G - Physics – 03 – F
Patent
G - Physics
03
F
G03F 7/00 (2006.01) G03F 7/075 (2006.01)
Patent
CA 2150689
The present invention relates to a water-less lithographic raw plate, in which a photosensitive layer and a silicone rubber layer are laminated in this order on a substrate, comprising: the peel bonding strength between the photosensitive layer and the silicone rubber layer being 5 to 100 g/cm, and the initial elastic modulus of the photosensitive layer after completion of exposure being 5 to 75 kgf/mm2. In the present invention, attention is paid to the peel bonding strength between the photosensitive layer and the silicone rubber layer before exposure, and it is intensified, while the photosensitive layer after completion of exposure is kept lower in elastic modulus, to provide a water-less lithographic printing plate excellent in printing durability and image reproducibility. Therefore, the water-less lithographic printing plate obtained is suitable for commercial web offset printing and newspaper web offset printing.
Une plaque lithographique anhydre s'obtient par contrecollage séquentiel d'une couche photosensible et d'une couche de caoutchouc siliconée sur un substrat. L'adhérence entre la couche photosensible et la couche de caoutchouc siliconée est de 5 à 100 g/cm, et le module élastique initial de la couche photosensible après exposition est de 5 à 75 kgf/mm<2>. La présente invention accorde une attention particulière à l'adhérence entre la couche photosensible et la couche de caoutchouc siliconée avant exposition. L'augmentation de l'adhérence et la diminution du module élastique de la couche photosensible exposée permettent de réduire l'usure de la plaque et d'améliorer la reproductibilité de l'image. En conséquence, la présente invention permet d'obtenir une plaque lithographique anhydre pour rotative offset et rotative à journal du commerce.
Ikeda Norimasa
Kawamura Ken
Tsuda Mikio
Smart & Biggar
Toray Industries Inc.
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