Thermally developable photosensitive material

Details Thermally developable photosensitive material Thermally developable photosensitive material

1999-04-05

2001-04-10

Chea, Thorl (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

C430S607000, C430S613000, C430S614000

Reexamination Certificate

active

06214533

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a thermally developable photosensitive material, and specifically to a thermally developable photosensitive material in which without accompanying degradation of image lasting quality, fog is minimized, and a decrease in sensitivity as well as pre-exposure storage stability are also improved.
Thermally developable photosensitive materials, which form photographic images employing a thermally developable processing method, are disclosed, for example, in U.S. Pat. Nos. 3,152,904 and 3,457,075, and D. Morgan and B. Shely, “Thermally Processed Silver Systems” (Imaging Processes and Materials, Neblette 8th edition, edited by Sturge, V. Walworth, A. Shepp, page 2, 1969). Such thermally developable materials comprise a reducible silver source (for, example, organic silver salts), light catalysts (for example, silver halides) in a catalytically active amount, and reducing agents which are generally dispersed in a (an organic) binder matrix. The thermally developable photosensitive materials are stable at normal temperature, and after exposure, when they are heated to high temperatures (for example, at least 80° C.), silver is formed through an oxidation-reduction reaction of the reducible silver source (working as an oxidizing agent) with a reducing agent. This oxidation-reduction reaction is accelerated with a catalytic action of a latent image formed by exposure. Silver formed by the reaction of an organic silver salt in an exposed area provides a black image. This is in contrast to the unexposed area, and thereby forms an image. Antifoggants to minimize fog in the formed image are employed, if desired. The most effective method as the conventional fog retardation technique was a method in which mercury compounds were employed as antifoggants. Incorporation of mercury compounds as antifoggants in photosensitive materials is disclosed, for example, in U.S. Pat. No. 3,589,903. However, mercury compounds are not environmentally desired and development of mercury-free antifoggants has been demanded. As mercury-free antifoggants, heretofore, various types of polyhalides have been disclosed (for example, refer to U.S. Pat. Nos. 3,874,946, 4,756,999, and 5,340,712; European Patent Nos. 605,981A1, 622,666A1, and 631,176A1; Japanese Patent Publication No. 54-165; and Japanese Patent Publication Open to Public Inspection No. 7-2781). However, these described compounds caused problems in which fog preventing capability was low or silver tone was degraded. Furthermore, those having excellent fog inhibiting capability caused a problem with a decrease in sensitivity. Thus improvements have been sought. Furthermore, there has been a problem in which when photosensitive materials piled up in the layer structure are stored under forcibly heated and humidified conditions, and then, were subjected to exposure and development, fog in the unexposed area increased. Thus the development of antifoggants has been desired which do not cause these problems. As methods to overcome these problems, polyhalides which bring about improvement in the above-mentioned problems are described in each of issues of Japanese Patent Publication Open to Public Inspection Nos. 9-160164, 9-244178, 9-258367, 9-265150, 9-281640, and 9-319022. However, when these compounds are applied specifically to a thermally developable photosensitive material for a medical laser imager or a thermally developable photosensitive material, comprising a contrast increasing agent, for output of a printing image setter having oscillating wavelengths of 600 to 800 nm, the above-mentioned problems are overcome fairly well. However, on the other hand, a problem has been caused in which the image stability, with the passage of time, is not sufficient enough in such a manner that the fog of the processed sample increases as time passes.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a thermally developable photosensitive material which does not result in an increase in fog with the passage of time, and to provide a thermally developable photosensitive material for a laser imager, which exhibits high sensitivity, minimum fog, and excellent storage stability of a pre-exposure photosensitive material, and a thermally developable photosensitive material for the output film of an image setter, which exhibits high contrast forming properties, high sensitivity, minimum fog, and excellent storage stability of pre-exposure photosensitive material.
MEANS FOR SOLVING THE PROBLEM BY THE PRESENT INVENTION
The object is accomplished by the following invention.
A thermally developable photosensitive material has a support and at least one emulsion layer comprising a binder and photosensitive silver halide provided on the support, wherein the thermally developable photosensitive material comprises at least one of dye represented by Formula I-a through I-d and at least one of compound represented by Formula 2.
In the formula, each of Z
11
, Z
12
, Z
21
, Z
22
, Z
31
, Z
41
and Z
42
represents non-metallic atom group necessary to form 5 member or 6 member nitrogen-containing heterocycle of monocyclic ring or condensed ring. Each of Q
31
, Q
32
and Q
41
represents an oxygen atom, sulfur atom, selenium atom or —N(R)— wherein R represents an alkyl, aryl or heterocyclic group. Each of R
11
, R
12
, R
21
, R
22
, R
31
, R
41
and R
43
represents an aliphatic group; each of R
32
, R
33
and R
42
represents an alkyl, aryl or heterocyclic group. Each of R
13
, R
14
, R
15
, R
16
, R
17
, R
23
, R
24
, R
25
, R
26
, R
27
, R
28
, R
29
, R
34
, R
35
, R
36
, R
37
, R
38
, R
39
, R
44
, R
45
, R
46
, R
47
, R
48
and R
49
, represents a hydrogen atom, or a non-substituted or substituted alkyl, alkoxy, aryloxy, aryl, —N(W
1
, W
2
), —SR or heterocyclic group, R represents an alkyl, aryl or heterocyclic group here; each of W
1
and W
2
represents a non-substituted or substituted alkyl or aryl group, or W
1
and W
2
can form nitrogen-containing heterocycle of 5 member or 6 member by bonding with mutually; each couple of R
11
and R
13
, R
14
and R
16
, R
17
and R
12
, R
21
and R
23
, R
24
and R
26
, R
25
and R
27
, R
26
and R
28
, R
22
and R
29
, R
31
and R
34
, R
35
and R
37
, R
41
and R
44
, R
45
and R
47
, and R
49
and R
43
can form 5 member or 6 membered-ring by bonding with mutually; each of X
11
, X
21
and X
41
represents an ion necessary to cancel charges in a molecule; each of m
11
, m
21
, and m
41
, represents a number of ion necessary to cancel charges in a molecule. Each of n
11
, n
12
, n
21
, n
22
, n
31
, n
41
and n
42
is 0 or 1, and each of l
31
, l
32
, l
33
, l
41
, l
42
and l
43
is 0 or 1.
 R
21
—(S)
m
—R
22
  Formula (2)
In the formula, each of R
21
and R
22
represents aliphatic group, aromatic group or heterocyclic group. At least one of R
21
and R
22
represents atom group which can form a ring by bonding with (S)m together with. And R
21
and R
22
may be different or same. M represents an integer of 2-6.
Preferable example of the optical sensitizing dye represented by Formula I-a is a compound represented by formula Formula I-e or I-f shown below.
In the formula, each of Y
51
, Y
52
, Y
61
and Y
62
represents oxygen atom, sulfur atom, selenium atom or —(NR
0
)—. R
0
represents aliphatic group. Each of R
51
and R
52
represents an aliphatic group. R
61
represents an aliphatic group or a non-metallic atom group necessary to form a 5 member or 6 member condensed ring by bonding together with R
65
. Each of R
53
and R
54
represents a hydrogen atom, alkyl group, aryl or heterocyclic group. Each of R
55
and R
62
represents a hydrogen atom, alkyl group, aryl group, heterocyclic group, halogen atom, alkoxy group, aryloxy group, alkylthio group, arylthio group or amino group. Each of R
63
and R
64
represents a hydrogen atom, alkyl group or a non-metallic atom group necessary to form a 5 member or 6 member condensed ring by bonding with R
63
and R
64
. R
65
represents a hydrogen atom or simple bond to R
61
. Each o

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