Heat-developable photosensitive material

Details Heat-developable photosensitive material Heat-developable photosensitive material

1999-09-30

2001-12-11

Chea, Thorl (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

C430S611000

Reexamination Certificate

active

06329134

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a heat-developable photosensitive material. More specifically, the present invention relates to an ultrahigh contrast heat-developable photosensitive material which causes almost no fog (extremely low Dmin) and is suitable for use in photomechanical reproduction requiring low Dmin.
BACKGROUND OF THE INVENTION
A large number of photosensitive materials are known which have a photosensitive layer on a support and form an image by imagewise exposure. An example of a system that enables environmental conservation or simplification of image formation includes a technique of forming an image by heat development.
In recent years, the reduction of amount of waste processing solutions is strongly desired in the field of photomechanical processes from the standpoint of environmental protection and space savings. Techniques relating to photosensitive heat-developable materials for use in photomechanical processes are required which enables efficient exposure by a laser scanner or a laser image setter and formation of a clear black image having high resolution and sharpness. The photosensitive heat-developable materials can provide users with a simple and non-polluting heat development processing system that eliminates the use of solution-type processing chemicals.
Methods for forming an image by heat development are described, for example, in U.S. Pat. Nos. 3,152,904 and 3,457,075 and D. Morgan and B. Shely, Imaging Processes and Materials, “Thermally Processed Silver Systems” A, 8th ed., page 2, compiled by Sturge, V. Walworth and A. Shepp, Neblette (1969). The photosensitive material contains a reducible light-insensitive silver source (e.g., organic silver salt), a photocatalyst (e.g., silver halide) in a catalytically active amount, and a reducing agent for silver, which are usually dispersed in an organic binder matrix. This photosensitive material is stable at an ambient temperature, but when the material is heated at a high temperature (e.g., 80° C. or higher) after light exposure, silver is produced through an oxidation-reduction reaction between the reducible silver source (which functions as an oxidizing agent) and the reducing agent. The oxidation-reduction re action is accelerated by catalytic action of a latent image generated upon exposure. The silver produced by the reaction of the reducible silver salt in the exposure region provides a black image and this presents a contrast to the non-exposure region to form an image.
Fog is a serious problem for heat-developable photosensitive materials. Various researches have been made to reduce the fog in silver halide photosensitive materials for thermal photography. For example, U.S. Pat. No. 3,589,903 discloses use of mercury salts. Furthermore, there have also been disclosed uses of carboxylic acids such as benzoic acid and phthalic acid (U.S. Pat. No. 4,152,160), benzoyl benzoic acid compounds (U.S. Pat. No. 4,784,939), indane or tetralincarboxylic acids (U.S. Pat. No. 4,569,906), dicarboxylic acids (U.S. Pat. No. 4,820,617), heteroaromatic carboxylic acids (U.S. Pat. No. 4,626,500), palladium compounds (U.S. Pat. No. 4,103,312 and British Patent No. 1,502,670), iron family compounds (U.S. Pat. No. 4,128,428), substituted triazoles (U.S. Pat. Nos. 4,123,374, 4,129,557 and 4,125,430), sulfur compounds (U.S. Pat. Nos. 4,213,784, 4,245,033, and JP-A-51-26019 [the abbreviation “JP-A” as used herein means an “unexamined published Japanese patent application”]), thiouracils (U.S. Pat. No.4,002,479), sulfinic acid (JP-A-50-123331), metal salts of thiosulfonic acid (U.S. Pat. Nos. 4,125,403, 4,152,160 and 4,307,187), combinations of metal salts of thiosulfonic acid and sulfinic acid (JP-A-53-20923 and JP-A-53-19825), thiosulfonic acid esters (JP-B-62-50810 [the abbreviation “JP-B” as used herein means an “examined Japanese patent publication”], JP-A-7-209797 and JP-A-9-43760), and disulphide compounds (JP-A-51-42529 and JP-B-63-37368).
Furthermore, there have also been disclosed uses of halogenated compounds (JP-B-54-165, European Patent Nos. 605981A, 631176A, U.S. Pat. Nos. 4,546,075, 4,756,999, 4,452,885, 3,874,946 and 3,955,982), and halogen molecules and halogen atoms bound to hetero rings (U.S. Pat. No. 5,028,523).
However, those compounds have drawbacks, for example, insufficient anti-fog effect, decrease of Dmax at a larger addition amount, degraded image storage stability after development and the like. In addition, they may cause a problem that they volatilize out of the photosensitive materials during heat-development and adversely affect human bodies. Therefore, it has been desired to develop an antifoggant free from these problems.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a heat-developable photosensitive material with extremely low fog, and also to provide a heat-developable photosensitive material with almost no volatility which causes no adverse effect on environment and human bodies.
The aforementioned object was achieved by the present invention. The present invention thus provides a heat-developable photosensitive material which comprises, on at least one of the surfaces of a support, (a) a photosensitive silver halide, (b) a reducible silver salt, (c) a reducing agent, (d) an ultrahigh contrast agent, (e) a binder, and (f) at least one compound represented by the following formula (1) on a single surface:
wherein, X represents a halogen atom; R
1
represents a substituted aryl group or a heterocyclic group; R
2
represents a functional group; r is an integer of from 0 to 4; and when r≧2, plural groups represented by R
2
may be the same or different and they may bind to each other to form a 5- to 7-membered non-aromatic or aromatic carbon ring.
According to preferred embodiments of the aforementioned invention, there are provided the aforementioned heat-developable photosensitive material, wherein R
1
is a substituted aryl group; the aforementioned heat-developable photosensitive material, wherein R
2
is a group selected from the group consisting of an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an alkoxyl group, an alkoxycarbonyl group, a sulfamoyl group, a carbamoyl group, a sulfonyl group, a halogen atom, cyano group, sulfo group, or carboxyl group, more preferably, an alkyl group, an alkenyl group, a sulfonyl group, a sulfamoyl group, an alkoxyl group, a halogen atom, sulfo group, and carboxyl group; the aforementioned heat-developable photosensitive material, wherein R
2
is an alkyl group; the aforementioned heat-developable photosensitive material, wherein the group represented by R
1
SO
2
— is substituted at para-position relative to the group represented by SO
2
CX
3
; and the aforementioned heat-developable photosensitive material, wherein X is bromine atom.
According to further preferred embodiment of the present invention, there are provided: the aforementioned heat-developable photosensitive material, wherein the compound represented by the formula (1) is a compound represented by the following formula (1-a):
wherein, R
3
and R
4
independently represent a functional group; m
1
is an integer of from 1 to 5 and when m
1
≧2, plural groups represented by R
3
may be the same or different; and n
1
is an integer of from 0 to 4 and when n
1
≧2, plural groups represented by R
4
may be the same or different and they may bind to each other to form a 5- to 7-membered non-aromatic or aromatic carbon ring; and
the aforementioned heat-developable photosensitive material, wherein the compound represented by the formula (1) is a compound represented by the following formula (1-b):
wherein R
5
represents a straight, branched, or cyclic alkyl group; and p is an integer of from 1 to 5 and when p≧2, plural groups represented by R
5
may be the same or different and they may bind to each other to form a 5- to 7-membered non-aromatic or aromatic carbon ring.
According to still further preferred embodiments, there are provided the aforementioned heat-developable p

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