Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Reexamination Certificate
1999-05-25
2001-06-12
Le, Hoa Van (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
C430S935000, C106S160100, C530S355000
Reexamination Certificate
active
06245500
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method in which a photographic coating composition in a sol state, comprising a photographic emulsion, an emulsified material or gelatin solution, or comprising combinations thereof, is rapidly cooled to a temperature not more than the sol-gel transforming point, employing a transfer-type heat exchange system, and after being transformed into a gel state, the resulting product is placed into a storage vessel, and an apparatus of the same.
BACKGROUND OF THE INVENTION
Regarding techniques for gelling a photographic emulsion in a sol state, an emulsified material in a sol state, etc., methods have been employed in which, as described in Japanese Patent Publication Open to Public Inspection No. 8-95178, prior to being completely transformed into a gel state, those are placed into in a storage vessel, and, as described in Japanese Patent Publication No. 50-31447, Japanese Patent Publication Open to Public Inspection No. 60-104937, and Japanese Patent Publication Nos. 3-5210 and 3-68735, a material in a sol state is transformed to a gel state employing evacuation and heat transfer cooling.
The method is described further in Japanese Patent Publication No. 52-14717.
SUMMARY OF THE INVENTION
As described above, when placed in a storage vessel prior to being transformed into a gel state, the received material adheres to the vessel to adversely affect the handling during the re-melting process, as well as to a markedly lower heat efficiency during melting. Furthermore, in the method in which a material in a sol state is transformed into a gel state employing reduced pressure and heat transfer cooling, it has been difficult to constantly control the water content at a specific value, and it has been troublesome to readjust the silver amount through the addition of water after re-melting.
Furthermore, a coating compositions comprising a photographic emulsion in a sol state, an emulsified material, gelatin, etc. has been concentrated in order to enhance the rate of production without varying the coating and drying capacity. Such a coating composition is set (or gelled) employing vacuum setting, a heat transfer transmission system, etc. Thereafter, the coating composition comprising the photographic emulsion in a sol state, an emulsified material, gelatin, etc. was placed in a pot and stored in a refrigerator. When applied, the required amount of the composition is shredded employing a cutter, re-melted, and prepared in a tank. However, the cutting properties (shredding properties) are degraded due to changes in physical properties of a set composition (gelled composition) which has been concentrated, and at the same time, the adhesion to the vessel is increased. Thus, the productivity and product quality have been markedly deteriorated. In this connection, however, in order to achieve high speed coating, the concentration of the coating composition has been an inevitable condition.
Further, because during melting of the set composition (gelled composition), which has been concentrated, any amount of water results in a decrease, and therefore melting or preparing time has been prolonged, which adversely affect coating composition stability.
An object of the present invention is to solve problems described above, and to provide a method for gelling any composition comprising a photographic emulsion, an emulsified material, or gelatin solution, or comprising combinations thereof.
The method of the invention and embodiment thereof are described.
A method for gelling a photographic coating composition comprising steps of;
cooling continuously a photographic coating composition in a sol state containing a photographic emulsion, an emulsified material or gelatin solution, or containing combinations thereof into gel state, and
receiving the photographic coating composition in a gel state in a storage vessel.
In the method mentioned above, the photographic coating composition is cooled while the photographic coating composition in a sol state flows.
In the method mentioned above, the photographic coating composition in a sol state is cooled to a temperature not more than the sol-gel transforming point while the photographic coating composition in a sol state flows.
In the method mentioned above, the photographic coating composition in a sol state is cooled by employing a transfer-type heat exchange system.
In the method mentioned above, the photographic coating composition in a sol state is cooled rapidly to a temperature not more than the sol-gel transforming point.
In the method mentioned above, the photographic coating composition in a sol state is cooled by a heat exchanger and the passing time of the composition through the heat exchanger and a tubing from the heat exchanger to a storage vessel is not shorter than that for the sol-gel transformation.
In the method mentioned above, sum of volume of the heat exchanger and a tubing from the heat exchanger to a storage vessel is determined so that the passing time of the composition through the heat exchanger and a tubing from the heat exchanger to the storage vessel is not shorter than that for sol-gel transformation.
In the method mentioned above, the photographic coating composition in a sol state is cooled at cooling zone provided between the heat exchanger and the storage vessel, and after gelling at least the surface, the composition is placed into the storage vessel.
In the method mentioned above, the photographic coating composition in a sol state is cooled so that the photographic coating composition is transformed into a gel state whereby the photographic coating composition becomes in noodle shape.
In the method mentioned above, the photographic coating composition in a gel state is received in the vessel in noodle shape.
In the method mentioned above, the photographic coating composition in a gel state is passed through a noodler which reduces the diameter of the cross section at right angles to the longitudinal direction of photographic coating composition in a gel state.
In the method mentioned above, the photographic coating composition is passed through tubing after cooling, and
the photographic coating composition in a gel state is passed through a noodler thereafter.
In the method mentioned above, the maximum diameter of the cross section at right angles to the longitudinal direction of photographic coating composition in a gel state is between 1 and 10 mm.
In the method mentioned above, the above-mentioned gelled composition in noodle shape is cut into an appropriate size, and is placed into the storage vessel.
In the method mentioned above, the appropriate size has a ratio of volume/surface area of 0.02 to 0.3 cm.
In the method mentioned above, the photographic coating composition in a sol state is cooled under such condition that the photographic coating composition in a noodle state is cut into an appropriate size.
In the method mentioned above, the photographic coating composition in a sol state is cooled under such condition that the photographic coating composition in a noodle state is cut into an appropriate size.
In the method mentioned above, the photographic coating composition in a sol state is cooled under such condition that the photographic coating composition in a noodle state is cut into an appropriate size by weight of noodle by itself.
In the method mentioned above, the photographic coating composition in a sol state is cooled by employing a scraped surface heat exchanger.
In the method mentioned above, viscoelasticity of the photographic coating composition in a gel state just before passing the tubing is greater than that just before placing into the noodler.
REFERENCES:
patent: 3396027 (1968-08-01), McFall et al.
patent: 4307055 (1981-12-01), Takeda et al.
patent: 5665531 (1997-09-01), Mutoh et al.
Bierman Jordan B.
Bierman, Muserlian and Lucas
Konica Corporation
Le Hoa Van
Walke Amanda C.
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