Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Reexamination Certificate
2003-06-10
2004-10-26
Chea, Thorl (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
C430S527000, C430S530000, C430S600000, C430S607000, C430S613000, C430S619000, C430S965000
Reexamination Certificate
active
06808872
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to black-and-white silver salt photothermographic dry imaging materials having superior image quality and exhibiting superior uniformity without unevenness.
BACKGROUND OF THE INVENTION
In the field of graphic arts and medical treatment, there have been concerns in processing of photographic film with respect to effluent produced from wet-processing of image-forming materials, and recently, reduction of the processing effluent is strongly demanded in terms of environmental protection and space saving.
There has been desired a photothermographic material for photographic use, capable of forming distinct black images exhibiting high sharpness, enabling efficient exposure by means of a laser imager or a laser image setter.
Known as such a technique is a silver salt photothermographic dry imaging material which comprises on a support an organic silver salt, light sensitive silver halide grains, and reducing agent, as described in U.S. Pat. Nos. 3,152,904 and 3,487,075, and D. Morgan, “Dry Silver Photographic Materials” (Handbook of Imaging Materials, Marcel Dekker, Inc. page 48, 1991) and JP-A No. 2001-272746 (hereinafter, the term, JP-A refers to Japanese Patent Application Publication). In such photothermographic materials, no solution type processing chemicals is used, providing a simple and environment friendly system to users.
These photothermographic materials, which comprise a photosensitive layer containing light-sensitive silver halide grains as a photosensor and an organic silver salt as a silver source, together with a reducing agent are thermally developed usually at a temperature of 80 to 140° C. to form an image, without being further subjected to fixing.
However, when developed using commonly known apparatuses and methods, the foregoing photothermographic materials often result in non-uniform images. Specifically when continuously processed, such a tendency became marked, producing problems in uneven density. Such defects are permissible in the field applying texts and line images for the most part. However, in the field applying medical, industrial and graphic images, further enhanced levels of uniformity in density and color tone, stability of color tone (i.e., neutralness or natural blackness), and image quality have been desired. In this regard, techniques for enhancing uniformity in processed images, specifically, uniformity in neutral solid images are also disclosed in the foregoing literature.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a silver salt photothermographic dry imaging material (hereinafter, also denoted simply as photothermographic material) exhibiting enhanced image quality and superior uniformity without causing uneven density, an image recording method and image forming method by use thereof, and a preparation method thereof.
The object of the invention can be accomplished by the following constitution:
1. A silver salt photothermographic material comprising on a support a light-sensitive layer comprising a light-sensitive emulsion containing organic silver salt grains and light-sensitive silver halide grains, a reducing agent and a binder and a conductive layer, wherein the conductive layer contains at least one of compounds represented by the following formulas (2a) through (2e):
(Rf
1
)
p
&Parenopenst;Y&Parenclosest;(A
1
)
q
formula (2a)
wherein Rf
1
represents a fluorine-containing substituent group; Y represents a linkage group containing no fluorine atom; A
1
represents an anion group or its salt; p is an integer of 1 to 5 and q is an integer of 1 to 5, provided that A
1
is not SO
3
K when p and q are each 1, Rf
1
is —C
8
F
17
and Y is —CH
2
CH
2
—;
(Rf
2
&Parenclosest;(A
2
)
s
formula (2b)
wherein Rf
2
represents a fluorine-containing group; A
2
represents an anion group or its salt; and s is an integer of 2 to 5;
LiO
3
S&Parenopenst;CF
2
&Parenclosest;
m
SO
3
Li formula (2c)
wherein m is an integer of 1 to 4;
MO
3
S&Parenopenst;CF
2
&Parenclosest;
t
SO
3
M formula (2d)
wherein M represents H, Na, K or an ammonium group; t is a positive integer, provided that when M is H, t is 1 to 6 or 8, when M is Na, t is 4, when M is K, t is 1 to 6, and when M is an ammonium group, t is 1 to 8;
L[O
3
S&Parenopenst;CF
2
&Parenclosest;
u
SO
3
] formula (2e)
wherein L is Ba, Ca or Mg; u is a positive integer, provided that when L is Ba, u is 1 to 5, when L is Ca or Mg, u is 1 to 8;
2. The photothermographic material described above, wherein at least one of the light-sensitive layer and a layer adjacent thereto contains a compound represented by the following formula (1):
wherein R
1
represents an alkyl group; R
2
represents a hydrogen atom, an alkyl group, or an acylamino group, provided that neither R
1
nor R
2
is 2-hydroxyphenylmethyl R
3
represents a hydrogen atom, or an alkyl group; and R
4
represents a substituent group.
REFERENCES:
patent: 6413712 (2002-07-01), Yoshioka et al.
patent: 6548240 (2003-04-01), Yamaguchi
Chea Thorl
Konica Corporation
Muserlian Lucas and Mercanti
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