Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Reexamination Certificate
2001-06-21
2003-06-24
Chea, Thorl (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
C430S531000, C430S607000, C430S610000, C430S620000, C430S635000
Reexamination Certificate
active
06582897
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a heat developable light-sensitive material, and more particularly to a heat developable light-sensitive material high in heat development activity, excellent in image keeping quality, high in sensitivity and rapidly developable.
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 viewpoint of space saving. Accordingly, techniques relating to heat developable light-sensitive 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 black images having high resolution and sharpness. Such heat developable light-sensitive materials can dispense with the use of processing chemicals of the solution system, so that it becomes possible to 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 viewpoint 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, there is no satisfactory system as an output system of medical images.
On the other hand, methods for forming images by heat development 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) Such heat developable light-sensitive materials generally have light-sensitive layers in which reducible silver salts (for example, organic silver salts), catalytic active amounts of photocatalysts (for example, silver halides), reducing agents, and optionally color toning agents for controlling a color tone of silver are dispersed in binder matrixes. After imagewise exposure, the heat developable light-sensitive materials are heated to a high temperature (or example, 80° C. or more) to produce silver through 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 formed by exposure. Silver formed by the reaction of the reducible silver salts in exposed regions becomes black, and is contrasted with unexposed regions to form images. These techniques 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”).
In recent years, the heat developable light-sensitive materials have been regarded as important in that they require no processing agents and do not discharge waste materials in large amounts, and have spread widely in the market as excellent systems reduced in a load to the environment. The demand for the heat developable light-sensitive materials has increased therewith, and a further improvement in a development processing amount has been desired. It is necessary therefor to increase the rate of development, so that reducing agents and development accelerators having higher activity have been desired. However, in the heat developable light-sensitive materials, elements necessary for image formation are left even after heat development. Accordingly, an increase in development activity results in deterioration of image keeping quality. It has been therefore a most important problem that heat development activity is allowed to be compatible with image keeping quality.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a heat developable light-sensitive material high in heat development activity, excellent in image keeping quality, high in sensitivity and rapidly developable.
As a result of intensive studies for solving the above-mentioned problem, the present inventors have discovered that a heat developable light-sensitive material of the invention is high in heat development activity, excellent in image keeping quality, high in sensitivity and rapidly developable, the material comprising a support having provided on one side thereof a light-sensitive silver halide, a light-insensitive organic silver salt, a reducing agent for a silver ion and a binder, wherein the reducing agent is a compound represented by the following formula (I), and an aromatic carboxylic acid compound represented by the following formula (A) and a hydrogen bonding compound are further provided on the same side where the light-sensitive silver halide is provided,
wherein R
11
and R
11
′ each independently represents an alkyl group; R
12
and R
12
′ each independently represents a hydrogen atom or a group substitutable to a benzene ring; X
11
and X
11
′ each independently represents a hydrogen atom or a group substitutable to a benzene ring; R
11
and X
11
, R
11
′ and X
11
′, R
12
and X, and R
12
′ and X
11
′ may each combine with each other to form a ring; L represents a —S— group or a —CHR
13
-group; and R
13
represents a hydrogen atom or an alkyl group,
wherein R
1
, R
2
, R
3
, R
4
and R
5
each independently represents a hydrogen atom or a group substitutable to a benzene ring; and at least one of R
1
, R
2
, R
3
, R
4
and R
5
represents an undissociative substituent group linked by a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom or a phosphorus atom to a benzene ring.
The hydrogen bonding compound used in the heat developable light-sensitive material of the invention is preferably a compound represented by the following formula (II):
wherein R
21
, R
22
and R
23
, which may be unsubstituted or substituted, each independently represents an alkyl group, an aryl group, an alkoxyl group, an aryloxy group, an amino group or a heterocyclic group; and any two of R
21
, R
22
and R
23
may combine with each other to form a ring.
In the compound represented by formula (A), preferably used is a compound in which at least one of R
1
, R
2
, R
3
, R
4
and R
5
is any one of an alkoxyl group, an aryloxy group, an acyloxy group, an alkylsulfonyloxy group, an arylsulfonyloxy group, an acyl group, an alkoxycarbonyl group and aryloxycarbonyl group.
In the compound represented by formula (I) preferably used is a compound in which R
11
and R
11
′ are each independently a secondary or tertiary alkyl group, R
12
and R
12
′ are each independently an alkyl group, L is a —S— group or a —CHR
13
group, wherein R
13
is a hydrogen atom or an alkyl group, and X
11
and X
11
′ are both hydrogen atoms; a compound in which R
11
and R
12
′ are each independently a tertiary alkyl group, R
12
and R
12
′ are each independently an alkyl group, L is a —S— group or a —CHR
13
group, wherein R
13
is an alkyl group; or a compound in which R
11
and R
11
are each independently a tertiary alkyl group, R
12
and R
12
are each independently an alkyl group having two or more carbon atoms, L is a —S— group or a —CHR
13
group, wherein R
13
is a hydrogen atom.
The binder used in the heat developable light-sensitive material of the invention is preferably an aqueous latex, and the average glass transition temperature thereof is preferably from 20° C. to 60° C.
DETAILED DESCRIPTION OF THE INVENTION
The heat developable light-sensitive material of the invention will be described in detail below.
The heat developable light-sensitive material of the invention comprises a support having provided on one side thereof a light-sensitive silver
Chea Thorl
Fuji Photo Film Co. , Ltd.
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