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Патент USA US2126349

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‘2,126,349
Patented Aug. 9, 1938 ‘
UNITED STATES PATENT OFFICE
2,123,349
PHOTOGRAPHIC DEVELOPING AND FIXING
SOLUTION
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Martti Sale, Rochester, N. W" asslgnor, by memo
assignments, to Eastman Kodak Company, Jer
sey City, N. 1., a corporation of New Jersey
No mrawing. Application .iune 112, 1936,
Serial No. 84.873
10 Claims. (ill. 9)
lllxnnrm: ll
This invention relates to processing solutions
'for ‘photographic layers oi cellulose esters con
Fixing solution
taining silver salts in the body of the layer.
In my prior application, Serial No. 74,815, filed Sodium thlosullate ______________ __grams__ 10
April 16, 1936, I described photographic layers Potassium thlocyanate ____________ _._do____ 5
Water to __________________________ new" so 5
consisting of hydrolyzed cellulose monobasic or
ganic acid esters, such as cellulose acetate, of
The solutions used according to my invention
19 to 33% acyl content containing a sensitive are of value in treating hydrolyzed cellulose ester
silver salt. These layers are treated in the usual
layers of about 26% to about 33% acyl. Where
the cellulose ester has been hydrolyzed to an acyl ll)
10 way to form an image by exposure, development,
‘and ?xing. I have found that while the hydro
content of less than about 26%, the layer is sul
lyzed esters of from 19 to 26% acyl content are
?ciently water-permeable to permit processing
sufficiently water-permeable to enable the de
without the use of swelling agents in the process
ing baths. Where the cellulose ester has been
hydrolyzed to a less degree and the acyl content 15
is above about 33%, the ester is not permeable
to water even in the presence of the swelling
agents referred to and for that reason would not
be satisfactory as a carrier for the sensitive silver
salt. The limits of acyl contents stated are,
however, approximate and not critical limits.
In processing a hydrolyzed cellulose monobasic
velopment and fixing actions to occur in about
15 the same time required with gelatin emulsions,
where an ester containing more than 26% acyl
is used as the carrier for the sensitive silver salt,
the processing solution, such as the developing
and ?xing solutions do not penetrate the cel
2 O lulose ester layer as rapidly as is desired.
It is, therefore, an object of the present in
vention to provide a developing or ?xing solu
tion which permits the dissolved developing or
?xing salts to readily penetrate a hydrolyzed
cellulose ester layer having an acyl content of
acid ester, the photographic layer will contain
about 26 to 33%.
originally a sensitive silver salt, such as silver
halide which after exposure and development
results in the reduction or the exposed silver
in the developing or ?xing solution a swelling
halide to metallic silver, leaving silver halide in
the layer at the points 01’ unexposure. This silver
agent for the hydrolyzed cellulose ester.
Although the rate of penetration of the de
30 veloping and ?xing solutions may be increased
by dilution with an equal or greater volume of
halide is removed in the ?xing solution in a man
ner ‘well understood to those skilled in the art.
My invention may be used in other ways not
2
This object is accomplished by incorporating
water, a more satisfactory method is to dilute the
developer with water and at the same time add
to it a suf?clent quantity of swelling agent to
3 CR decrease the time of penetration of the solution.
Among the swelling agents that I have found
suitable for use in the developer are acetone,
4
45
methyl Cellosolve (methoxy ethanol), ethyl lac
tate and ethyl carbamate. In the ?xing bath
potassium thiocyanate is satisfactory.
The following are speci?c examples of develop
ing and fixing baths compounded according to
my invention, it being understood that they are
for the purposes of illustration only.
EXAMPLE ll
Developing solution
Para -methyl -amlno-phenolsul
50
fate _______________________ __grams__
Sodium sul?te _________________ _-do____
Hydroquinone _________________ __do..___
Sodium carbamate--. __________ __do..___
Potassium bromide _____________ __do-___
Ethyl carbamate _______________ .._do____
Water to _______________________ .4205...
0.31
4.5
1.2
6.7
20
200
herein speci?cally mentioned and it is to be un
derstood that it is limited only by the scope of
the appended claims.
What ll claim is:
,,
l. The method of treating an exposed photo- °
graphic element which comprises immersing the
element including a layer of hydrolyzed cellulose
monobasic organic acid ester of about 26% to
about 33% acyl content containing a silver salt, 40
in a processing solution containing an organic
swelling agent for the cellulose ester.
7
2. The method oi‘ treating air/exposed photo
graphic element which comprises immersing the
element including a layer of hydrolyzed cellu ,a.
lose acetate of about 26% to about 33% acetyl
content containing a silver salt, in a processing
solution containing an organic swelling agent for
the cellulose ester.
3. The method of developing an exposed photo
graphic layer which conprises immersing a layer
of hydrolyzed cellulose monobasic organic acid
ester of about 26% to about 33% acyl content
containing a sensitive silver salt, in a developing
solution containing an organic swelling agent for
the cellulose ester.
2
2, 186,849
4. The method oi developing an exposed photo
graphic layer which comprises immersing a layer
of hydrolyzed cellulose acetate 01 about 28% to
about 83% acetyl content containing a sensitive
silver salt, in a developing solution containing an
organic swelling agent for the cellulose ester.
5. The method oi’ ?xing a photographic image
which comprises immersing a layer 01’ hydrolyzed
cellulose monobasic organic acid ester of about‘
10 26% to about 33% acyl content containing a sil
ver salt and a developed image, in a ?xing solu
tion containing an organic swelling agent for the
cellulose ester.
6. The method of ?xing a photographic image
15 which comprises immersing a layer of hydrolyzed
comprises immersing said layer after exposure
in a developer solution containing ethyl carba
mate.
A
8. The method 0! ‘developing an image in a
photographic layer 0! hydrolyzed cellulose acetate
01' about 26% to about 33% acetyl content con
taining a silver salt, which comprises immersing
said layer after exposure in a developer solution
containing ethyl carbamate.
9. The method of ?xing an image in a photo
10
graphic layer oi' hydrolyzed cellulose monobasic
organic acid ester of about 26% to about 33%
acyl content containing a silver salt and a de
veloped image, which comprises immersing said
layer in a ?xing solution containing potassium 15
cellulose acetate of about 26% to about _ 33%
acetyl content containing a silver salt and a de
thiocyanate.
veloped image, in a ?xing solution containing an
organic swelling agent for the cellulose ester.
'7. The method of developing an image in a
photographic layer of hydrolyzed cellulose mono
basic organic acid ester of about 26% to about
33% acyl content containing a silver salt, which
graphic layer of hydrolyzed cellulose acetate 0!
about 26% to about 33% acetyl content contain
ing a silver salt and a developed image, which 20
10. The method of ?xing an image in a photo
comprises immersing said layer in a ?xing solu
tion containing potassium thlocyanate.
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MAR'I'I'I SALO.
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