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Патент USA US2131742

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Patented Oct. 4, 1938
2,131,742 '
‘I UNITED STATES PATENT OFFICE
2,131,742
PHOTOGRAPHIG nnsnmsmzmc
Karl Kumetat, Dessau-in-Anhalt, and Sebastian
Gassner, Leverkusen, Germany, assignors to
Agfa Ansco Corporation,‘ Binghamton, N. Y., a
corporation of New York
No Drawing. Application October 7, 1936; Serial
No. 104,442. In Germany October 11, 1935
17 Claims.
Our present invention relates to photographic
de'sensitizing.
_
One of its objects is to provide a process of
photographic desensitizing.
Another object is
5 the new desensitizers. Further objects will be
seen from the detailed speci?cation following
hereafter.‘
.
It has been proposed to'use water-soluble de
rivatives of anthraquinone or phenanthrenequi
10 none, particularly anthraquinone-carboxylic acids
and anthraquin'one-sulfonic acids, for desensitiz
.ing light-sensitive, particularly pan-chromatic,
silver halide emulsions. These water-soluble
compounds, however, have not come into use be
15 cause their desensitizing effect is comparatively
small, and is considerably inferior to that of the
known pinacryptol-green. Some of the said
compounds are also open to the objection that
they form precipitates in water containing lime
20 compounds, and others that they are colored.
Both of these properties are undesirable in a de
sensitizer.
\
(Cl. 95-88)
thraquinone-2-sulfo-methyltauride is dissolved in
1 litre of water, together with 25 grams of an
hydrous sodium sul?te. In this solution photo
graphic layers are bathed for 2 minutes and may
then be developed in a‘ bright green light.
Ezcample 3.--Ortho-chromatic and panchro
matic photographic layers are developed in one
litre of a developer of the following composition:
Water __________________________ __litre__
1
Metal (mono-methyl-p-aminophenol)
10
grams"
8
Anhydrous sodium sulflte ________ __do____ 125
Anhydrous sodium carbonate_____ __do____
5.8
Potassium bromide ______________ __do_'___
Sodium
salt
2.5
of anthraquinone-Z-sulfo
methyltauride _______________ __gram__‘
0.5
The development may be first for 1 minute in
the dark and then continued in a bright green
or yellow light.
’
20
The simplest compounds of the class of sub
stances to which the invention relates may be
'
This invention is based on the observation that
the taurides of anthraquinone-carboxylic acids
23 and sulfonic acids have a pronounced desensitiz
ing capacity and are free from the foregoing ob
represented by the following formulae: _
1. Anthraquinone-Z-sulfotauride
25
O
l
jections. Their desensitizing effect exceeds con
siderably that of the vhitherto known best de
sensitizers,
namely
pinacryptol-green.
The
30 'taurides do not form sparingly soluble lime salts
and are colorless. Owing to thecombination of
these favorable properties, the taurides may be
regarded as ideal descnsitizers.‘ They' may be
used either in a preliminary bath or as an addi
30
2. Anthraquinone-2-carbonyl tauride
o
25 tion to the developer. Where a preliminary bath
is used its desensitizing ‘effect may be consider
35
' oo-mn-om-bm-som
ably enhanced by addition of sodium-sulfite.
correspondingly, when used in the developer
their eifect is the stronger the more sodium
40 sul?te the developer contains.
Suitable com
pounds are for instance anthraquinone-l-sulfo
methyl-tauride, anthraquinone - 2 - sulfomethyl
tauride, anthraquinone~sulfotauride, anthraqui
none-2-chloro-3-sulfomethy1tauride, anthraqui
What we claim is:
1. A process for desensitizing light sensitive
silver’halide emulsions which comprises treating
said silver halide emulsion with a tauride of a
45 none-2.6-disulfomethyltauride, anthraquinone-2-~ compound selected from the group consisting of
carbonylmethyltauride and
anthraquinone e 2 -
chloro-3-carbonylmethyltauride.
The following examples illustrate the invention:
Example 1.--1 gram of the sodium-salt of an
50 thraquinone-l-sulfo-methyltauride is dissolved
in 1 litre of water and in this solution ortho
chromatic or panchromatic photographic layers
are bathed for 2 minutes. Development may then
follow, for example in a bright green light.
55
Ercample'2.-—-1 gram of the sodium salt of an
40
anthraquinone' carboxylic acids and. anthraqui—
45
none sulfonlc acids in aqueous solution.
2. A process for desensitizing light sensitive
silver halide emulsions which comprises treating
said silver halide emulsion with a tauride of a 50
compound selected from the group consisting of
anthraquinone carboxylic acids and anthraqui
none sulfonic acids and with an alkali sul?te in
aqueous solution.
3. A process for desensitizing light sensitive sil
55
2,131,742
2
ver halide emulsions which comprises immersing
said silver halide emulsion before development in
an aqueous preliminary bath containing a tau
ride of a compound selected from the group con
sisting of anthraquinone carboxylic acids and
anthraquinone sulfonic acids.
4. A process for desensitizing light sensitive
~ silver halide emulsions which comprises immers
ing said silver halide emulsion before develop
10 ment in an aqueous preliminary bath containing
a tauride of a compound selected from the group
consisting of anthraquinone carboxylic acids and
anthraquinone sulionic acids and an alkali sul
flte.
5. A process for desensitizing light sensitive
15
silver halide emulsions which comprises develop
ing said silver halide emulsions in an aqueous
solution of a developing agent and a tauride of a
compound selected from the group consisting of
20 anthraquinone carboxylic acids and anthraqui
none sulionic acids.
6. A process for desensitizing light sensitive
silver halide emulsions which comprises develop
ing said silver halide emulsions in an aqueous
25 solution of a developing agent and a tauride of a
compound selected from the group consisting of
anthraquinone carboxyiic acids and anthraqui
none sulfonic acids and an alkali sul?te.
so
7. A process for desensitizing light sensitive
silvemhalide emulsions which comprises immers
ing said silver halide emulsions in a bath being
composed of 1000 cc. water and 1 gram of the
sodium salt of the anthraquinone-l-sulfomethyl
tauride.
86
,
v
8. A process for desensitizing light sensitive
silver halide emulsions which comprises immers
ing said silver halide emulsions in a bath being
composed of 1000 cc. water, 25 grams of an
hydrous sodium sul?te and 1 gram of the sodium
salt of the anthraquinone-2-su1fomethyltauride.
9. A process for desensitizing light sensitive
silver halide emulsions which comprises develop
ing said silver halide emulsions in a developer
being composed of 1000 cc. of water, 8 grams of
mono-methyl-p-aminophenol, 125 grams of an
hydrous sodium sul?te, 5.8 grams of anhydrous
sodium-carbonate, 2.5 grams of potassium bro
mide and 0.5 gram of the sodium salt of the
anthraquinone-2-sulfomethyltauride.
10. As a desensitizer for light sensitive silver
halide emulsions a tauride of a compound select
ed from the group consisting oi’ anthraquinone
carboxylic acids and anthraquinone sulfonic acids
in aqueous solution.
11. A bath for desensitizing light sensitive silver
halide emulsions containing a tauride of a com
pound selected from the group consisting of an
thraquinone carboxylic acids and anthraquinone
10
sulfonic acids in aqueous solution.
12. A bath for desensitizing light sensitive
silver halide emulsions containing a tauride of a
compound selected from the group consisting of
anthraquinone carboxylic acids and anthraqui
none sulfonic acids ‘and an alkali sul?te in 15
aqueous solution.
13. A developer for developing light sensitive
silver halide emulsion layers comprising an
aqueous solution of a developing agent for silver
halide emulsions and a tauride of a compound 20
selected from the group consisting of anthraqui
none carboxylic acids and anthraquinone sul
fonic acids.
14. A developer for developing light sensitive
silver halide emulsion layers comprising an 25
aqueous solution of a developing agent for silver
halide emulsions and a tauride of a compound
selected from the group consisting of anthraqui- none carboxylic acids and anthraquinone sul
30
fonic acids and an alkali sul?te.
15. A bath for desensitizing silver halide emul
sions being composed of 1000 cc. of water and 1
gram of the sodium salt of the anthraquinone-l
sulfomethyltauride.
16. A bath for desensitlzing silver halide emul 85
sions being composed of 1000 cc. of water, 25
grams of anhydrous sodium sul?te and 1 gram of
the sodium salt of the anthraquinone-2-sulfome- .
thyitauride.
.
17. A developer for developing silver halide
emulsions being composed of 1000 cc. water, 8
grams of mono-methyl-p-aminophenol, 125 grams
of anhydrous sodiumsulfite, 5.8 grams of anhy
drous sodium-carbonate, 2.5 grams of potassium
bromide and 0.5 gram of the sodium-salt of the ll
anthraquinoneg2-sulfomethyltauride.
KARL KUMETAT.
SEBASTIAN GASSNERi
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