G - Physics – 03 – F
Patent
G - Physics
03
F
96/189, 96/2, 96
G03F 7/075 (2006.01) G03F 7/022 (2006.01)
Patent
CA 1153605
ABSTRACT OF THE DISCLOSURE A negative working presensitized planographic printing plate is provided herein for use in dry planography. The planographic plate includes a base substrate. A photosensitive layer is secured to and over- lies the base substrate, the photosensitive layer having a content of ethanol-soluble component not higher than 20% by weight and containing a photosensitive orthoquinonediazide compound which is a naphthoquinione-1,2- diazide-5-sulfonate of novolaks having a percent esterification in the range of between 35% and 65%; and silicone rubber layer, which is a sparsely cross-linked diorganopolysiloxane overlying the photosensitive layer through a bonding component which is an aminosilane of the formula R R' Si(OR")4-m-n where R is an unsubstituted or monosubstituted amino group group-containing alkyl, R' and R" are each alkyl or aryl, m is 1 or 2 and n is O or 1, m+n being equal to 1 and 2. When the printing plate is exposed through a negative film and is then treated with a developer, the photo- sensitive layer in the exposed image areas is dissolved and the corres- ponding portion of the silicone rubber layer is also easily removed and an image is obtained as an exact reproduction of the negative film. Dampening water is not required when printing is carried out.
338473
Fujita Takashi
Iwamoto Masao
Borden Ladner Gervais Llp
Toray Industries Inc.
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