (fr) * 1942-11-25

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2159600A (en) * 1936-02-06 1939-05-23 Veracol Film Syndicate Ltd Production of composite photographic images
US2224329A (en) * 1936-10-31 1940-12-10 Gen Aniline & Film Corp Color photography
US2186736A (en) * 1937-07-03 1940-01-09 Agfa Ansco Corp Coupling compounds for color forming development
US2542716A (en) * 1945-07-16 1951-02-20 Gen Aniline & Film Corp Multicolor diazotype layers
US2542715A (en) * 1945-07-16 1951-02-20 Gen Aniline & Film Corp Multicolor diazotype layers
GB626979A (en) * 1945-11-19 1949-07-25 Republic Pictures Corp Improvements in color photography
US2644096A (en) * 1948-02-25 1953-06-30 Radiograph Dev Corp Color radiography
US2698794A (en) * 1950-04-15 1955-01-04 Eastman Kodak Co Mixed packet photographic emulsions
US2793118A (en) * 1952-08-13 1957-05-21 Grinten Chem L V D One component diazotype material containing at least two light sensitive diazocompounds
US2689793A (en) * 1953-03-13 1954-09-21 Eastman Kodak Co Controlling grain and contrast in color photography

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3235728A (en) * 1961-03-10 1966-02-15 Agfa Ag Color radiography
US4212936A (en) * 1977-11-25 1980-07-15 Minnesota Mining And Manufacturing Company Color contrast radiographic film
US4315069A (en) * 1979-09-18 1982-02-09 Ciba Geigy Ag Color coupler combination

Also Published As

Publication number Publication date
GB842222A (en) 1960-07-20
FR1183244A (fr) 1959-07-03
BE561008A (fr)
CH360898A (de) 1962-03-15
DE1046495B (de) 1958-12-11

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