Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Reexamination Certificate
1999-09-20
2001-02-20
Chea, Thorl (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
C430S619000, C430S631000
Reexamination Certificate
active
06190854
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a thermally developable material with excellent transferability and excellent stability over passage of time, as well as stable developability, specifically to a black and white thermally developable photosensitive material.
BACKGROUND OF THE INVENTION
Conventionally, in the medical field, processing solution waste generated along with the wet process for image forming materials has caused problems regarding worakability, and in recent years, a decrease in the processing solution waste has been strongly demanded in terms of environmental protection and space savings. Thus, a technique for light heat photographic material for a technical photographic use is demanded in which exposure can be sufficiently carried out using a laser image setter or a laser imager, so that sharp and bright images with high resolving power can be achieved. Methods are well known such techniques which are described, for example, 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), etc. These photosensitive materials are referred to as thermally developable photosensitive materials comprising a support having thereon an organic silver salt, a photosensitive silver halide, and a reducing agent. It is well known that an automatic processor for said thermally developable materials is advantageous in that it does not need relatively large scale processing tanks which are employed in most wet processes, but needs only a compact scale of the normal processing apparatus.
SUMMARY OF THE INVENTION
In recent years, in the medical field, such as that data obtained by photographing with a digital apparatus as a CT (Computed Tomography) image and a MRI (Magnetic Resonance Imaging) image are output, employing an imager, on a film which is processed in conventional photographic processing and the thus processed film is used for medical diagnosis. The use of the above-mentioned thermally developable material for the output of the imager exhibits some advantages such as space saving in placement of processing apparatus, ease in processing operation, and environmental protection. However, since said thermally developable material is usually processed at a high temperature of 120° C. or more, there are some problems, detailed below,
(i) transportation failure occasionally occurs when said thermally developable material is thermally developed with an automatic processor having a thermally developing portion;
(ii) marked density variation is often observed after developing a thermally developable material, especially when an unexposed thermally developable material is preserved over a long period of time;
(iii) photographic characteristics such as sensitivity, fogging and the like vary to a great extent, when thermally developable conditions vary, specifically when processing temperature is low.
In view of the foregoing statements, the present invention has been accomplished. An object of the present invention is to provide a thermally developable material with less transportation failure in processing said thermally developable material in an automatic processor, with less density variation after the thermal developing process, and further, with less variation of sensitivity and fogging independent of the processing temperature.
The following two items are very important in the present invention to attain the object the present invention.
(Item 1) A thermally developable material comprising a support having thereon at least a photosensitive layer containing photosensitive silver halide grains and organic silver grains, and said thermally developable material further containing a reducing agent in a photographic component layer provided on a photosensitive layer side,
wherein a smooster value on the surface of an outermost layer provided on said photosensitive layer side is not more than 40 mm Hg, and said photographic component layer provided on said photosensitive layer side contains a fluorine containing surfactant.
(Item 2) A thermally developable material comprising a support having thereon at least a photosensitive layer containing photosensitive silver halide grains and organic silver grains, and said thermally developable material further containing a reducing agent in a photographic component layer provided on a photosensitive layer side,
wherein a smooster value on the surface of an outermost layer provided opposite to said photosensitive layer, with a support between, is not less than 80 mm Hg, and a photographic component layer provided opposite to said photosensitive layer, with a support between, contains a fluorine containing surfactant.
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Bierman Jordan B.
Bierman, Muserlian and Lucas
Chea Thorl
Konica Corporation
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