 |
Claims  |
|
|
What is claimed is:
1. In a photographic element to be processed with an electron transfer
agent comprising a support having thereon at least one photosensitive
silver halide emulsion layer having associated therewith a dye
image-providing material comprising a ballasted, redox-dye-releasing
compound, the improvement wherein said element also contains a scavenger
compound having the following formula:
##STR29##
wherein each R represents a substituted or unsubstituted alkyl or aryl
group, with the proviso that at least one R is of such molecular size and
configuration as to render said compound nondiffusible in said
photographic element during development in an alkaline processing
composition, said scavenger compound being capable of being oxidized by
reacting with oxidized electron transfer agent to regenerate said electron
transfer agent, said scavenger compound being separate and distinct from
said dye image-providing material.
2. The photographic element of claim 1 wherein said scavenger compound is
located in said silver halide emulsion layer.
3. The photographic element of claim 1 wherein said scavenger compound is
located in a layer with said dye image-providing material.
4. The photographic element of claim 1 wherein said dye-releasing compound
is a p-sulfonamidonaphthol.
5. The photographic element of claim 1 wherein said element comprises at
least two photosensitive silver halide emulsion layers, said scavenger
compound being located in an interlayer between said emulsion layers.
6. The photographic element of claim 1 wherein each R is phenyl, C.sub.6
H.sub.4 OC.sub.16 H.sub.33 or C.sub.6 H.sub.4 OC.sub.12 H.sub.25.
7. The photographic element of claim 6 wherein said scavenger compound is:
##STR30##
8. The photographic element of claim 6 wherein said scavenger compound is:
##STR31##
9. The photographic element of claim 6 wherein said scavenger compound is:
##STR32##
10. The photographic element of claim 6 wherein said scavenger compound is:
##STR33##
11. In a photographic element to be processed with an electron transfer
agent comprising a support having thereon a red-sensitive silver halide
emulsion layer having associated therewith a cyan dye image-providing
material comprising a ballasted, redox, cyan dye-releasing compound, an
interlayer, a green-sensitive silver halide emulsion layer having
associated therewith a magenta dye image-providing material comprising a
ballasted, redox, magenta dye-releasing compound, an interlayer, and a
blue-sensitive silver halide emulsion layer having associated therewith a
yellow dye image-providing material comprising a ballasted, redox, yellow
dye-releasing compound, the improvement wherein each said interlayer
comprises a scavenger compound having the following formula:
##STR34##
wherein each R represents a substituted or unsubstituted alkyl or aryl
group, with the proviso that at least one R is of such molecular size and
configuration as to render said compound nondiffusible in said
photographic element during development in an alkaline processing
composition, said scavenger compound being capable of being oxidized by
reacting with oxidized electron transfer agent to regenerate said electron
transfer agent, and said scavenger compound being separate and distinct
from said dye image-providing materials.
12. The photographic element of claim 11 wherein said dye-releasing
compound is a p-sulfonamidonaphthol.
13. The photographic element of claim 11 wherein each R is phenyl, C.sub.6
H.sub.4 OC.sub.16 H.sub.33 or C.sub.6 H.sub.4 OC.sub.12 H.sub.25.
14. In a photographic assemblage to be processed with an electron transfer
agent, said assemblage comprising:
(a) a photographic element comprising a support having thereon at least one
photosensitive silver halide emulsion layer having associated therewith a
dye image-providing material comprising a ballasted, redox-dye-releasing
compound; and
(b) a dye image-receiving layer;
the improvement wherein said photographic element also contains a scavenger
compound having the following formula:
##STR35##
wherein each R represents a substituted or unsubstituted alkyl or aryl
group, with the proviso that at least one R is of such molecular size and
configuration as to render said compound nondiffusible in said
photographic element during development in an alkaline processing
composition, said scavenger compound being capable of being oxidized by
reacting with oxidized electron transfer agent to regenerate said electron
transfer agent, said scavenger compound being separate and distinct from
said dye image-providing material.
15. In a photographic assemblage comprising:
(a) a photographic element comprising a support having thereon at least one
photosensitive silver halide emulsion layer having associated therewith a
dye image-providing material comprising a ballasted, redox-dye-releasing
compound;
(b) a dye image-receiving layer; and
(c) an alkaline processing composition and means containing same for
discharge within said assemblage;
said assemblage containing an electron transfer agent; the improvement
wherein said photographic element also contains a scavenger compound
having the following formula:
##STR36##
wherein each R represents a substituted or unsubstituted alkyl or aryl
group, with the proviso that at least one R is of such molecular size and
configuration as to render said compound nondiffusible in said
photographic element during development in an alkaline processing
composition, said scavenger compound being capable of being oxidized by
reacting with oxidized electron transfer agent to regenerate said electron
transfer agent, said scavenger compound being separate and distinct from
said dye image-providing material.
16. The photographic assemblage of claim 15 wherein said scavenger compound
is located in said silver halide emulsion layer.
17. The photographic assemblage of claim 15 wherein said scavenger compound
is located in a layer with said dye image-providing material.
18. The photographic assemblage of claim 15 wherein said dye-releasing
compound is a p-sulfonamidonaphthol.
19. The photographic assemblage of claim 15 wherein said element comprises
at least two photosensitive silver halide emulsion layers, said scavenger
compound being located in an interlayer between said emulsion layers.
20. The photographic assemblage of claim 15 wherein each R is phenyl,
C.sub.6 H.sub.4 OC.sub.16 H.sub.33 or C.sub.6 H.sub.4 OC.sub.12 H.sub.25.
21. In a photographic assemblage comprising:
(a) a photographic element comprising a support having thereon a
red-sensitive silver halide emulsion layer having associated therewith a
cyan dye image-providing material comprising a ballasted, redox, cyan
dye-releasing compound, an interlayer, a green-sensitive silver halide
emulsion layer having associated therewith a magenta dye image-providing
material comprising a ballasted, redox, magenta dye-releasing compound, an
interlayer, and a blue-sensitive silver halide emulsion layer having
associated therewith a yellow dye image-providing material comprising a
ballasted, redox, yellow dye-releasing compound;
(b) a dye image-receiving layer; and
(c) an alkaline processing composition and means containing same for
discharge within said assemblage;
said assemblage containing an electron transfer agent; the improvement
wherein each said interlayer comprises a scavenger compound having the
formula:
##STR37##
wherein each R represents a substituted or unsubstituted alkyl or aryl
group, with the proviso that at least one R is of such molecular size and
configuration as to render said compound nondiffusible in said
photographic element during development in an alkaline processing
composition, said scavenger compound being capable of being oxidized by
reacting with oxidized electron transfer agent to regenerate said electron
transfer agent, and said scavenger compound being separate and distinct
from said dye image-providing materials.
22. The photographic assemblage of claim 15 wherein:
(a) said dye image-receiving layer is located between said support and said
silver halide emulsion layer; and
(b) said assemblage also includes a transparent cover sheet over the layer
outermost from said support.
23. The photographic assemblage of claim 22 wherein said cover sheet has
thereon, in sequence, a neutralizing layer and a timing layer.
24. The photographic assemblage of claim 23 wherein said discharging means
is a rupturable container containing said alkaline processing composition
and an opacifying agent, said container being so positioned during
processing of said assemblage that a compressive force applied to said
container will effect a discharge of the container's contents between said
transparent sheet and the layer outermost from said support.
25. The photographic assemblage of claim 15 wherein said support having
thereon said photosensitive silver halide emulsion layer is opaque and
said dye image-receiving layer is located on a separate transparent
support superposed over the layer outermost from said opaque support.
26. The photographic assemblage of claim 25 wherein said transparent
support has thereon, in sequence, a neutralizing layer, a timing layer and
said dye image-receiving layer.
27. In an integral photographic assemblage comprising:
(a) a photosensitive element comprising a transparent support having
thereon the following layers in sequence: a dye image-receiving layer, an
alkaline solution-permeable, light-reflective layer, an alkaline
solution-permeable, opaque layer, a red-sensitive silver halide emulsion
layer having associated therewith a cyan dye image-providing material
comprising a ballasted, redox, cyan dye-releasing compound, an interlayer,
a green-sensitive silver halide emulsion layer having associated therewith
a magenta dye image-providing material comprising a ballasted, redox,
magenta dye-releasing compound, an interlayer, and a blue-sensitive silver
halide emulsion layer having associated therewith a yellow dye
image-providing material comprising a ballasted, redox, yellow
dye-releasing compound;
(b) a transparent sheet superposed over said blue-sensitive silver halide
emulsion layer and comprising a transparent support having thereon, in
sequence, a neutralizing layer and a timing layer; and
(c) a rupturable container containing an alkaline processing composition
and an opacifying agent which is so positioned during processing of said
assemblage that a compressive force applied to said container will effect
a discharge of the container's contents between said transparent sheet and
said blue-sensitive silver halide emulsion layer;
said assemblage containing an electron transfer agent; the improvement
wherein each said interlayer comprises a scavenger compound having the
formula:
##STR38##
wherein each R represents a substituted or unsubstituted alkyl or aryl
group, with the proviso that at least one R is of such molecular size and
configuration as to render said compound nondiffusible in said
photographic element during development in an alkaline processing
composition, said scavenger compound being capable of being oxidized by
reacting with oxidized electron transfer agent to regenerate said electron
transfer agent, and said compound being separate and distinct from said
dye image-providing materials.
28. In a process for producing a photographic image in color in an
imagewise-exposed photographic element comprising a support having thereon
at least one photosensitive silver halide emulsion layer having associated
therewith a dye image-providing material comprising a ballasted,
redox-dye-releasing compound, said process comprising:
treating said element with an alkaline processing composition in the
presence of an electron transfer agent to effect development of each
exposed silver halide emulsion layer, whereby:
(a) an imagewise distribution of said dye is formed as a function of said
development of said silver halide emulsion layer; and
(b) at least a portion of said imagewise distribution of said dye diffuses
out of said element,
the improvement wherein said process is performed in the presence of a
scavenger compound having the following formula:
##STR39##
wherein each R represents a substituted or unsubstituted alkyl or aryl
group, with the proviso that at least one R is of such molecular size and
configuration as to render said compound nondiffusible in said
photographic element during development in an alkaline processing
composition, said scavenger compound being oxidized by reacting with
oxidized electron transfer agent to regenerate said electron transfer
agent, and said scavenger compound being separate and distinct from said
dye image-providing material.
29. The process of claim 28 wherein said image-wise distribution of said
dye diffuses to a dye image-receiving layer.
30. The process of claim 28 wherein said scavenger compound is located in
said silver halide emulsion layer.
31. The process of claim 28 wherein said scavenger compound is located in a
layer with said dye image-providing material.
32. The process of claim 28 wherein said scavenger dye-releasing compound
is a p-sulfonamidonaphthol.
33. The process of claim 28 wherein said element comprises at least two
photosensitive silver halide emulsion layers, said scavenger compound
being located in an interlayer between said emulsion layers.
34. The process of claim 28 wherein each R is phenyl, C.sub.6 H.sub.5
OC.sub.16 H.sub.33 or C.sub.6 H.sub.4 OC.sub.12 H.sub.25.
35. The process of claim 28 wherein said photographic element comprises a
support having thereon a red-sensitive silver halide emulsion layer having
associated therewith a cyan dye image-providing material comprising a
ballasted, redox, cyan dye-releasing compound, an interlayer, a
green-sensitive silver halide emulsion layer having associated therewith a
magenta dye image-providing material comprising a ballasted, redox,
magenta dye-releasing compound, an interlayer, and a blue-sensitive silver
halide emulsion layer having associated therewith a yellow dye
image-providing material comprising a ballasted, redox, yellow
dye-releasing compound, and said scavenger compound is located in each
said interlayer.
36. A process for preventing color contamination in an imagewise-exposed
photographic element comprising a support having thereon at least one
photosensitive silver halide emulsion layer having associated therewith a
dye image-providing material comprising a ballasted, redox-dye-releasing
compound, said process comprising reacting with an oxidized electron
transfer agent, generated as a result of development of said element, a
scavenger compound having the following formula:
##STR40##
wherein each R represents a substituted or unsubstituted alkyl or aryl
group, with the proviso that at least one R is of such molecular size and
configuration as to render said compound nondiffusible during development
in an alkaline processing composition, said scavenger compound being
separate and distinct from said dye image-providing material, whereby said
scavenger compound is oxidized to regenerate said electron transfer agent. |
|
 |
|
 |
Claims |
|
|
|
Description |
|
|
This invention relates to photography, and more particularly to
photographic assemblages for color diffusion transfer photography wherein
certain ballasted di-2,5-sulfonamidophenols are used to scavenge oxidized
electron transfer agents.
U.S. Pat. No. 4,076,529 of Fleckenstein et al, issued Feb. 28, 1978,
describes various color image transfer elements which employ
nondiffusible, redox-dye-releasing compounds which are alkali-cleavable
upon oxidation to release a diffusible color-providing moiety. An electron
transfer agent (ETA) is oxidized as a function of development. The
ETA.sub.ox then cross-oxidizes the dye-releasing compound. Interlayers
containing scavenging compounds, such as 2,5-di-sec-dodecylhydroquinone,
are usually employed in these elements to prevent the ETA which is
oxidized as a function of development of one emulsion layer from migrating
to adjacent imaging layers where it would cause the "wrong" dye to be
released. In the absence of an interlayer scavenger, severe color
contamination would result in the final color image. Most scavenger
compounds function by becoming oxidized by the oxidized ETA to regenerate
the ETA. While certain compounds have been found to be useful for this
purpose, compounds which are more effective and which exhibit little or no
loss in scavenging efficiency upon long-term keeping are desired.
Research Disclosure 15162, November 1976, on page 83, discloses various
scavengers for developer oxidation products in color diffusion transfer
systems. Among the compounds described are "ballasted sulfonamidophenols
and sulfonamidonaphthols without dye moieties attached thereto, e.g.,
4-benzenesulfonamido-1-hydroxy-N-[4-(2,4-di-t-pentylphenoxy)butyl]-2-napht
hamide". Phenols with two sulfonamido groups as described herein are not
mentioned, however.
U.S. Pat. No. 2,336,327 relates to the use of aminophenols in an interlayer
in photographic materials. U.S. Pat. Nos. 3,459,548 and 3,597,474 relate
to the use of zwitterionic salts of p-aminophenols as scavengers for
oxidized developer in certain color transfer systems. U.S. Pat. Nos.
3,482,971 and 3,622,603 describe the use of aminophenol derivatives as
scavengers for oxidized developer in certain color transfer systems. U.S.
Pat. No. 3,582,333 relates to the use of N-substituted p-aminophenol in an
interlayer to reduce color fog formation and loss of speed. U.S. Pat. No.
3,930,862 relates to the use of catechols containing an alkylsulfonamido
group as an auxiliary developer. U.S. Pat. No. 3,734,726 relates to the
use of m-sulfonamidophenol dye releasers. U.S. Pat. No. 3,403,721 relates
to the use of aminophenols in an overcoat layer of a photographic element
to prevent color fog or stain. Research Disclosure 15234, December 1976,
relates to the use of a developer scavenger combination comprising an
aminophenol and a polyhydroxy benzene to improve processing temperature
latitude in color transfer processes. These references, however, neither
teach the use of the specific compounds described herein nor the improved
results obtained therewith.
A photographic element in accordance with our invention comprises a support
having thereon at least one photosensitive silver halide emulsion layer
having associated therewith a dye image-providing material, and wherein
the element contains a compound having the following formula:
##STR1##
wherein each R represents a substituted or unsubstituted alkyl or aryl
group, with the proviso that at least one R is of such molecular size and
configuration as to render the compound nondiffusible in the photographic
element during development in an alkaline processing composition.
In the above formula, each R can independently represent an alkyl group,
including a substituted alkyl group, such as those having from 1 to about
40 carbon atoms, e.g., methyl, ethyl, isopropyl, butyl, pentyl,
hydroxyethyl, decyl, dodecyl, etc; or an aryl group, including a
substituted aryl group, such as those having from 6 to about 40 carbon
atoms, e.g., phenyl, p-methoxyphenyl, p-sulfamoylphenyl,
p-N-dodecylsulfamylphenyl, p-dodecylphenyl, 2,4-di-t-amylphenyl,
2-methoxy-4-octadecylphenyl, 4-phenoxyphenyl, o-dodecyloxy-p-tolyl, etc;
so long as at least one R, or both R's in combination, is a ballast group,
i.e., is of such molecular size and configuration as to render the
compound nondiffusible in the photographic element during development in
an alkaline processing composition.
In a preferred embodiment of the invention, each R can independently
represent a phenyl group or a phenyl group substituted with additional
substituents, such as substituted or unsubstituted alkyl, aryl, acyl,
acylamino, alkoxy, aryloxy, sulfonamido, carbamoyl, sulfamoyl, sulfonyl
and the like. Especially good results have been obtained when R is phenyl,
C.sub.6 H.sub.4 OC.sub.16 H.sub.33 or C.sub.6 H.sub.4 OC.sub.12 H.sub.25.
Typical compounds included within the scope of the above formula include
the following:
##STR2##
where R and R' are as follows:
__________________________________________________________________________
R R'
__________________________________________________________________________
(1) C.sub.6 H.sub.5
##STR3##
(2) C.sub.6 H.sub.5
##STR4##
(3)
##STR5## C.sub.6 H.sub.5
(4)
##STR6##
##STR7##
(5)
##STR8## C.sub.6 H.sub. 5
(6)
##STR9##
##STR10##
(7) C.sub.6 H.sub.5
##STR11##
(8)
##STR12##
##STR13##
(9) C.sub.6 H.sub.5
##STR14##
(10)
##STR15##
##STR16##
(11)
C.sub.16 H.sub.33 C.sub.16 H.sub.33
(12)
C.sub.6 H.sub.5 C.sub.16 H.sub.33
(13)
##STR17##
##STR18##
(14)
C.sub.6 H.sub.5
##STR19##
__________________________________________________________________________
In a preferred embodiment of our invention, the scavenger compound is
located in the photographic element in an interlayer between the various
emulsion layers. Such interlayers typically comprise the compound,
gelatin, a coupler solvent and other usual addenda. The compound can be
employed in any amount which is effective for the intended purpose. Good
results have been obtained when the compound is employed in a coverage of
from about 200 to 2,000 mg/m.sup.2.
The compound, however, can also be located in other positions in the
photographic element, such as in a silver halide emulsion layer or in the
dye image-providing material layer. In these latter two locations, the
compound could scavenge a portion of the oxidized developing agent before
it can react with the dye image-providing material and therefore act as a
competer for oxidized developer. Such competers are useful in diffusion
transfer systems when development takes place at higher than optimum
temperatures. For example, at high temperatures, such as 32.degree. to
35.degree. C., there can be excessive development, which causes more
oxidized developing agent to be generated and more dye to be released.
This will cause a significant loss in speed and an increase in D.sub.max
and D.sub.min. The presence of a competer will help to alleviate the
problem somewhat by scavenging a portion of the oxidized developing agent
to reduce the amount of dye released. The compound, when used as a
competer, can be employed in any amount which is effective for the
intended purpose. Good results have usually been obtained when the
compound is employed in a coverage of from about 5 to 500 mg/m.sup.2.
The dye image-providing material useful in our invention can be positive-
or negative-working, and can be initially mobile or immobile in the
photographic element during processing with an alkaline composition.
Examples of initially mobile, positive-working dye image-providing
materials useful in our invention are described in U.S. Pat. Nos.
2,983,606; 3,536,739; 3,705,184; 3,482,972; 2,756,142; 3,880,658 and
3,854,985. Examples of negative-working dye image-providing materials
useful in our invention include conventional couplers which react with
oxidized aromatic primary amino color developing agents to produce or
release a dye such as those described, for example, in U.S. Pat. No.
3,227,550 and Canadian Pat. No. 602,607. In a preferred embodiment of our
invention, the dye image-providing material is a ballasted,
redox-dye-releasing (RDR) compound. Such compounds are well known to those
skilled in the art and are generally speaking, compounds which will redox
with oxidized developing agent or electron transfer agent to release a
dye, such as by alkaline hydrolysis, or prevent the release of dye, such
as by intramolecular nucleophilic displacement. Such nondiffusible RDR's
can be positive-working compounds, as described in U.S. Pat. No.
3,980,479, British Pat. No. 1,464,104 and U.S. Pat. No. 4,139,379, issued
Feb. 13, 1979. Such nondiffusible RDR's can also be negative-working
compounds, as described in U.S. Pat. Nos. 3,728,113 of Becker et al;
3,725,062 of Anderson and Lum; 3,698,897 of Gompf and Lum; 3,628,952 of
Puschel et al; 3,443,939 and 3,443,940 of Bloom et al; 4,053,312 of
Fleckenstein; 4,076,529 of Fleckenstein et al; 4,055,428 of Koyama et al;
German Pat. Nos. 2,505,248 and 2,729,820; Research Disclosure 15157,
November, 1976; and Research Disclosure 15654, April, 1977. In a more
preferred embodiment of our invention, the nondiffusible RDR's are
ballasted p-sulfonamidonaphthol compounds, each of which has a
color-providing moiety attached thereto through a sulfonamido group which
is alkali-cleavable upon oxidation.
A process for producing a photographic image in color according to our
invention comprises:
treating an imagewise-exposed photographic element, as described above,
with an alkaline processing composition in the presence of a silver halide
developing agent to effect development of each exposed silver halide
emulsion layer, whereby:
(a) an imagewise distribution of dye is formed as a function of the
development of the silver halide emulsion layer; and
(b) at least a portion of the imagewise distribution of the dye diffuses
out of the element, such as to a dye image-receiving layer.
A process for producing a photographic image in color according to our
invention using a preferred element as described above wherein the
nondiffusible RDR is a ballasted compound having a color-providing moiety
attached thereto through a sulfonamido group which is alkali-cleavable
upon oxidation comprises:
treating said element which has been imagewise-exposed with an alkaline
processing composition in the presence of a silver halide developing agent
to effect development of each exposed silver halide emulsion layer,
whereby:
(a) the developing agent becomes oxidized;
(b) the oxidized developing agent cross-oxidizes the sulfonamido compound;
(c) the oxidized sulfonamido compound then cleaves, thus forming an
imagewise distribution of the color-providing moiety as a function of the
development of the silver halide emulsion layer; and
(d) at least a portion of the imagewise distribution of the color-providing
moiety diffuses out of the element, such as to a dye image-receiving
layer.
It will be appreciated that, after processing the photographic elements
described above, there remains in the elements, after transfer has taken
place, an imagewise distribution of dye in addition to developed silver. A
color image comprising residual nondiffusible compound may be obtained in
these elements if the residual silver and silver halide are removed in any
conventional manner well known to those skilled in the photographic art,
such as a bleach bath followed by a fix bath, a bleach-fix bath, etc. The
imagewise distribution of dye may also diffuse out of these elements into
these baths, if desired, rather than to an image-receiving element.
The photographic element in the above-described processes can be treated
with an alkaline processing composition to effect or initiate development
in any manner. A preferred method for applying processing composition is
by use of a rupturable container or pod which contains the composition. In
general, the processing composition employed in this invention contains
the developing agent for development, although the composition could also
be solely an alkaline solution where the developer is incorporated in the
photographic element, the image-receiving element or the process sheet, in
which case the alkaline solution serves to activate the incorporated
developer.
A photographic film unit or assemblage in accordance with this invention is
adapted to be processed by an alkaline processing composition, and
comprises:
(1) a photographic element as described above; and
(2) a dye image-receiving layer.
In this embodiment, the processing composition may be inserted into the
film unit, such as by interjecting processing solution with communicating
members similar to hypodermic syringes which are attached either to a
camera or camera cartridge. The processing composition may also be applied
by means of a swab or by dipping in a bath, if so desired.
In a preferred embodiment of the invention, the assemblage itself contains
the alkaline processing composition and means containing same for
discharge within the film unit, such as a rupturable container which is
adapted to be positioned during processing of the film unit so that a
compressive force applied to the container by pressure-applying members,
such as would be found in a camera designed for in-camera processing, will
effect a discharge of the container's contents within the film unit.
The dye image-receiving layer in the above-described film unit can be
located on a separate support adapted to be superposed on the photographic
element after exposure thereof. Such image-receiving elements are
generally disclosed, for example, in U.S. Pat. No. 3,362,819. When the
means for discharging the processing composition is a rupturable
container, it is usually positioned in relation to the photographic
element and the image-receiving element so that a compressive force
applied to the container by pressure-applying members, such as would be
found in a typical camera used for in-camera processing, will effect a
discharge of the container's contents between the image-receiving element
and the outermost layer of the photographic element. After processing, the
dye image-receiving element is separated from the photographic element.
The dye image-receiving layer in the above-described film unit can also be
located integral with the photographic element between the support and the
lowermost photosensitive silver halide emulsion layer. One useful format
for integral receiver-negative photographic elements is disclosed in
Belgian Pat. No. 757,960. In such an embodiment, the support for the
photographic element is transparent and is coated with an image-receiving
layer, a substantially opaque light-reflective layer, e.g., TiO.sub.2, and
then the photosensitive layer or layers described above. After exposure of
the photographic element, a rupturable container containing an alkaline
processing composition and an opaque process sheet are brought into
superposed position. Pressure-applying members in the camera rupture the
container and spread processing composition over the photographic element
as the film unit is withdrawn from the camera. The processing composition
develops each exposed silver halide emulsion layer, and dye images, formed
as a function of development, diffuse to the image-receiving layer to
provide a positive, right-reading image which is viewed through the
transparent support on the opaque reflecting layer background. For other
details concerning the format of this particular integral film unit,
reference is made to the above-mentioned Belgian Pat. No. 757,960.
Another format for integral negative-receiver photographic elements in
which the present invention can be employed is disclosed in Belgian Pat.
No. 757,959. In this embodiment, the support for the photographic element
is transparent and is coated with the image-receiving layer, a
substantially opaque, light-reflective layer and the photosensitive layer
or layers described above. A rupturable container, containing an alkaline
processing composition and an opacifier, is positioned between the top
layer and a transparent cover sheet which has thereon a neutralizing layer
and a timing layer. The film unit is placed in a camera, exposed through
the transparent cover sheet and then passed through a pair of
pressure-applying members in the camera as it is being removed therefrom.
The pressure-applying members rupture the container and spread processing
composition and opacifier over the negative portion of the film unit to
render it light-insensitive. The processing composition develops each
silver halide layer and dye images, formed as a result of development,
diffuse to the image-receiving layer to provide a positive, right-reading
image which is viewed through the transparent support on the opaque
reflecting layer background. For further details concerning the format of
this particular integral film unit, reference is made to the
above-mentioned Belgian Pat. No. 757,959.
Still other useful integral formats in which this invention can be employed
are described in U.S. Pat. Nos. 3,415,644; 3,415,645; 3,415,646;
3,647,437; and3,635,707. In most of these formats, a photosensitive silver
halide emulsion is coated on an opaque support, and a dye image-receiving
layer is located on a separate transparent support superposed over the
layer outermost from the opaque support. In addition, this transparent
support also preferably contains a neutralizing layer and a timing layer
underneath the dye image-receiving layer.
Another embodiment of the invention uses the image-reversing technique
disclosed in British Pat. No. 904,364, page 19, lines 1 through 41. In
this process, the dye-releasing compounds are used in combination with
physical development nuclei in a nuclei layer contiguous to the
photosensitive silver halide negative emulsion layer. The film unit
contains a silver halide solvent, preferably in a rupturable container
with the alkaline processing composition.
The film unit or assembly of the present invention may be used to produce
positive images in single-or multicolors. In a three-color system, each
silver halide emulsion layer of the film assembly will have associated
therewith a dye image-providing material which possesses a predominant
spectral absorption within the region of the visible | | |
