Radiation imagery chemistry: process – composition – or product th – Transfer procedure between image and image layer – image... – Diffusion transfer process – element – or identified image...
Reexamination Certificate
2000-05-24
2001-07-31
Schilling, Richard L. (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Transfer procedure between image and image layer, image...
Diffusion transfer process, element, or identified image...
C430S213000, C430S216000, C430S941000
Reexamination Certificate
active
06268105
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an improvement in fastness to light of a dye-fixing element in an image-forming system using a photosensitive element and the dye-fixing element. More particularly, the present invention relates to a method for forming an image which is improved in fastness to light in a method for forming an image wherein an image-forming dye is produced and released by exposure and development of a photosensitive silver halide and the image-forming dye is diffused or transferred from a photosensitive layer to an image-receiving layer thereby forming the image. The present invention relates also to an image-receiving element utilizable for an image-forming method wherein an image-forming dye is formed or released by exposure and development of a photosensitive silver halide and the image-forming dye is diffused or diffusion-transferred from a photosensitive layer to an image-receiving layer thereby forming the image.
BACKGROUND OF THE INVENTION
It is known that a photographic material for a color-diffusive transfer method (the so-called instant photography), a heat-development color-diffusive transfer method and a method employing a photosensitive microcapsule are known as a method for forming an image wherein a photosensitive silver halide is exposed and developed to form or release and diffuse an image-forming dye followed by transfer of the dye to form an image.
Images obtained according to these methods are generally poor in fastness to light as compared with those obtained according to conventional photographic methods so that a variety of methods have been proposed hitherto for enhancing fastness to light.
Mentioned as one of the methods is the use of a UV-absorbing agent. This method comprises decreasing the light quantity irradiated to a color image by the UV-absorbing agent to enhance fastness to light. As a matter of course, however, this method inhibited fading due to ultraviolet light but utterly failed to inhibit fading due to visible light. In addition, a problem arises in fading or discoloring of an image caused by the UV-absorbing agent.
It is secondarily or incidentally necessary to use a relatively large amount of a UV-absorbing agent to sufficiently improve the fastness to light. The use of a large amount of UV-absorbing agent results in an increase of film thickness so that it causes a problem such as increase in transfer time, deterioration of resolution and poor turn of processing as well as a problem such as deterioration of film strength and precipitation of the UV-absorbing agent.
What is more, the effect of a fluorescent brightening agent is lowered to decrease whiteness and the like principle problem, thus failing to impart sufficient fastness to light to an image.
A discussion is also made on various fade-preventing agents employed in the so-called conventional photographic system. However, the fade-preventing agents useful in the conventional photographic system are oil-soluble. On the other hand, dyes used in the photographic method of the present invention wherein the dyes are transferred to form images are chiefly water-soluble. Accordingly, a satisfactory effect could not be achieved in the present invention wherein the fade-preventing agents were absent in a position where they could sufficiently react with the dyes on account of the layer construction.
In the dye-diffusive transfer system, effective fade-preventing agent are disclosed in JP-A-62-1441 (“JP-A” means unexamined published Japanese patent application). The invention in the publication discloses dye image receiving materials containing piperidines in color diffusion-transfer photography, but fails to disclose radicals and could not achieve sufficient effects.
As another invention, JP-B-49-20974 (“JP-B” means examined Japanese patent publication) discloses addition of hindered piperidines and/or radicals thereof to a photosensitive material and also discloses that the effect is also attained in the dye-diffusive transfer method. In case these additives are added directly to a dye-fixing element, however, color mixing will be generated and photographic characteristic change will also take place, thus failing to obtain a good color image.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method for forming a color image excellent in fastness to light without causing any color-mixing in methods of forming an image wherein an image-forming dye or a precursor thereof is released or produced by exposure and development of a photosensitive silver halide and the dye is diffused or transferred to form the image.
It is another object of the present invention to provide an image-forming material capable of forming an image excellent in fastness to light without causing color-mixing in the method of forming an image.
It is still another object of the present invention to provide a dye-fixing element utilizable for the method for forming an image.
It is still further object of the present invention to provide a dye-fixing element comprising a specific polymeric dye mordant.
Other and further objects, features, and advantages of the invention will appear more fully from the following description.
DETAILED DESCRIPTION OF THE INVENTION
As a result of extensive research for solving the above problem, it has now been found that an image can significantly be improved in fastness to light and moreover color-mixing can also be prevented by the use of even a small amount of a polymeric dye mordant wherein a radical of a piperidine derivative may not be diffused on development in a photosensitive element while maintaining water-solubility of the radical of the piperidine derivative. The present invention has been accomplished on the basis of the above finding.
Thus, the objects of the present invention have been attained by the following dye-fixing element and the method for forming an image.
(1) A dye-fixing element utilizable for formation of an image by releasing or producing an image-forming dye or a precursor thereof in proportion or contraproportion to developed silver formed by development after imagewise exposing of a photosensitive silver halide and thereafter by diffusion or diffusive-transfer of the dye, which element comprises a polymeric dye mordant containing a recurring unit represented by the following formula (A) and/or a recurring unit represented by the following formula (B):
wherein R
12
and R
22
each stand for a hydrogen atom or an alkyl group, Y
1
and Y
2
each stand for ←CONR
4
—, ←COO— or ←CH(OH)CH
2
O—, X stands for a chlorine atom, a bromine atom, an iodine atom or a hydroxyl group, Z stands for an atomic group necessary for forming a 5- to 7-membered hetero ring together with the nitrogen atom, R
13
and R
23
each stand for a hydrogen atom, a methyl group, an ethyl group, or a halogen atom, and R
4
stands for a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and wherein the symbol ← stands for a bond on the side of the main chain of the polymer.
(2) The dye-fixing element according to the paragraph (1), wherein a photosensitive material and/or the dye-fixing element is incorporated with a base or a precursor thereof and the material and the element are overlapped each other with a small amount of water and heated after imagewise exposing thereby effecting development.
(3) The dye-fixing element according to the paragraph (1) or (2), wherein the dye-mordant contains a recurring unit represented by the formula (A) and/or a recurring unit represented by the formula (B) in an amount of at least 0.5 mol % based on the total recurring unit being 100 mol %.
(4) The dye-fixing element according to the paragraph (1), (2) or (3), wherein the dye-mordant is represented by the following formula (C):
wherein Y
1
, Y
2
, R
12
, R
22
and X have the same meanings as given in the formulas (A) and (B), M stands for an alkali metal ion, a is 50-99 mol %, a total of b and e is 1-10 mol %, c is 0-49 mol %, and d is 0-10 mol %, with the proviso that a, b, c, d and e are so selected that the to
Arakatsu Hiroshi
Seto Nobuo
Taguchi Toshiki
Fuji Photo Film Co. , Ltd.
Schilling Richard L.
LandOfFree
Dye-fixing element and image-forming method, using a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dye-fixing element and image-forming method, using a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dye-fixing element and image-forming method, using a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2553313