Laser induced imaging of positive working radiation...

G - Physics – 03 – F

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G03F 7/039 (2006.01) B41C 1/10 (2006.01) B41M 5/36 (2006.01) G03F 7/20 (2006.01)

Patent

CA 2249651

Radiation sensitive lithographic compositions suitable for laser induced imaging, which contain a positive working radiation sensitive compound, an aqueous alkali soluble resin and a relatively large proportion of carbon black. Such compositions, when coated on a metal substrate and imagewise exposed to laser induced infrared radiation form a positive image after development with an aqueous alkaline solution. Exposing is conducted with laser light at a wavelength in the range of from about 800 to about 1100 nm at an energy level of from about 50 to about 250 mJ/cm2.

Divulgation de compositions lithographiques radiosensibles utiles pour l'imagerie induite par laser, contenant un composé de travail radiosensible positif, une résine soluble dans une solution aqueuse alcaline et une proportion relativement importante de noir de carbone. De telles compositions forment une image positive après développement avec une solution alcaline aqueuse, lorsqu'elles sont appliquées sur un substrat métallique et exposées à un rayonnement infrarouge induit par laser. L'exposition est réalisée à l'aide d'un faisceau laser de longueur d'onde située dans la gamme allant d'environ 800 à environ 1 100 nm et d'énergie située entre environ 50 et environ 250 mJ/cm2.

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