US2327813A

US2327813A - Photographic solution

Info

Publication number: US2327813A
Application number: US288178A
Authority: US
Inventors: Gale F Nadeau; William M Tucker
Original assignee: Eastman Kodak Co
Current assignee: Eastman Kodak Co
Priority date: 1939-08-03
Filing date: 1939-08-03
Publication date: 1943-08-24
Anticipated expiration: 1960-08-24

Description

Patented Aug. 24, 1943 UNITED STATE s PATENT OFFICE PHOTOGRAPHIC SOLUTION Jersey No Drawing. Application August 3, 1939, Serial'No. 288,178

Claims. (Cl. 95- -88) This invention relates to a process of decreasing the corrosiveness of photographic solutions which may have a tendency to attack metal parts. More particularly this invention relates to improved photographic solutions containing dyes and a method of treating the solution to eliminate or minimize the corrosiveness of such solutions.

In the production of various photographic materials in many instances solutions or suspensions of the materials may be flowed, sprayed or otherwise deposited on metal surfaces. Or, in other instances the various solutions containing coloring material or other ingredients may be applied in some manner to a film baseor other component of photographic film. It is wellknown that in some instances the solutions are I not chemically inert but may, for example, cor-.

may not only be corroded but such corrosion' causes the formation of sludges or slimes which may, unless care is taken, get into the product being fabricated.

We have found that the corrosiveness as above described, which may be present in certain photographic solutions, may be substantially stopped or considerably minimized by the incorporation therewith of certain agents, which apparently improve the properties of the solution from the corrosion standpoint without damaging the value of the solution for its photographic uses. Not only is it possible to use the solutions when in contact with more expensive metallic surfaces, but apparatus parts may be made out of nickel, tin and the like, when our invention is being employed.

This invention has for one object to provide an improvedphotographic solution which may be employed in contact with metallic parts without substantial attack thereof. Still another object is to provide a method of treating corrosive photographic solutions to substantially eliminate or at least-minimize the corrosiveness thereof. Still another object is to provide improved 7 photographtic solutions containing dyes or other coloring agents which may have a tendency to attack metallic parts, for substantially elimigraphic solution containing nigrosine dyes or related dyes which may be readily applied to a I film base without any attendant difliculty of sludge or slime incorporation. Still another object is to provide a method of minimizing the corrosive tendencies of aniline oxidation products. Still another object is to render corrosion, when it does occur, more uniform and without local pitting action. Other objects will appear hereinafter.

We have found that certain agents may be added to photographic solutions, suspensions or the like, which may have a tendency to attack metallic parts and such tendency substantially eliminated or considerably minimized. It is desired to point 'out that the solutions may contain various ingredients commonly encountered in photographic solutions as for example aliphatic alcohols, gelatin, resins, organic acids, cellulosic derivatives and dyes. In particular, we have. found that solutionscontaining colors such as dyes which are to be applied to film base or other parts of the film, may be treated by our invention so that they do not attack metal apparatus to any extent. Furthermore, the value of the dye containing photographic solution is not materially affected for its intended use.

We have found that if a small amount of amino alcohol, alkylol amine or substantially equivalent compound are suitably'incorporated with the solution, that many corrosive tendencies thereof may be minimized. In the case of ,of illustrating one specific application of our invention and not to be construed as a limitation thereof. v

In accordance with this example, it was desired to apply colors from an organic solution to a clue base and other negative bases. In particular, it was desired to apply ,a nigrosine dyecontaining solution to such film base. The solution in addition to the coloring agent such as nlgrosine dye may also contain organic solvents such as methanol, acetone and ethanol. In the previous employment of nigrosine dye solutions, metallic tanks containing the solution, the pipe lines conducting the solutions to the treatment of the film base had suffered attack and some difliculty had been experienced by sludges and slime formation,

We have found, however, that in accordance with the example under description about 1% by weight of diethylaminoethanol added to the nigrosine dye-containing photographic solution substantially reduced the attack thereof on metal parts. In the case of parts constructed of nickel, the attack thereon was practically totally stopped. Similar remarks apply to parts constructed of stainless steel or plated with chromium, rhodium or other related metals from group four of the periodic system.

It was further found that other amino compounds containing an alcohol group in the molecule function satisfactorily. However, in view of the ready availability the diethylaminoethanoi was preferred.

While 1% has been described in the aforementioned example, other proportions may be employed. The preferred proportion might depend in any specific instance, for example on the amount of thecorrosive dye present in the solution, the character of the metallic part to contact the solution and related factors. If the metal part is a corrosion-resistant part such as stainless steel the quantity and character of the inhibitor need not be as eiiicient as in the instance where the' metal part is, for example,

nickel, tin and the like.

We have found that /2%-2% or 3% usually sumces in most instances. However, it is apparent that smaller amounts may be used but the protection is less, while greater amounts involve added expense and may be regarded as wasteful.

We have found that our addition agents not only render corrosive photographic solutions considerably less active in their attack on common metal parts such as nickel, iron and steel, but their attack on stainless steel of the 18% chromium, 8% nickel or the 24% chromium, 12% nickel type is appreciably decreased, by most'any of the group of agents we have described herein.

Our invention possesses other advantages. Frequently when corrosion takes place the metal surface is severely corroded in local spots, resulting in a badly pitted condition 01' the surface. This may render the surface unfit for use even though the over-all weight loss oi the sample is not great. It was noted in our corrosion tests that the samples, if any corrosion had taken place, showed a very uniform corrosion. Although the corrosion was small in practically all cases, there was definitely no tendency for local by dissimilar allwl groups, groups containing a larger number of carbon atoms, or otherwise modified. Also, it is possible to employ primary or secondary amino alcohols either singly or in various mixtures. Generically we refer to our materials as anti corrosion agents. As indicated above, photographic solutions containing other dyes such as aniline blue,

Zapon colors (manufactured by General Dyestufl Corporation, New York city) etc., as well as other ingredients-such as aliphatic alcohols, halogenated hydrocarbons, cellulosic esters, resins, etc., may be treated in a comparable manner to improve them.

It is, therefore, apparent that our invention is susceptible of some modification.

What we claim and desire to be secured by 2. An improved solution for photographic uses 1 exhibiting a minimum of corrosiveness,any corrosiveness being relatively uniform and without substantial pitting, containing as essential ingredientsa nigrosine dye and a small content of diethylaminoethanol between about .5%-3%.

3. A solution for application to a photographic film base, the solution comprising a metal-corrosive, spirit-soluble dye, an organic solvent for the dye, and an amino alcohol selected from the group consisting of dialkyl amino alcohols and di-(hydroxy alkyl amino) alcohols, said amino alcohol being present in an amount sufficient to retard corrosion of a metal when the solution is in contact with a metal. a

4. A solution for application to a photographic film base, the solution comprising a metal-corrosive, spirit-soluble dye, an alcoholic organic solvent for the dye, and an amino alcohol selected from the group consisting of dialkyl amino alco; hols and 'di-(hydroxy alkyl amino) alcohol, said amino alcohol being present in an amount sufficient to retard corrosion of a metal when the solution is in contact with a metal.

5. A solution for application to a photographic mm base, the solution comprising a metal-corrosive, spirit-soluble nigrosine dye, an organic solvent for the dye, and an amino alcohol selected from the group consisting of dialkyl amino alcohols and di-(hydroxy alkyl amino) alcohols, said amino alcohol being present in an amount suilicient to retard corrosion of a metal when the solution is in contact with a metal.

6. A solution for application to a photographic film base, the solution comprising a. metal-corrosive, spirit-soluble nigrosine dye, an alcoholic organic solvent for the dye, and an amino alcohol selected from the group consisting'of dialkyl amino alcohols and di-(hydroxy alkyl amino) alcohols, said amino alcohol being present in an amount sumcient to retard corrosion of a metal when the solution is in contact with a metal.

7 A solution for application to a photographic film base, the solution comprising a metal-corrosive, spirit-soluble aniline blue dye, an organic solvent for the dye, and an amino alcohol selected from the group consisting of dialkyl amino alcohols and di-(hydroxy alkyl amino) alcohols, said amino alcohol being present in an amount suflicient to retard corrosion 01 a metal when the solution is in contact with a metal.

8. A solution for application to a photographic film base, the solution comprising a metal-corrosive, spirit-soluble aniline blue dye, an alcoholic organic solvent ,for the dye, and an amino alcohol selected from the group consisting of dialkyl amino alcohols and di-(hydroxy alkyl amino) alcohols, said amino alcohol'being present in an amount sufiicient to retard corrosion of a'metal when the solution is in contact with a metal.

9. A solution for application to a photographic film base, the solution comprising a metal-corrosive, spirit-soluble dye, an organic solvent for the dye,'and a dialkyl amino alcohol, said dialkyl amino alcohol being present in an amount sufficient to retard corrosion of a metal when the solution is in contact with a metal.

10. A solution for application to a photographic film base, the solution comprising a metal-corrosive, spirit-soluble dye, an alcoholic organic solvent for the dye, and a dialkyl amino alcohol,

amount sufiicient to retard corrosion of a metal when the solution is in contact with a metal.

11. A solution for application to a. photographic film base, the solution comprising a metal-corfilm base, the solutioncomprising a metal-corrosive, spirit-soluble nigrosinedye, an alcoholic organic solvent for the dye, and a dialkyl amino alcohol, said dialkyl amino alcohol being present in an amount sufllcientto retard corrosion of a metal when the solution is in contact a metal.

13. A solution for application to a photographic film base, the solution comprising a metal-corrosive, spirit-soluble aniline blue dye, an organic solvent for the dye, and a dialkyl amino alcohol,

1 said dialkyl amino alcohol being present in an amount sufficient to retard corrosion of a metal when the solution is in contact with a metal.

14. A solution for application to a photographic film base, the solution comprising ,a metal-corerosive, spirit-soluble aniline blue'dye,-;an alcoholic organic solvent for the dye, and a dialkyl amino alcohol, said dialkyl amino alcohol being present in an amount suflicient to retard cor- ,said'dialkyl amino alcohol being present in an solution is in contact said amino alcohol being presentin an amount sufilcient to retard corrosion of a metal when the solution is in contact with a metal. GALE F. NADEAU. WILLIAM M. TUCKER.

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