FR2554935A1 - COMPOSITION TO REVEAL COLOR PHOTOGRAPHS - Google Patents

Abstract

DEVELOPER FOR THE DEVELOPMENT OF COLOR PHOTOGRAPHS OF THE TYPE INCLUDING IN SOLUTION: -A DEVELOPER; -AN ACCELERATOR; -A CONSERVATIONIST; -AN ANTI-SAIL; CHARACTERIZED IN THAT THE DEVELOPER IS CONSTITUTED BY A MIXTURE OF A FIRST KNOWN CD DEVELOPER FOR COLOR PAPER DEVELOPMENT AND A SECOND KNOWN CD TYPE DEVELOPER FOR COLOR FILM DEVELOPMENT.

Description

COMPOSITION FOR REVEALING COLOR PHOTOGRAPHS.

  The invention relates to a novel composition for

  reveal the photographs in color.

  As is known, a sensitive paper intended to be impressed by a color photographic film essentially comprises three sensitive layers, namely generally in the order from the bottom upwards: - the support paper,

  - a layer of yellow dye sensitive to light

blue re,

  - a layer of magenta dye sensitive to

  green, - a layer of cyan dye sensitive to red light, each of these sensitive layers being separated

between them with gelatin.

  To reveal such encumbering photographs, compositions called "developers" are used which essentially comprise: a solvent, which is generally water; a developer for reducing the silver halide of the sensitive paper; an accelerator, such as, for example, sodium carbonate, intended to neutralize the acid liberated by the

  reduction of the silver halide, since the development

  can only take place in a basic environment;

  - a preservative or preservative, such as for example

  Sodium sulphite intended to prevent oxidation of the developer in contact with air; an antifoggant, most often bromide or potassium iodide, in order to avoid the appearance of a more or less pronounced veil on the developed image,

  veil from the reduction of halogen crystals

Nure of money not insolated.

  As "developer", organic reducing-reducing bodies, generally cyclic, having at least two phenol groups (diphenol), or two amino groups (diamine) or these two groups (amino-phenol) are used. Nevertheless, although the theoretical number of compounds likely to be used is relatively

  In practice, it is only used

some of these compounds.

  These chromogenic developers have been classified by use in various categories referenced CD

  (color developer). The oldest developers

  were designated CD1. The most recent ones for the development

  on paper, color photographs are

CD3.

  The category CD2 includes in particular N, N diethyl-

  p-tolylenediamine chlorohydrate or 2-amino-5-diethy-

laminotoluene hydrochloride.

  On the other hand, the CD3 category

  4-amino-N-ethyl-N (-methylsulfonamidoethyl) -m-

  toluidine sesquisulfate monohydrate, phosphate of the same

  compound, N-ethyl-N- (6-methylsulfonaminoethyl) -p-

  methyl-1-phenylenediamine sesquisulphonate monohydrate

  or N-ethyl-N- (Amethylsulfanimoethyl) -p-toluenediol

mine.

  Thus, for several years, we know a

  revealing position called EP 2, in which the development

  The loppator is of the CD3 type. This composition gives

  these results under the current conditions of

  implementation and productivity for development on paper.

  Recently, we have seen the emergence of

  automatic development techniques for color photographs, in which the processing is carried out

  more in a few hours, but only in a few minutes

  you, even on an ad hoc basis. The developers of the CD3 type trade proved to be insufficient. Indeed, if to improve productivity, we seek to

  modify any of the essential characteristics

  the treatment, such as for example to reduce the duration of the residence time of the insolated paper sheet

  in the revealing composition, or to increase the tempera-

  temperature, or to modify the concentration, one then causes a chromatic imbalance, also called "color balance", because one acts differently on the three layers

sensitive paper to develop.

  In the current industrial conditions of

  development and using CD3-type developers, satisfactory paper results are obtained with treatment times of at least ten minutes and a bath temperature close to 30 C. However, for the most recent development materials, this duration is still considered too important. It was then suggested to increase the temperature from 30 to 40 C. This certainly makes it possible to shorten the treatment cycle of a third

  approximately, but sometimes the risk of imbalance

  free chromatic due to the lack of development of the yellow layer. Finally, this

  even shorter duration is still too long for

  what would be achieved by the most

  cent for rapid development on photo paper

color graphics.

  In short, in the current state of things, the speed and quality performances that can be achieved by

  the most effective material for developing pho-

  ongraphies on paper are considerably limited

  by the developers of the market, particularly those

type CD3.

  -At the same time, we also know a development

  CD4, which is used for the development of unwanted papers, but that of photographic

themselves also in color.

  As marketed CD4 developers, mention may be made of ethylhydroxyethyl-p-phenylenediamine sulphate,

  the homologue derived from the m-toluidine sesquisul-

  monohydrate, 4-amino-3-methyl-N- (ohydroxyethyl) aniline sulfate,

  4-ethyl-N- (2-hydroxyethyl) -2-methyl-1,4-

  phenylenediamine sulfate monohydrate.

  These CD4 compounds give excellent results

  for the development of photographic films in

  their. On the other hand, for the development of color photogra phies on impressed papers, at least

  under the current conditions of treatment, these

  CD4 products generally lead to

  better comparable to those obtained with the development of

  type CD3. In short, these compounds are also limited

in speed.

  The invention overcomes these disadvantages. It relates to

  a developer for development on photo paper

  color graphs that reduce the processing time by almost half and thereby be compatible

  with the technical performance of the automatic

  the most modern development projects, without

  the other indispensable qualities of the photographic

  phies, such as contrast, chromatic balance,

  the veil is not affected significantly.

  This revealer for the development on paper of

  color photographs of the type comprising in

  - a developer, - an accelerator, - a preservative, - an antifoggant, is characterized in that the developer is constituted by a mixture of a first developer-5-color-type CD3 and a second developer for

color films type CD4.

  Advantageously, in practice: the developer CD3 is chosen from the group consisting of 4-amino-N-ethyl-N- (methylsulfonamidoethyl) -mtoluidine sesquisulfate monohydrate, 4-amino-N-ethyl-N- (methylsulfonamidoethyl) ) -m-toluidine

  phosphate, N-ethyl-N (/ -methylsulfonamidoethyl) -p-

  methyl-1,4 phenylenediamine sesquisultionate monohydrate,

  and N-ethyl-N- (methylmethylsulfaminoethyl) p-toluenediol

mine;

  the CD4 type developer is selected from the group

  pe constituted by ethylhydroxyethyl-p-phenylenediamine

  sulfate, the homologue derived from m-toluidine sesquisul-

  fate monohydrate, 4-amino-3-methyl-N- (hydroxyethyl) -

  aniline sulfate, 4-ethyl-N- (2-hydroxyethyl) -2-methyl-

  1,4-phenylenediamine sulfate monohydrate; the proportion by weight of CD4 developer relative to the weight of CD3 is between 2 and 4 and preferably between 2.3 and 3.5; the revealing composition comprises for 13.5 liters between 75 and 85 grams of CD3 and between 185 and

  225 grams of CD4; if the proportion of CD4 is lower than

  more than 185 grams, in addition to chromatic imbalance

  already crippling, it will be necessary to compensate

  duration of treatment, which goes against the desired objective; moreover, if the proportion in CD4 is greater than 225 grams, the yellow shade

  will increase, which will lead to a break in the balance

  chromatic color; in addition, the whites will be veiled, which will then force to add anti-sails, so to increase the price of the composition; the development is carried out at a temperature

between 37 and 40 C.

  The manner in which the invention can be realized and the advantages which derive therefrom will emerge more clearly from the following exemplary embodiments given as

indicative and not limiting.

Example 1:

  A known composition is prepared in a known manner.

  latrice currently widely used for

  EP2 contains in grams: - seventy nine (79) grams of a CD3 developer marketed by Hunt Chemicals of formula:

  4-amino-N-ethyl-N- (1-methylsulfonaminoethyl) -m-toluene

  phosphate; - and as other constituents: sodium bromide (antifoggant): 7.9 g, benzyl alcohol (swelling of gelatin): 270 g, sodium sulphite (preservative): 9.3 g, ethylene glycol (solvent): 93 g ,

potassium carbonate (accelerates

  nitrogen): 418 g, 20. ammonium hydroxide: 61.2 g, lithium chloride: 32.5 g,

phosphoric acid: 9.3 g.

  The dilution of the whole is completed by

  water to bring the volume to 13.5 liters. The appropriate pH

  Approximately, this composition is close to 10.

  The mixture of the various components is carried out in a known manner progressively and under usual conditions, in order to ensure the perfect missibility of the various constituents and to mitigate the toxic effects.

some of them.

  This composition is used to develop a

  color paper impressed witness. It operates at 40 C.

  After at least one hundred seconds of treatment, we obtain a good chromatic balance, a good density and a

good development.

- 7-

Example 2

  Example 1 is repeated, replacing the developer CD3 with a CD4 type developer of the general formula: 4-amino-3-methyl-N- (P-hydroxyethyl) -aniline sulfate also marketed by Hunt Chemicals. After another hundred seconds of processing, the paper photographs thus

  density most often considered unsatisfactory and over-

  all a clear chromatic imbalance in the blue.

  Example 3: Example 1 is repeated by adding, at room temperature, to the composition one hundred eighty five (185)

  grams of the same CD4 developer as in Example 2.

  By operating also at 40 C, the duration of the

  processing from one hundred seconds to fifty seconds

  while maintaining an excellent chromatic balance

  tick, good density and good contrast.

Example 4

  Example 3 is repeated adding not more than 185 g, but one hundred and seventy (170) grams of the same compound

  CD4. After development and drying, we get a bad

  go chromatic balance, with drop of the layer

  sensitive to blue, which results in underdeveloped

prohibitive.

  Example 5: Example 3 is repeated, but using not g of this CD4, but two hundred and thirty (230) grams of

  this compound. There is also a chronic imbalance

  resulting from the rise of the blue color,

  which results in overdevelopment also red-

hibitoire.

Example 6

  Example 3 is repeated replacing the developer

  CD4 by another CD compound of formula: 4-ethyl-N-

  (2-hydroxythyl) -2-methyl-4-phenylenediamine sulfate (2-hydroxyethyl) -2-methyl-1,4-phenylenediamine sulfate monohydrate.

  An excellent chromatic balance is also obtained.

  tick, good density and good contrast after

  only fifty (50) seconds of treatment.

  Thus (see examples 3 and 6), the combination of two

  known developing agents, one CD3 for the development of

  the other CD4 for the photographic films themselves in color, makes it possible, quite unexpectedly, to reduce by almost half the duration of the treatment of these photographs and this, without influencing the other properties. This result is all the more surprising since each compound taken alone (Examples 1 and 2) required a treatment duration of more than twice and led to

  properties (density, contrast, chromatic

  lower). This shows that there was syner-

  between the two developers, a synergy which is

  unpredictable or clearly

  liorés. Moreover, and above all, this combination makes it possible to successfully solve a problem which arises for the rapid development on paper of

  colors. Advantageously, these developers allow

  achieve the performance required by the most modern equipment and thereby increase the

productivity.

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Claims (6)

  1 / developer for the development of color photographs of the type comprising in solution: - a developer, - an accelerator, - a preservative, - an anti-veil, characterized in that the developer consists of a mixture of a first developer CD3 type known for development on color paper and a second CD4 type developer known for the development of color films.   2 / developer according to claim 1, characterized in that the developer CD3 is selected from the group   consisting of 4-amino-N-ethyl-N- (methylsulfonamido)   ethyl) -m-toluidine sesquisulfate monohydrate, 4-amino-   N-ethyl-N- (methylsulfonamidoethyl) -m-toluidine phospha-   te, N-ethyl-N- (1-methylsulfonaminoethyl) -p-methyl-   1,4 phenylenediamine sesquisfulfonate monohydrate, and N-ethyl-N- (methylsulfaminoethyl) -p-toluediamine; 3 / developer according to claim 2, characterized   in that the CD3 type developer is 4-amino-N-   ethyl-N- (methanesulfonamidoethyl) -m-toluidine phos-   phate. 4 / developer according to claim 3, characterized in that the developer type CD4 is chosen in the   group consisting of ethylhydroxyethyl-p-phenylenedia-   sulfate, the homologue derived from m-toluidine   quisulfate monohydrate, 4-amino-3-methyl-N- (hydro-   xyethyl) -aniline sulfate, 4-ethyl-N- (2-hydroxyethyl) -   2-methyl-1,4-phenylenediamine sulfate monohydrate.   / Developer according to claim 4, characterized   in that the CD4 type developer is 4-amino-3-   methyl-N- (hydroxyethyl) aniline sulfate.   6 / developer according to one of claims 1 to 5, - 10 -   characterized in that the weight proportion of CD4 based on the weight of CD3 is between 2 and 4, and preferably between 2.3 and 3.5.   7 / developer according to claim 6, characterized in that for 13.5 liters, it comprises between seventy five and eighty five grams of CD3 and between one hundred and eighty five and two hundred and twenty five grams of CD4.   8 / Developer comprising thirteen liters and a half in solution in water: - 9.3 grams of sodium sulphite, - 418 grams of potassium carbonate, - 7.9 grams of sodium bromide, - 270 grams of alcohol benzyl, - 51 grams of hydroxy-ammonium sulfate, - 32.5 grams of lithium chloride, - 9.3 grams of phosphoric acid,   - 79 grams of a CD3 developer of formula   4-amino-N-ethyl-N- (methylsulfonaminoethyl) -N- toluidine phosphate and,   100 grams of a CD4-type developer of   4-amino-3-methyl-N- (hydroxyethyl) aniline sulfate.   9 / Composition according to one of claims 1 to 8,   characterized in that it is used at a tempera- between 37 and 40 degrees C.