US2197017A - Fine grain photographic developer - Google Patents

Description

Patented A r. 16, 1940 ma cam rnorocnarmo navnnoran William H. Wood, more, om, mlto Harris- Seybold-Potter Company, Ohio, a corporation of Delaware Cleveland,

No Drawing. Application May 1'2, loss. a Serial No. 274,225

1'4 Claims. 501. 95-) It has been suggested to employ ethanolamine salts in developers, for supplying desired weak alkalinity or for assisting the action of fine grain developers, but these combinations havesuch a tendency to generation of developing-fog" as to preclude practical utility. I have now found however that if the compounds set forth in my co-pending application Serial No. 270,922, viz. compounds from the class consisting of reaction products of morpholine andsulphur dioxide, which for convenience I will referto herein. as

morpholine sulphite and morpholine bisulphite or generically as sulphites of morpholine, be incorporated in compositions with hydroxyaliphatic amine salts, the surprising effect results that there is an inhibiting of developing-fog, and there is enhancement of fine grain developer action'obtainable. Peculiarly, I'furthermore have found that when a sulphite of morpholine is incor- Il porated in a paraplienylenediamineglycin type of developer itis possible to apply larger proportions of ethanolamine salts or the like than when the sulphite ,of morpholine is not present. further makes it possible to reduce the proportion of 18' glycin in, the developer while maintaining the desired rate of activation of the developing agent paraphenylenediamine with resultant further increase in fineness of grain. Especially advantageous control thus of amine salts may be had.

80 To the accomplishment of the foregoing and related ends, the invention, then, comprises the features-hereinafter fully described, and particularly pointed out in the claims, the following description setting forth in detail certain illus- 05 trative embodiments of the inventiomthese being indicative however, of but a few of the various ways in which the principle of the invention may be employed. I v

The salts of the hydroxyaliphatic amines which 40 may beemployed are for instance those of monotions of these salts for results desiredmay be 50 employed in the developing composition, considerable variation being permissible depending upon the type and amount of developing agent and otherconstituents employed, and-upon the nature of the results desired. For'instance, 0.01 to 2 55 grams of the hydroxyaliphatic amine salt per each '100 cc. 6r developer solution may in general beemployed.

The proportions of the sulphites of morpholine suitable in this use are in general about 0.1 to 2 grams oi morpholine sulphite for each 100 cc. of 5 developer solution.

An illustrative example of a fine grain developer in accordance with the invention is as follows:

Grams l0 Glycin 2 Paraphenylenediamine 18 Morpholine sulphite Q 40 Potassium bromide 0.5 Ethanolamine sulphite. 20 ll Sodium sulphite 80 The foregoing per each 1000 of water.

stated, and is preferred, the proportion of this constituent may be varied to higher amounts. A particularly small grain silver deposit is obtained, and there is a noticeable decrease in time required todevelop the given density. The deposit is supeg5 rior to that produced by ordinary physical development, and superior in density and contrast-to that obtained by the usual alkaline developers.

Other modes ofapplying the principle of the invention may be employed, change being made as regards the details described, provided the features stated in any of the following claims, or the equivalent of such, be employed.

I therefore particularly point out and distinctly claim as my invention:

1. In a process of preparing photographic images, incorporating in the developer paraphenylenediamine,v parahydroxyphenyl glycin, sodium sulphite, potassium bromide, mono-- ethanolamine sulphite and a sulphite of mor- 4o pholine. p

2-. In a process of preparing photographic images, incorporating in the developer paraphenylenediamine, parahydroxyphenyl glycin, 'sodium sulphite, potassium bromide, monoethanolaminephosphate and a sulphite of morpholine. 1

,3. In a process of preparing photographic images, incorporating in the developer paraphenylenediamine, parahydroiwphenyl glycin, sodium sulphite, potassium bromide, an inorganic salt of a hydroxyaiiphatic amine and asulphite .of morpholine.

4. In preparing photographic images, developing the image in the presence of paraphenylenediamine, monoethanolamine sulphite and a sulphite of morpholine.

5. In preparing photographic images, developing the image in the presence of paraphenylenediamine, monoethanolamine phosphate and a sulphite of morpholine. V

6. In preparing photographic images, developing the image in the presence of paraphenylenediamine, an inorganic salt of a hydroxyaliphatic amine, and a sulphite of morpholine.

7. In preparing photographic images, developing the image .in the presence of a silver halide developing agent and a sulphite-of morpholine and an inorganic salt of a hydroxyaliphatic fine grain type, monoethanolamine phosphate,

and a sulphite of morpholine.

10. In preparing photographic images, incorporating with a silver halide developing agent of fine grain type, an inorganic salt of a hydroxyaliphatic amine, and a sulphite of morpholine.

11. A photographic developer containing paraphenylenediamine, parahydroxyphenyl glycin,

sodium sulphite, potassium bromide, mono-'.

ethanolamine sulphite, and a sulphite of morpholine. v

12. A photographic developer containing paraphenylenediamine, parahydroxyphenyl glycin, sodium sulphite, potassium bromide, monoethanolamine phosphate, and a-sulphite of morpholine.

'13. A photographic developer containing paraphenylenediamine, parahydroxyphenyl glycin,

sodium sulphite, potassium bromide, an inorganic salt of a hydroxyaliphatic amine, and a sulphite of morpholine.

14. A photographic developer containing a silver halide developing agent and a sulphite of morpholine and an inorganic salt of a hydroxyaliphatic amine. l

. WILLIAM H. WOOD..