Silver halide photographic material

Details Silver halide photographic material Silver halide photographic material

2001-04-10

2003-08-26

Letscher, Geraldine (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

C430S591000, C430S570000, C430S576000, C430S577000

Reexamination Certificate

active

06610468

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a silver halide photographic material, and particularly to a photothermographic material.
BACKGROUND OF THE INVENTION
In the recent medical diagnostic film field and photomechanical film field, it has been eagerly desired to reduce the amount of processing waste fluid, from the viewpoints of environmental preservation and space saving. Accordingly, techniques relating to photothermographic materials have been required as medical diagnostic films and photomechanical films which can be efficiently exposed with a laser image setter or a laser imager and can form sharp black images having high resolution. These photothermographic materials can dispense with the use of processing chemicals of the solution system, so that they can provide to customers heat development processing systems which are simpler and do not damage the environment.
There is also a similar demand in the field of general image formation materials. However, images for medical diagnosis particularly require fine depictions, so that high image quality excellent in sharpness and graininess is necessary. Moreover, they are characterized by that blue black tone images are preferred from the view point of ease of diagnosis. At present, various kinds of hard copy systems utilizing dyes or pigments, such as ink jet printers and electrophotogarphy, are in circulation as general image formation systems. However, they are not satisfactory as output systems of medical images.
On the other hand, heat image formation systems utilizing organic silver salts are described, for example, in U.S. Pat. Nos. 3,152,904 and 3,457,075, and D. Klosterboer,
Thermally Processed Silver Systems
(
Image Processes and Materials
), Neblette, the eighth edition, edited by J. Sturge, V. Walworth and A. Shepp, chapter 9, page 279 (1989). In particular, photothermographic materials generally have light-sensitive layers in which catalytic active amounts of photocatalysts (for example, silver halides), reducing agents, reducible silver salts (for example, organic silver salts) and optionally color toning agents for controlling a color tone of silver are dispersed in binder matrixes. After image exposure, the photothermographic materials are heated to a high temperature (or example, 80° C. or more) to form black silver images by the oxidation-reduction reaction between the reducible silver salts (which act as oxidizing agents) and the reducing agents. The oxidation-reduction reaction is promoted by the catalysis of latent images of silver halides generated by exposure. The black silver images are therefore formed in exposed regions. These are disclosed in many literatures including U.S. Pat. No. 2,910,377 and JP-B-43-4924 (the term “JP-B” as used herein means an “examined Japanese patent publication”).
However, in the organic silver salt-containing photothermographic materials, even the use of sensitizing dyes which can absorb red laser beams has still raised problems with regard to the appearance of fog not practically negligible and changes in performance during storage, although they are alleviated by infrared dyes.
SUMMARY OF THE INVENITON
An object of the present invention is to provide a silver halide photographic material, particularly a photothermographic material, having high sensitivity, low fog and good shelf life (i.e., good storage stability).
The above-described object has been attained by the following means:
(1) A silver halide photographic material comprising at least one kind of merocyanine dye represented by formula (I)
wherein Z
1
represents an atomic group necessary for forming a naphthoxazole ring, R
1
and R
2
each represents an unsubstituted or substituted alkyl group, an aryl group or a heterocyclic group, L
1
, L
2
, L
3
and L
4
each represents a methine group, M
1
represents a charge neutralizing counter ion, and m
1
is a number of 0 or more necessary for neutralizing a charge in a molecule.
(2) The silver halide photographic material described in (1), wherein said merocyanine dye represented by formula (I) is a merocyanine dye represented by formula (II):
wherein R
3
and R
4
each represents an unsubstituted or substituted alkyl group, an aryl group or a heterocyclic group, V
1
, V
2
, V
3
, V
4
, V
5
and V
6
each represents a hydrogen atom or a substituent, L
5
, L
6
, L
7
and L
8
each represents a methine group, M
2
represents a charge neutralizing counter ion, and m
2
is a number of 0 or more necessary for neutralizing a charge in a molecule.
(3) A photothermographic material having a support containing at least one kind of light-sensitive silver halide, a light-insensitive organic silver salt, a reducing agent for a silver ion and a binder in one face thereof, which comprises at least one kind of merocyanine dye represented by formula (I) or (II):
wherein Z
1
represents an atomic group necessary for forming a naphthoxazole ring, R
1
and R
2
each represents an unsubstituted or substituted alkyl group, an aryl group or a heterocyclic group, L
1
, L
2
, L
3
and L
4
each represents a methine group, M
1
represents a charge neutralizing counter ion, and m
1
is a number of 0 or more necessary for neutralizing a charge in a molecule; and
wherein R
3
and R
4
each represents an unsubstituted or substituted alkyl group, an aryl group or a heterocyclic group, V
1
, V
2
, V
3
, V
4
, V
5
and V
6
each represents a hydrogen atom or a substituent, L
5
, L
6
, L
7
and L
8
each represents a methine group, M
2
represents a charge neutralizing counter ion, and m
2
is a number of 0 or more necessary for neutralizing a charge in a molecule.
(4) The silver halide photographic material described in (2), wherein R
4
in the merocyanine dye represented by formula (II) is a carboxymethyl group.
(5) The photothermographic material described in (3), wherein R
4
in the merocyanine dye represented by formula (II) is a carboxymethyl group.
(6) The silver halide photographic material described in (2), wherein V
1
, V
2
, V
3
, V
4
, V
5
and V
6
in the merocyanine dye represented by formula (II) are hydrogen atoms.
(7) The photothermographic material described in (3), wherein V
1
, V
2
, V
3
, V
4
, V
5
and V
6
in the merocyanine dye represented by formula (II) are hydrogen atoms.
(8) A silver halide photographic material comprising at least one kind of merocyanine dye represented by formula (II) and at least one kind of merocyanine dye represented by formula (III):
wherein R
3
and R
4
each represents an unsubstituted or substituted alkyl group, an aryl group or a heterocyclic group, V
1
, V
2
, V
3
, V
4
, V
5
and V
6
each represents a hydrogen atom or a substituent, L
5
, L
6
, L
7
and L
8
each represents a methine group, M
2
represents a charge neutralizing counter ion, and m
2
is a number of 0 or more necessary for neutralizing a charge in a molecule; and
wherein R
5
and R
6
each represents an unsubstituted or substituted alkyl group, an aryl group or a heterocyclic group, V
7
, V
8
, V
9
and V
10
each represents a hydrogen atom or a substituent, L
9
, L
10
, L
11
and L
12
each represents a methine group, M
3
represents a charge neutralizing counter ion, and m
3
is a number of 0 or more necessary for neutralizing a charge in a molecule.
(9) The silver halide photographic material described in (8), wherein V
7
and V
10
in the merocyanine dye represented by formula (III) are each a hydrogen atom, and V
8
and V
9
therein are each an unsubstituted or substituted alkyl group.
(10) The silver halide photographic material described in (2), wherein R
5
in the merocyanine dye represented by formula (II) is an unsubstituted alkyl group having 5 to 10 carbon atoms.
(11) The phot-thermographic material described in (3), wherein R
5
in the merocyanine dye represented by formula (II) is an unsubstituted alkyl group having 5 to 10 carbon atoms.
(12) The silver halide photographic material described in (8), wherein R
5
in the merocyanine dye represented by formula (II) is an unsubstituted alkyl group having 5 to 10 carbon atoms.
(13) The silver ha

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