Radiation imagery chemistry: process – composition – or product th – Silver halide colloid tanning process – composition – or product
Reexamination Certificate
1999-12-14
2002-03-26
Le, Hoa Van (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Silver halide colloid tanning process, composition, or product
Reexamination Certificate
active
06361919
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a novel hydrazine compound, silver halide photographic photosensitive material containing it and an image forming method, in particular a novel hydrazine compound, silver halide photographic photosensitive material containing it for graphic arts and an image forming.
BACKGROUND OF THE INVENTION
The graphic includes process of production to convert original image of continuous gradation into dot image. The technology such as to reproduce an ultra contrast image (&ggr; of 10 or more) is expected in this process, and film for graphic arts employing infectious development of hydrazine compound broadly practiced. In late years high performance such as high sensitivity, low pH developing suitability, reductone developing suitability in response to output films employed in an image setter having oscillating wavelengths of 600 to 800. Developer composition having pH of 10.4 or developer composition employing reductone developing agent such as ascorbic acid and erythorbic acid becomes spreading from the viewpoint of environment suitability broadly, but, the conventional silver halide photographic photosensitive material using hydrazine compound has disadvantage such that the sensitivity and gamma extremely fall down and fog of pepper spots occurs employed in combination with these developer compositions.
SUMMARY OF THE INVENTION
An object of the present invention to provide a hydrazine compound having high activity, and, by employing it, a silver halide photographic photosensitive material by which enough sensitivity and contrast and difficult to occur fog of pepper spots are obtained when the developer composition of lower pH or the developer composition containing the reductone as a developing agent are used, and image forming method thereof.
The above object of the present invention is achieved by the following method.
1. A hydrazine compound which is characterized by comprising at least one alkyl group which has no atom other than carbon and hydrogen atoms, has three or more branches, and does not bond to aromatic ring directly.
2. The hydrazine compound described in above mentioned item 1 wherein total number of carbon atoms of the alkyl group is 6 to 10.
3. The hydrazine compound described in above mentioned item 1 wherein the alkyl group is 2,4,4-trimethylpentyl group.
4. The hydrazine compound represented by the following formula (1).
In the formula R
1
is a group containing at least one alkyl group which has no atom other than carbon, has three or more branches, and does not bond to aromatic ring directly; n is an integer of 0 to 3; Ar is an aromatic group, A
1
and A
2
are both are hydrogen atom or one of them is a hydrogen atom and the other is an alkylsulfonyl or acyl group; R
2
represents alkyl group, aryl group, heteroaryl group, alkenyl group, alkoxy group or amino group; and G is —(CO)p— group, sulfonyl group, sulfoxy group, —P(═O)R
3
— group or iminomethylene group, p is an integer of 1 or 2, R
3
is alkyl group, alkenyl group, alkynyl group, aryl, alkoxy group, alkenyloxy group, alkynyloxy group, aryloxy group or amino group.
5. The hydrazine compound described in above mentioned item 4 wherein total number of carbon atoms of the alkyl group in the formula (1) is 6 to 10.
6. The hydrazine compound described in above mentioned item 4 wherein the alkyl group a formula (1) is 2,4,4-trimethylpentyl group.
7. The hydrazine compound described in above mentioned item 4 to 6 wherein R
2
of a formula (1) is trifluoromethyl group.
8. A hydrazine compound represented by the following formula (2).
In the formula R
1
, n, A
1
, A
2
, G and R
2
are the same meaning as R
1
, n, A
1
, A
2
, G and R
2
in the formula (1) respectively. X
1
and X
2
represent a hydrogen atom or a group which can be substituted for benzene ring. m and 1 each represents an integer of 0 to 4, with proviso m+n<5.
9. The hydrazine compound described in above mentioned item 8 wherein total number of carbon atoms of the alkyl group which R
1
has in the formula (2) is 6 to 10.
10. The hydrazine compound described in above mentioned item 8 wherein the alkyl group which R
1
has in the formula (2) is 2,4,4-trimethylpentyl group.
11. The hydrazine compound described in above mentioned item 8 wherein the alkyl group which R
1
has in the formula (2) is trifluoromethyl group.
12. A silver halide photographic photosensitive material which comprises at least one kind of hydrazine compound describing in claims
1
to
11
.
13. A silver halide photographic photosensitive material which comprises at least one kind of hydrazine compound describing in claims
1
to
11
and at least of hydrazine compound the following formula (3).
In the formula R
3
represents a group containing at least one two-valent sulfur atom. n is an integer of 0 to 3. Ar, A
1
, A
2
, G and R
2
are the same meaning as Ar, A
1
, A
2
, G and R
2
in the formula (1) respectively.
14. The silver halide photographic photosensitive material described in above mentioned item 13 wherein R
3
in the formula (3) is a group containing alkylthio group having 8 or less carbon atoms.
15. Silver halide photographic photosensitive material described in above mentioned item 13 or 14 wherein R
3
in the formula (3) is trifluoromethyl group.
16. Image forming method which forms an image by developing process at least one of the silver halide photographic photosensitive material described in claim
12
to
15
after exposing by using laser light source, and a picture is formed of silver halide photographic photosensitive material described in item 12 to 15.
17. An image forming method described in above mentioned item 16 wherein the developer composition employed in the developing process containing a developing agent represented by formula (A).
In the formula R
4
and R
5
each represents an alkyl group, amino group, alkoxy group or alkylthio group, R
4
and R
5
may form ring by bonding mutually; X represents a carbonyl group or thiocarbonyl group, k represents 0 or 1. M
1
and M
2
each represent a hydrogen atom or an alkali metal.
18. The image forming method described in above-mentioned item 16 or 17 wherein pH of the developer composition employed in the developing processing is 7.5 to 10.
DETAILED DESCRIPTION OF THE INVENTION
The invention is described in detail below.
The hydrazine compound of the invention is described at first.
In counting number of the branches which the alkyl group has appeared in the term of “three or more branches” in the “alkyl group which has no atom other than carbon, has three or more branches, and does not bond to aromatic ring directly” in claims in the present invention, the alkyl group has a branch for a secondary carbon atom and two branches for a tertiary carbon atom, and the total numbers of branches are summed up.
In the present invention, the “alkyl group which has no atom other than carbon, has three or more branches, and does not bond to aromatic ring directly” are mentioned preferably, for example, as the following groups.
Number of
Branches
(R-1)
3
(R-2)
3
(R-3)
3
(R-4)
3
(R-5)
3
(R-6)
3
(R-7)
3
(R-8)
3
(R-9)
3
(R-10)
4
(R-11)
5
(R-12)
4
(R-13)
6
(R-14)
3
(R-15)
4
(R-16)
3
(R-17)
3
(R-18)
4
(R-19)
3
(R-20)
4
Preferably, among the above groups, the number of carbon atom is 6 to 10, and in particular preferably, the number of carbon atom is 8, and most preferable is 2,4,4-trimethyl pentyl group represented by (R-1).
Next the hydrazine compound represented by a formula (1) is described.
In a formula mentioned above (1), the group represented by R
1
is preferably a group exemplified below, each of which comprises an alkyl group as a part of the group, and the alkyl group does not contain constructing atom except carbon and hydrogen and have three or more branches. The examples of the group include amino group, acyl group, alkoxycarbonyl group, aryloxy carbonyl group, acylamino-group, alkoxycarbonylamino group, aryloxy carbonylamino group, sulfonyl amino
Fukusaka Kiyoshi
Matsuura Mitsunori
Miura Norio
Bierman, Muserlian and Lucas
Konica Corporation
Le Hoa Van
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