Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making
Patent
1997-10-27
2000-08-01
Baxter, Janet
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
430303, G03F 7004
Patent
active
060964766
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a directly imageable raw plate for waterless planographic printing plate which can be used without using dampening water, and a waterless planographic printing plate obtained by selectively forming an image on the directly imageable raw plate for waterless planographic printing plate and developing it. In more detail, it relates to a directly imageable raw plate for waterless planographic printing plate remarkably improved in printing durability and developability, and a waterless planographic printing plate obtained by selectively and directly forming an image on the directly imageable raw plate for waterless planographic printing plate by a laser beam and developing it.
BACKGROUND ARTS
Making a planographic printing plate using silicone rubber or fluorine resin as the ink repellent layer without using dampening water, especially direct plate making which makes an offset printing plate without using any film for plate making has been used in the short run printing industry, and begins to be used also in the areas of offset printing and gravure printing because of such features as simplicity not requiring any high skill, speediness to allow a printing plate to be obtained in a short time, rationality to allow a system optimum in view of desired quality and cost to be selected among diverse systems. Especially recently in the rapid progress of output systems such as prepress systems, image setters and laser printers, new types of various planographic printing plates have been developed. The methods for making these planographic printing plates can be classified into methods of irradiating with a laser beam, methods of writing by a thermal head, methods of selectively applying voltages by pin electrodes, methods of forming an ink repellent layer or inking layer by ink jet, etc.
Among them, the methods of using a laser beam are more excellent than other methods in view of resolution and plate making speed.
For example, as directly imageable raw plate for waterless planographic printing plates, JP-B-42-21879, U.S. Pat. Nos. 4,519,40, 5,339,739 (6,243,1), 1,253,19, 5,928,3, etc. propose directly imageable raw plate for waterless planographic printing plates in which a heat sensitive layer containing an infrared absorbing material and a self oxidizing material and an ink repellent silicone rubber layer are laminated on a substrate. Furthermore, U.S. Pat. No. 2,470,14 proposes a directly imageable raw plate for waterless planographic printing plate in which a heat sensitive layer and an ink repellent silicone rubber layer are laminated on a substrate. However, in these directly imageable raw plate for waterless planographic printing plates, since the heat sensitive layer is hard and fragile, the stress acting on the plate surface during offset printing acts intensively at the interface between the heat sensitive layer and the silicone rubber layer, to cause adhesion rupture. Furthermore, the heat sensitive layer is likely to be damaged, and according to the increase of printed sheets, the heat sensitive layer below the ink repellent layer is damaged in the non-image area, and this phenomenon erodes the ink repellent layer, to lower image reproducibility disadvantageously. As a result, the printing durability of the printing plate becomes insufficient disadvantageously. Studies have been made for the purpose of improving the printing durability. U.S. Pat. No. 2,470,16 proposes a plate in which a silicone rubber layer is anchored by an adhesion accelerator such as a silane coupling agent, and according to this proposal, though the adhesiveness to the heat sensitive layer is improved, practically sufficient printing durability cannot be obtained. Thickening the ink repellent layer has also been attempted, but the decline of sensitivity caused by thickening and the shortening of ink mileage occur disadvantageously. To overcome these problems, various studies have been made for photosensitive waterless planographic printing plates. JP-A-1-161242, JP-A-1-154159, etc.
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Baba Yuzuru
Fujimaru Kouichi
Ichikawa Michihiko
Ikeda Norimasa
Kawamura Ken
Baxter Janet
Gilmore Barbara
Toray Industries Inc.
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