Radiation imagery chemistry: process – composition – or product th – Transfer procedure between image and image layer – image... – Diffusion transfer process – element – or identified image...
Reexamination Certificate
2002-03-12
2004-01-06
Schilling, Richard L. (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Transfer procedure between image and image layer, image...
Diffusion transfer process, element, or identified image...
C430S204000, C430S230000, C430S264000, C430S598000, C430S619000
Reexamination Certificate
active
06673508
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a planographic printing plate material to which a photothermographic material employing an organic silver salt is applied, and a method of preparing a printing plate therefrom.
BACKGROUND OF THE INVENTION
A method of preparing a printing plate is known which comprises the steps of exposing a planographic printing plate material without an original and developing the exposed material. Of these, a planographic printing plate material prepared according to a silver complex diffusion transfer process (DTR) is well known, in which silver images formed are employed as ink receptive portions. There are, for example, a planographic printing plate material comprising a support and provided thereon, a silver halide emulsion layer, and a physical developing nucleus layer in that order as disclosed in Japanese Patent Publication No. 48-30562, and Japanese Patent O.P.I. Publication Nos. 53-9603, 53-21602, 54-103104 and 56-9750, and a planographic printing plate material comprising an aluminum plate having thereon a physical developing nucleus layer and a silver halide emulsion layer on the nucleus layer as disclosed in Japanese Patent O.P.I. Publication Nos. 5-216236, and 6-81194.
However, these planographic printing plate materials are processed with a liquid such as a developing solution, which produces waste liquid, and disposal of the waste liquid is time-consuming and increases cost. There is, further, the problem that a processor used stains.
As a method in which liquid waste is not produced, there is a method as disclosed in Japanese Patent O.P.I. Publication No. 11-84669 in which thermal development is carried out without employing a developing solution. Such a thermal development has defects in that provide poor printing reproduction of images such as small dots or thin lines.
SUMMARY OF THE INVENTION
In view of the above, the present invention has been made. An object of the invention is to provide a planographic printing plate material employing a thermal development process without producing a liquid waste, and providing excellent printing reproduction and a preparing method thereof.
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patent: 11/084669 (1999-03-01), None
JPAB abstract of JP11/084669A; Mar. 1999.*
Derwent Abstr. of JP 11/084669, Mar. 1999.
Konica Corporation
Muserlian Lucas and Mercanti
Schilling Richard L.
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