US2639219A - Noncaking potassium bromide for photographic developers - Google Patents

Noncaking potassium bromide for photographic developers Download PDF

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Publication number
US2639219A
US2639219A US279208A US27920852A US2639219A US 2639219 A US2639219 A US 2639219A US 279208 A US279208 A US 279208A US 27920852 A US27920852 A US 27920852A US 2639219 A US2639219 A US 2639219A
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United States
Prior art keywords
potassium bromide
caking
noncaking
photographic developers
photographic
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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US279208A
Inventor
Edwin S Wiitala
William J Rogers
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.)
Eastman Kodak Co
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Eastman Kodak Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to US279208A priority Critical patent/US2639219A/en
Priority to FR1073276D priority patent/FR1073276A/en
Priority to GB8537/53A priority patent/GB726108A/en
Application granted granted Critical
Publication of US2639219A publication Critical patent/US2639219A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D3/00—Halides of sodium, potassium or alkali metals in general
    • C01D3/26—Preventing the absorption of moisture or caking of the crystals
    • 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
    • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
    • G03C5/264—Supplying of photographic processing chemicals; Preparation or packaging thereof
    • G03C5/265—Supplying of photographic processing chemicals; Preparation or packaging thereof of powders, granulates, tablets

Definitions

  • This invention relates to the prevention of oaking of potassium bromide, and more particularly to potassium bromide in which a desiccating agent which is compatible with photographic developers has been incorporated. Such agents impart non-caking properties to the potassium bromide.
  • Potassium bromide is an important component of most photographic developers and acts essenbromide from which a component part is to be selected to be added to the developer mixture has to be broken up, granulated and screened. In fact, certain lots have been found to be so badly caked that they have been totally rejected for use.
  • An object of the present invention is, therefore, to provide a non-caking potassium bromide which i suitable for employment in photographic developer mixtures.
  • Another object of the invention is to provide a method of producing a non-caking potassium bromide.
  • a desiccating agent including one or more of the following boron compounds, boric anhydride (B203) metaboric acid and orthoboric acids, have marked effect upon reducing the caking of potassium bromide.
  • a desiccating agent including one or more of the following boron compounds, boric anhydride (B203) metaboric acid and orthoboric acids.
  • B203 boric anhydride
  • orthoboric acids have marked effect upon reducing the caking of potassium bromide.
  • the desiccating agent may be mixed together in any suitable manner.
  • Quantities of desiccating agent in an amount as small as /2% of the weight of potassium bromide is efiective in preventing caking.
  • Example 1 The advantages of the invention can be demonstrated as follows: A sample of line granular, mesh, potassium bromide and a similar sample containing 0.05% B203 were conditioned at F. for a week with intermittent heating and cooling to room temperature. The untreated sample was caked and slightly discolored by this heating. The sample containing the B203 addition was found to be perfectly free flowing and to be unchanged in appearance.
  • Example 2 The procedure of Example 1 was repeated except that 1% by weight of boric anhydride was employed to overcome the caking tendency of the potassium bromide. As in the first example, the untreated sample caked but the treated sample was free flowing.
  • Example 3 The same procedure as in Example 1 was fol- Example 4 The same procedure as in Example 1 was followed, except for the substitution of /g% orthoboric (H3803) for the boric anhydride.
  • the potassium bromide containing the orthoboric acid was free flowing, while the check sample of straight potassium bromide was moderately caked.
  • Our invention is a desirable contribution to the photographic developing art in that it permits saving of .materlalsand enables potassium bromide to be handled and combined with other components of the photographic developers more easily.
  • a finely divided non-caking potassium bromide composition containing as an anti-caking agent 0.05% to 10% by weight of a compound selected from the group consisting of boric anhydride, metaboric acid and orthoboric acids.
  • A. finely divided non-caking potassium bromide composition containing as an anti-caking agent 0.05% to 10% by weight of boric anhydride.
  • a finely divided non-caking potassium bromide composition containing as an anti-caking agent 0.05% to 10% by weight of metaboric acid.
  • a finely divided non-caking potassium bro- 3 '4 mide composition containing as an anti-caking agent 0.05% to 10% by weight of orthoboric acid References Cited in the file of this patent 5.
  • the method of preventing caking Of finely UNITED STATES PATENTS divided potassium bromide which comprises mixing therewith a small amount of a non-caking 5 2 222 gsg a1 g g agent selected from the grou consisting of bone 2,477,323 Wood July 1949 anhydride, metaboric acid and orthoboric acid.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

Description

Patented May 19, 1953 UNITED: sTAres NoNoAKiNo ro-mssmkfjiiadsiififi.iioitz, PHOTOGRAPHIO DEYELoPERs.
Edwin S. Wiitala and William J.- Rogers, Itocl ester, N. Y., assignors to EastmanKodak'Coni: pany, Rochester, N. Y., a eel-pariah of'i'New Jersey N Drawing. Application March 28, 1952, Serial No. 279,208
6 Claims.
This invention relates to the prevention of oaking of potassium bromide, and more particularly to potassium bromide in which a desiccating agent which is compatible with photographic developers has been incorporated. Such agents impart non-caking properties to the potassium bromide.
Potassium bromide is an important component of most photographic developers and acts essenbromide from which a component part is to be selected to be added to the developer mixture has to be broken up, granulated and screened. In fact, certain lots have been found to be so badly caked that they have been totally rejected for use.
An object of the present invention is, therefore, to provide a non-caking potassium bromide which i suitable for employment in photographic developer mixtures.
Another object of the invention is to provide a method of producing a non-caking potassium bromide.
In accordance with the invention we have discovered that the addition of small. quantities of a desiccating agent, including one or more of the following boron compounds, boric anhydride (B203) metaboric acid and orthoboric acids, have marked effect upon reducing the caking of potassium bromide. lhe potassium bromide and the desiccating agent may be mixed together in any suitable manner. Quantities of desiccating agent in an amount as small as /2% of the weight of potassium bromide is efiective in preventing caking. We have found that such small amounts of these desiccating agents when introduced into the developer formulations have no effect .upon the photographic properties of the developer. Slight changes in the alkalinity of the developer formulation produced by the presence of these boron compounds can be adjusted by a minor adjustment of the alkaline component of the mixture. While these boron compounds in an amount of /3 to 1% of the weight of potassium bromide to be treated is preferred, amounts up to could be advantageously employed.
The invention will be further illustrated in the following examples:
Example 1 The advantages of the invention can be demonstrated as follows: A sample of line granular, mesh, potassium bromide and a similar sample containing 0.05% B203 were conditioned at F. for a week with intermittent heating and cooling to room temperature. The untreated sample was caked and slightly discolored by this heating. The sample containing the B203 addition was found to be perfectly free flowing and to be unchanged in appearance.
Example 2 The procedure of Example 1 was repeated except that 1% by weight of boric anhydride was employed to overcome the caking tendency of the potassium bromide. As in the first example, the untreated sample caked but the treated sample was free flowing.
Example 3 The same procedure as in Example 1 was fol- Example 4 The same procedure as in Example 1 Was followed, except for the substitution of /g% orthoboric (H3803) for the boric anhydride. The potassium bromide containing the orthoboric acid was free flowing, while the check sample of straight potassium bromide was moderately caked.
Our invention, therefore, is a desirable contribution to the photographic developing art in that it permits saving of .materlalsand enables potassium bromide to be handled and combined with other components of the photographic developers more easily.
What we claim and desire to secure by Letters Patent or the United States is:
l. A finely divided non-caking potassium bromide composition containing as an anti-caking agent 0.05% to 10% by weight of a compound selected from the group consisting of boric anhydride, metaboric acid and orthoboric acids.
2. A. finely divided non-caking potassium bromide composition containing as an anti-caking agent 0.05% to 10% by weight of boric anhydride.
3. A finely divided non-caking potassium bromide composition containing as an anti-caking agent 0.05% to 10% by weight of metaboric acid.
4. A finely divided non-caking potassium bro- 3 '4 mide composition containing as an anti-caking agent 0.05% to 10% by weight of orthoboric acid, References Cited in the file of this patent 5. The method of preventing caking Of finely UNITED STATES PATENTS divided potassium bromide which comprises mixing therewith a small amount of a non-caking 5 2 222 gsg a1 g g agent selected from the grou consisting of bone 2,477,323 Wood July 1949 anhydride, metaboric acid and orthoboric acid.
6. The method of preventing caking of finely divided potassium bromide which comprises mixing therewith to 1% by weight of boric an- 10 hydride.
EDWIN S. WIITALA. WILLIAM J. ROGERS.

Claims (1)

  1. 5. THE METHOD OF PREVENTING CAKING OF FINELY DIVIDED POTASSIUM BROMIDE WHICH COMPRISES MIXING THEREWITH A SMALL AMOUNT OF A NON-CAKING AGENT SELECTED FROM THE GROUP CONSISTING OF BORIC ANHYDRIDE, METABORIC ACID AND ORTHOBORIC ACID.
US279208A 1952-03-28 1952-03-28 Noncaking potassium bromide for photographic developers Expired - Lifetime US2639219A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US279208A US2639219A (en) 1952-03-28 1952-03-28 Noncaking potassium bromide for photographic developers
FR1073276D FR1073276A (en) 1952-03-28 1953-03-26 Process for preventing the agglomeration of pulverulent potassium bromide and new products obtained by its implementation
GB8537/53A GB726108A (en) 1952-03-28 1953-03-27 An improved non-caking potassium bromide composition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US279208A US2639219A (en) 1952-03-28 1952-03-28 Noncaking potassium bromide for photographic developers

Publications (1)

Publication Number Publication Date
US2639219A true US2639219A (en) 1953-05-19

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US279208A Expired - Lifetime US2639219A (en) 1952-03-28 1952-03-28 Noncaking potassium bromide for photographic developers

Country Status (3)

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US (1) US2639219A (en)
FR (1) FR1073276A (en)
GB (1) GB726108A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3048470A (en) * 1958-03-12 1962-08-07 Basf Ag Free-flowing ammonium chloride

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4816384A (en) * 1986-10-09 1989-03-28 E. I. Du Pont De Nemours And Company Powdered packaged developer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2313523A (en) * 1940-06-18 1943-03-09 Eastman Kodak Co Photographic material
US2477323A (en) * 1945-07-02 1949-07-26 Harris Seybold Potter Co Photographic developers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2313523A (en) * 1940-06-18 1943-03-09 Eastman Kodak Co Photographic material
US2477323A (en) * 1945-07-02 1949-07-26 Harris Seybold Potter Co Photographic developers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3048470A (en) * 1958-03-12 1962-08-07 Basf Ag Free-flowing ammonium chloride

Also Published As

Publication number Publication date
GB726108A (en) 1955-03-16
FR1073276A (en) 1954-09-21

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